Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1215 insertions, 0 deletions

diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
new file mode 100644
index 000000000000..d2c3d2fa082e
--- /dev/null
+++ b/drivers/usb/storage/transport.c
@@ -0,0 +1,1215 @@
+/* Driver for USB Mass Storage compliant devices
+ *
+ * $Id: transport.c,v 1.47 2002/04/22 03:39:43 mdharm Exp $
+ *
+ * Current development and maintenance by:
+ *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
+ *
+ * Developed with the assistance of:
+ *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
+ *   (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov)
+ *   (c) 2002 Alan Stern <stern@rowland.org>
+ *
+ * Initial work by:
+ *   (c) 1999 Michael Gee (michael@linuxspecific.com)
+ *
+ * This driver is based on the 'USB Mass Storage Class' document. This
+ * describes in detail the protocol used to communicate with such
+ * devices.  Clearly, the designers had SCSI and ATAPI commands in
+ * mind when they created this document.  The commands are all very
+ * similar to commands in the SCSI-II and ATAPI specifications.
+ *
+ * It is important to note that in a number of cases this class
+ * exhibits class-specific exemptions from the USB specification.
+ * Notably the usage of NAK, STALL and ACK differs from the norm, in
+ * that they are used to communicate wait, failed and OK on commands.
+ *
+ * Also, for certain devices, the interrupt endpoint is used to convey
+ * status of a command.
+ *
+ * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
+ * information about this driver.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+
+#include "usb.h"
+#include "transport.h"
+#include "protocol.h"
+#include "scsiglue.h"
+#include "debug.h"
+
+
+/***********************************************************************
+ * Data transfer routines
+ ***********************************************************************/
+
+/*
+ * This is subtle, so pay attention:
+ * ---------------------------------
+ * We're very concerned about races with a command abort.  Hanging this code
+ * is a sure fire way to hang the kernel.  (Note that this discussion applies
+ * only to transactions resulting from a scsi queued-command, since only
+ * these transactions are subject to a scsi abort.  Other transactions, such
+ * as those occurring during device-specific initialization, must be handled
+ * by a separate code path.)
+ *
+ * The abort function (usb_storage_command_abort() in scsiglue.c) first
+ * sets the machine state and the ABORTING bit in us->flags to prevent
+ * new URBs from being submitted.  It then calls usb_stor_stop_transport()
+ * below, which atomically tests-and-clears the URB_ACTIVE bit in us->flags
+ * to see if the current_urb needs to be stopped.  Likewise, the SG_ACTIVE
+ * bit is tested to see if the current_sg scatter-gather request needs to be
+ * stopped.  The timeout callback routine does much the same thing.
+ *
+ * When a disconnect occurs, the DISCONNECTING bit in us->flags is set to
+ * prevent new URBs from being submitted, and usb_stor_stop_transport() is
+ * called to stop any ongoing requests.
+ *
+ * The submit function first verifies that the submitting is allowed
+ * (neither ABORTING nor DISCONNECTING bits are set) and that the submit
+ * completes without errors, and only then sets the URB_ACTIVE bit.  This
+ * prevents the stop_transport() function from trying to cancel the URB
+ * while the submit call is underway.  Next, the submit function must test
+ * the flags to see if an abort or disconnect occurred during the submission
+ * or before the URB_ACTIVE bit was set.  If so, it's essential to cancel
+ * the URB if it hasn't been cancelled already (i.e., if the URB_ACTIVE bit
+ * is still set).  Either way, the function must then wait for the URB to
+ * finish.  Note that because the URB_ASYNC_UNLINK flag is set, the URB can
+ * still be in progress even after a call to usb_unlink_urb() returns.
+ *
+ * The idea is that (1) once the ABORTING or DISCONNECTING bit is set,
+ * either the stop_transport() function or the submitting function
+ * is guaranteed to call usb_unlink_urb() for an active URB,
+ * and (2) test_and_clear_bit() prevents usb_unlink_urb() from being
+ * called more than once or from being called during usb_submit_urb().
+ */
+
+/* This is the completion handler which will wake us up when an URB
+ * completes.
+ */
+static void usb_stor_blocking_completion(struct urb *urb, struct pt_regs *regs)
+{
+	struct completion *urb_done_ptr = (struct completion *)urb->context;
+
+	complete(urb_done_ptr);
+}
+ 
+/* This is the timeout handler which will cancel an URB when its timeout
+ * expires.
+ */
+static void timeout_handler(unsigned long us_)
+{
+	struct us_data *us = (struct us_data *) us_;
+
+	if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->flags)) {
+		US_DEBUGP("Timeout -- cancelling URB\n");
+		usb_unlink_urb(us->current_urb);
+	}
+}
+
+/* This is the common part of the URB message submission code
+ *
+ * All URBs from the usb-storage driver involved in handling a queued scsi
+ * command _must_ pass through this function (or something like it) for the
+ * abort mechanisms to work properly.
+ */
+static int usb_stor_msg_common(struct us_data *us, int timeout)
+{
+	struct completion urb_done;
+	struct timer_list to_timer;
+	int status;
+
+	/* don't submit URBs during abort/disconnect processing */
+	if (us->flags & ABORTING_OR_DISCONNECTING)
+		return -EIO;
+
+	/* set up data structures for the wakeup system */
+	init_completion(&urb_done);
+
+	/* fill the common fields in the URB */
+	us->current_urb->context = &urb_done;
+	us->current_urb->actual_length = 0;
+	us->current_urb->error_count = 0;
+	us->current_urb->status = 0;
+
+	/* we assume that if transfer_buffer isn't us->iobuf then it
+	 * hasn't been mapped for DMA.  Yes, this is clunky, but it's
+	 * easier than always having the caller tell us whether the
+	 * transfer buffer has already been mapped. */
+	us->current_urb->transfer_flags =
+			URB_ASYNC_UNLINK | URB_NO_SETUP_DMA_MAP;
+	if (us->current_urb->transfer_buffer == us->iobuf)
+		us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+	us->current_urb->transfer_dma = us->iobuf_dma;
+	us->current_urb->setup_dma = us->cr_dma;
+
+	/* submit the URB */
+	status = usb_submit_urb(us->current_urb, GFP_NOIO);
+	if (status) {
+		/* something went wrong */
+		return status;
+	}
+
+	/* since the URB has been submitted successfully, it's now okay
+	 * to cancel it */
+	set_bit(US_FLIDX_URB_ACTIVE, &us->flags);
+
+	/* did an abort/disconnect occur during the submission? */
+	if (us->flags & ABORTING_OR_DISCONNECTING) {
+
+		/* cancel the URB, if it hasn't been cancelled already */
+		if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->flags)) {
+			US_DEBUGP("-- cancelling URB\n");
+			usb_unlink_urb(us->current_urb);
+		}
+	}
+ 
+	/* submit the timeout timer, if a timeout was requested */
+	if (timeout > 0) {
+		init_timer(&to_timer);
+		to_timer.expires = jiffies + timeout;
+		to_timer.function = timeout_handler;
+		to_timer.data = (unsigned long) us;
+		add_timer(&to_timer);
+	}
+
+	/* wait for the completion of the URB */
+	wait_for_completion(&urb_done);
+	clear_bit(US_FLIDX_URB_ACTIVE, &us->flags);
+ 
+	/* clean up the timeout timer */
+	if (timeout > 0)
+		del_timer_sync(&to_timer);
+
+	/* return the URB status */
+	return us->current_urb->status;
+}
+
+/*
+ * Transfer one control message, with timeouts, and allowing early
+ * termination.  Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx.
+ */
+int usb_stor_control_msg(struct us_data *us, unsigned int pipe,
+		 u8 request, u8 requesttype, u16 value, u16 index, 
+		 void *data, u16 size, int timeout)
+{
+	int status;
+
+	US_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n",
+			__FUNCTION__, request, requesttype,
+			value, index, size);
+
+	/* fill in the devrequest structure */
+	us->cr->bRequestType = requesttype;
+	us->cr->bRequest = request;
+	us->cr->wValue = cpu_to_le16(value);
+	us->cr->wIndex = cpu_to_le16(index);
+	us->cr->wLength = cpu_to_le16(size);
+
+	/* fill and submit the URB */
+	usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, 
+			 (unsigned char*) us->cr, data, size, 
+			 usb_stor_blocking_completion, NULL);
+	status = usb_stor_msg_common(us, timeout);
+
+	/* return the actual length of the data transferred if no error */
+	if (status == 0)
+		status = us->current_urb->actual_length;
+	return status;
+}
+
+/* This is a version of usb_clear_halt() that allows early termination and
+ * doesn't read the status from the device -- this is because some devices
+ * crash their internal firmware when the status is requested after a halt.
+ *
+ * A definitive list of these 'bad' devices is too difficult to maintain or
+ * make complete enough to be useful.  This problem was first observed on the
+ * Hagiwara FlashGate DUAL unit.  However, bus traces reveal that neither
+ * MacOS nor Windows checks the status after clearing a halt.
+ *
+ * Since many vendors in this space limit their testing to interoperability
+ * with these two OSes, specification violations like this one are common.
+ */
+int usb_stor_clear_halt(struct us_data *us, unsigned int pipe)
+{
+	int result;
+	int endp = usb_pipeendpoint(pipe);
+
+	if (usb_pipein (pipe))
+		endp |= USB_DIR_IN;
+
+	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
+		USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
+		USB_ENDPOINT_HALT, endp,
+		NULL, 0, 3*HZ);
+
+	/* reset the endpoint toggle */
+	usb_settoggle(us->pusb_dev, usb_pipeendpoint(pipe),
+		usb_pipeout(pipe), 0);
+
+	US_DEBUGP("%s: result = %d\n", __FUNCTION__, result);
+	return result;
+}
+
+
+/*
+ * Interpret the results of a URB transfer
+ *
+ * This function prints appropriate debugging messages, clears halts on
+ * non-control endpoints, and translates the status to the corresponding
+ * USB_STOR_XFER_xxx return code.
+ */
+static int interpret_urb_result(struct us_data *us, unsigned int pipe,
+		unsigned int length, int result, unsigned int partial)
+{
+	US_DEBUGP("Status code %d; transferred %u/%u\n",
+			result, partial, length);
+	switch (result) {
+
+	/* no error code; did we send all the data? */
+	case 0:
+		if (partial != length) {
+			US_DEBUGP("-- short transfer\n");
+			return USB_STOR_XFER_SHORT;
+		}
+
+		US_DEBUGP("-- transfer complete\n");
+		return USB_STOR_XFER_GOOD;
+
+	/* stalled */
+	case -EPIPE:
+		/* for control endpoints, (used by CB[I]) a stall indicates
+		 * a failed command */
+		if (usb_pipecontrol(pipe)) {
+			US_DEBUGP("-- stall on control pipe\n");
+			return USB_STOR_XFER_STALLED;
+		}
+
+		/* for other sorts of endpoint, clear the stall */
+		US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
+		if (usb_stor_clear_halt(us, pipe) < 0)
+			return USB_STOR_XFER_ERROR;
+		return USB_STOR_XFER_STALLED;
+
+	/* timeout or excessively long NAK */
+	case -ETIMEDOUT:
+		US_DEBUGP("-- timeout or NAK\n");
+		return USB_STOR_XFER_ERROR;
+
+	/* babble - the device tried to send more than we wanted to read */
+	case -EOVERFLOW:
+		US_DEBUGP("-- babble\n");
+		return USB_STOR_XFER_LONG;
+
+	/* the transfer was cancelled by abort, disconnect, or timeout */
+	case -ECONNRESET:
+		US_DEBUGP("-- transfer cancelled\n");
+		return USB_STOR_XFER_ERROR;
+
+	/* short scatter-gather read transfer */
+	case -EREMOTEIO:
+		US_DEBUGP("-- short read transfer\n");
+		return USB_STOR_XFER_SHORT;
+
+	/* abort or disconnect in progress */
+	case -EIO:
+		US_DEBUGP("-- abort or disconnect in progress\n");
+		return USB_STOR_XFER_ERROR;
+
+	/* the catch-all error case */
+	default:
+		US_DEBUGP("-- unknown error\n");
+		return USB_STOR_XFER_ERROR;
+	}
+}
+
+/*
+ * Transfer one control message, without timeouts, but allowing early
+ * termination.  Return codes are USB_STOR_XFER_xxx.
+ */
+int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe,
+		u8 request, u8 requesttype, u16 value, u16 index,
+		void *data, u16 size)
+{
+	int result;
+
+	US_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n",
+			__FUNCTION__, request, requesttype,
+			value, index, size);
+
+	/* fill in the devrequest structure */
+	us->cr->bRequestType = requesttype;
+	us->cr->bRequest = request;
+	us->cr->wValue = cpu_to_le16(value);
+	us->cr->wIndex = cpu_to_le16(index);
+	us->cr->wLength = cpu_to_le16(size);
+
+	/* fill and submit the URB */
+	usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, 
+			 (unsigned char*) us->cr, data, size, 
+			 usb_stor_blocking_completion, NULL);
+	result = usb_stor_msg_common(us, 0);
+
+	return interpret_urb_result(us, pipe, size, result,
+			us->current_urb->actual_length);
+}
+
+/*
+ * Receive one interrupt buffer, without timeouts, but allowing early
+ * termination.  Return codes are USB_STOR_XFER_xxx.
+ *
+ * This routine always uses us->recv_intr_pipe as the pipe and
+ * us->ep_bInterval as the interrupt interval.
+ */
+static int usb_stor_intr_transfer(struct us_data *us, void *buf,
+				  unsigned int length)
+{
+	int result;
+	unsigned int pipe = us->recv_intr_pipe;
+	unsigned int maxp;
+
+	US_DEBUGP("%s: xfer %u bytes\n", __FUNCTION__, length);
+
+	/* calculate the max packet size */
+	maxp = usb_maxpacket(us->pusb_dev, pipe, usb_pipeout(pipe));
+	if (maxp > length)
+		maxp = length;
+
+	/* fill and submit the URB */
+	usb_fill_int_urb(us->current_urb, us->pusb_dev, pipe, buf,
+			maxp, usb_stor_blocking_completion, NULL,
+			us->ep_bInterval);
+	result = usb_stor_msg_common(us, 0);
+
+	return interpret_urb_result(us, pipe, length, result,
+			us->current_urb->actual_length);
+}
+
+/*
+ * Transfer one buffer via bulk pipe, without timeouts, but allowing early
+ * termination.  Return codes are USB_STOR_XFER_xxx.  If the bulk pipe
+ * stalls during the transfer, the halt is automatically cleared.
+ */
+int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe,
+	void *buf, unsigned int length, unsigned int *act_len)
+{
+	int result;
+
+	US_DEBUGP("%s: xfer %u bytes\n", __FUNCTION__, length);
+
+	/* fill and submit the URB */
+	usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length,
+		      usb_stor_blocking_completion, NULL);
+	result = usb_stor_msg_common(us, 0);
+
+	/* store the actual length of the data transferred */
+	if (act_len)
+		*act_len = us->current_urb->actual_length;
+	return interpret_urb_result(us, pipe, length, result, 
+			us->current_urb->actual_length);
+}
+
+/*
+ * Transfer a scatter-gather list via bulk transfer
+ *
+ * This function does basically the same thing as usb_stor_bulk_transfer_buf()
+ * above, but it uses the usbcore scatter-gather library.
+ */
+static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe,
+		struct scatterlist *sg, int num_sg, unsigned int length,
+		unsigned int *act_len)
+{
+	int result;
+
+	/* don't submit s-g requests during abort/disconnect processing */
+	if (us->flags & ABORTING_OR_DISCONNECTING)
+		return USB_STOR_XFER_ERROR;
+
+	/* initialize the scatter-gather request block */
+	US_DEBUGP("%s: xfer %u bytes, %d entries\n", __FUNCTION__,
+			length, num_sg);
+	result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0,
+			sg, num_sg, length, SLAB_NOIO);
+	if (result) {
+		US_DEBUGP("usb_sg_init returned %d\n", result);
+		return USB_STOR_XFER_ERROR;
+	}
+
+	/* since the block has been initialized successfully, it's now
+	 * okay to cancel it */
+	set_bit(US_FLIDX_SG_ACTIVE, &us->flags);
+
+	/* did an abort/disconnect occur during the submission? */
+	if (us->flags & ABORTING_OR_DISCONNECTING) {
+
+		/* cancel the request, if it hasn't been cancelled already */
+		if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->flags)) {
+			US_DEBUGP("-- cancelling sg request\n");
+			usb_sg_cancel(&us->current_sg);
+		}
+	}
+
+	/* wait for the completion of the transfer */
+	usb_sg_wait(&us->current_sg);
+	clear_bit(US_FLIDX_SG_ACTIVE, &us->flags);
+
+	result = us->current_sg.status;
+	if (act_len)
+		*act_len = us->current_sg.bytes;
+	return interpret_urb_result(us, pipe, length, result,
+			us->current_sg.bytes);
+}
+
+/*
+ * Transfer an entire SCSI command's worth of data payload over the bulk
+ * pipe.
+ *
+ * Note that this uses usb_stor_bulk_transfer_buf() and
+ * usb_stor_bulk_transfer_sglist() to achieve its goals --
+ * this function simply determines whether we're going to use
+ * scatter-gather or not, and acts appropriately.
+ */
+int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe,
+		void *buf, unsigned int length_left, int use_sg, int *residual)
+{
+	int result;
+	unsigned int partial;
+
+	/* are we scatter-gathering? */
+	if (use_sg) {
+		/* use the usb core scatter-gather primitives */
+		result = usb_stor_bulk_transfer_sglist(us, pipe,
+				(struct scatterlist *) buf, use_sg,
+				length_left, &partial);
+		length_left -= partial;
+	} else {
+		/* no scatter-gather, just make the request */
+		result = usb_stor_bulk_transfer_buf(us, pipe, buf, 
+				length_left, &partial);
+		length_left -= partial;
+	}
+
+	/* store the residual and return the error code */
+	if (residual)
+		*residual = length_left;
+	return result;
+}
+
+/***********************************************************************
+ * Transport routines
+ ***********************************************************************/
+
+/* Invoke the transport and basic error-handling/recovery methods
+ *
+ * This is used by the protocol layers to actually send the message to
+ * the device and receive the response.
+ */
+void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
+{
+	int need_auto_sense;
+	int result;
+
+	/* send the command to the transport layer */
+	srb->resid = 0;
+	result = us->transport(srb, us);
+
+	/* if the command gets aborted by the higher layers, we need to
+	 * short-circuit all other processing
+	 */
+	if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
+		US_DEBUGP("-- command was aborted\n");
+		goto Handle_Abort;
+	}
+
+	/* if there is a transport error, reset and don't auto-sense */
+	if (result == USB_STOR_TRANSPORT_ERROR) {
+		US_DEBUGP("-- transport indicates error, resetting\n");
+		us->transport_reset(us);
+		srb->result = DID_ERROR << 16;
+		return;
+	}
+
+	/* if the transport provided its own sense data, don't auto-sense */
+	if (result == USB_STOR_TRANSPORT_NO_SENSE) {
+		srb->result = SAM_STAT_CHECK_CONDITION;
+		return;
+	}
+
+	srb->result = SAM_STAT_GOOD;
+
+	/* Determine if we need to auto-sense
+	 *
+	 * I normally don't use a flag like this, but it's almost impossible
+	 * to understand what's going on here if I don't.
+	 */
+	need_auto_sense = 0;
+
+	/*
+	 * If we're running the CB transport, which is incapable
+	 * of determining status on its own, we will auto-sense
+	 * unless the operation involved a data-in transfer.  Devices
+	 * can signal most data-in errors by stalling the bulk-in pipe.
+	 */
+	if ((us->protocol == US_PR_CB || us->protocol == US_PR_DPCM_USB) &&
+			srb->sc_data_direction != DMA_FROM_DEVICE) {
+		US_DEBUGP("-- CB transport device requiring auto-sense\n");
+		need_auto_sense = 1;
+	}
+
+	/*
+	 * If we have a failure, we're going to do a REQUEST_SENSE 
+	 * automatically.  Note that we differentiate between a command
+	 * "failure" and an "error" in the transport mechanism.
+	 */
+	if (result == USB_STOR_TRANSPORT_FAILED) {
+		US_DEBUGP("-- transport indicates command failure\n");
+		need_auto_sense = 1;
+	}
+
+	/*
+	 * A short transfer on a command where we don't expect it
+	 * is unusual, but it doesn't mean we need to auto-sense.
+	 */
+	if ((srb->resid > 0) &&
+	    !((srb->cmnd[0] == REQUEST_SENSE) ||
+	      (srb->cmnd[0] == INQUIRY) ||
+	      (srb->cmnd[0] == MODE_SENSE) ||
+	      (srb->cmnd[0] == LOG_SENSE) ||
+	      (srb->cmnd[0] == MODE_SENSE_10))) {
+		US_DEBUGP("-- unexpectedly short transfer\n");
+	}
+
+	/* Now, if we need to do the auto-sense, let's do it */
+	if (need_auto_sense) {
+		int temp_result;
+		void* old_request_buffer;
+		unsigned short old_sg;
+		unsigned old_request_bufflen;
+		unsigned char old_sc_data_direction;
+		unsigned char old_cmd_len;
+		unsigned char old_cmnd[MAX_COMMAND_SIZE];
+		unsigned long old_serial_number;
+		int old_resid;
+
+		US_DEBUGP("Issuing auto-REQUEST_SENSE\n");
+
+		/* save the old command */
+		memcpy(old_cmnd, srb->cmnd, MAX_COMMAND_SIZE);
+		old_cmd_len = srb->cmd_len;
+
+		/* set the command and the LUN */
+		memset(srb->cmnd, 0, MAX_COMMAND_SIZE);
+		srb->cmnd[0] = REQUEST_SENSE;
+		srb->cmnd[1] = old_cmnd[1] & 0xE0;
+		srb->cmnd[4] = 18;
+
+		/* FIXME: we must do the protocol translation here */
+		if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI)
+			srb->cmd_len = 6;
+		else
+			srb->cmd_len = 12;
+
+		/* set the transfer direction */
+		old_sc_data_direction = srb->sc_data_direction;
+		srb->sc_data_direction = DMA_FROM_DEVICE;
+
+		/* use the new buffer we have */
+		old_request_buffer = srb->request_buffer;
+		srb->request_buffer = srb->sense_buffer;
+
+		/* set the buffer length for transfer */
+		old_request_bufflen = srb->request_bufflen;
+		srb->request_bufflen = 18;
+
+		/* set up for no scatter-gather use */
+		old_sg = srb->use_sg;
+		srb->use_sg = 0;
+
+		/* change the serial number -- toggle the high bit*/
+		old_serial_number = srb->serial_number;
+		srb->serial_number ^= 0x80000000;
+
+		/* issue the auto-sense command */
+		old_resid = srb->resid;
+		srb->resid = 0;
+		temp_result = us->transport(us->srb, us);
+
+		/* let's clean up right away */
+		srb->resid = old_resid;
+		srb->request_buffer = old_request_buffer;
+		srb->request_bufflen = old_request_bufflen;
+		srb->use_sg = old_sg;
+		srb->serial_number = old_serial_number;
+		srb->sc_data_direction = old_sc_data_direction;
+		srb->cmd_len = old_cmd_len;
+		memcpy(srb->cmnd, old_cmnd, MAX_COMMAND_SIZE);
+
+		if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
+			US_DEBUGP("-- auto-sense aborted\n");
+			goto Handle_Abort;
+		}
+		if (temp_result != USB_STOR_TRANSPORT_GOOD) {
+			US_DEBUGP("-- auto-sense failure\n");
+
+			/* we skip the reset if this happens to be a
+			 * multi-target device, since failure of an
+			 * auto-sense is perfectly valid
+			 */
+			if (!(us->flags & US_FL_SCM_MULT_TARG))
+				us->transport_reset(us);
+			srb->result = DID_ERROR << 16;
+			return;
+		}
+
+		US_DEBUGP("-- Result from auto-sense is %d\n", temp_result);
+		US_DEBUGP("-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n",
+			  srb->sense_buffer[0],
+			  srb->sense_buffer[2] & 0xf,
+			  srb->sense_buffer[12], 
+			  srb->sense_buffer[13]);
+#ifdef CONFIG_USB_STORAGE_DEBUG
+		usb_stor_show_sense(
+			  srb->sense_buffer[2] & 0xf,
+			  srb->sense_buffer[12], 
+			  srb->sense_buffer[13]);
+#endif
+
+		/* set the result so the higher layers expect this data */
+		srb->result = SAM_STAT_CHECK_CONDITION;
+
+		/* If things are really okay, then let's show that.  Zero
+		 * out the sense buffer so the higher layers won't realize
+		 * we did an unsolicited auto-sense. */
+		if (result == USB_STOR_TRANSPORT_GOOD &&
+			/* Filemark 0, ignore EOM, ILI 0, no sense */
+				(srb->sense_buffer[2] & 0xaf) == 0 &&
+			/* No ASC or ASCQ */
+				srb->sense_buffer[12] == 0 &&
+				srb->sense_buffer[13] == 0) {
+			srb->result = SAM_STAT_GOOD;
+			srb->sense_buffer[0] = 0x0;
+		}
+	}
+
+	/* Did we transfer less than the minimum amount required? */
+	if (srb->result == SAM_STAT_GOOD &&
+			srb->request_bufflen - srb->resid < srb->underflow)
+		srb->result = (DID_ERROR << 16) | (SUGGEST_RETRY << 24);
+
+	return;
+
+	/* abort processing: the bulk-only transport requires a reset
+	 * following an abort */
+  Handle_Abort:
+	srb->result = DID_ABORT << 16;
+	if (us->protocol == US_PR_BULK)
+		us->transport_reset(us);
+}
+
+/* Stop the current URB transfer */
+void usb_stor_stop_transport(struct us_data *us)
+{
+	US_DEBUGP("%s called\n", __FUNCTION__);
+
+	/* If the state machine is blocked waiting for an URB,
+	 * let's wake it up.  The test_and_clear_bit() call
+	 * guarantees that if a URB has just been submitted,
+	 * it won't be cancelled more than once. */
+	if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->flags)) {
+		US_DEBUGP("-- cancelling URB\n");
+		usb_unlink_urb(us->current_urb);
+	}
+
+	/* If we are waiting for a scatter-gather operation, cancel it. */
+	if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->flags)) {
+		US_DEBUGP("-- cancelling sg request\n");
+		usb_sg_cancel(&us->current_sg);
+	}
+}
+
+/*
+ * Control/Bulk/Interrupt transport
+ */
+
+int usb_stor_CBI_transport(struct scsi_cmnd *srb, struct us_data *us)
+{
+	unsigned int transfer_length = srb->request_bufflen;
+	unsigned int pipe = 0;
+	int result;
+
+	/* COMMAND STAGE */
+	/* let's send the command via the control pipe */
+	result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
+				      US_CBI_ADSC, 
+				      USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, 
+				      us->ifnum, srb->cmnd, srb->cmd_len);
+
+	/* check the return code for the command */
+	US_DEBUGP("Call to usb_stor_ctrl_transfer() returned %d\n", result);
+
+	/* if we stalled the command, it means command failed */
+	if (result == USB_STOR_XFER_STALLED) {
+		return USB_STOR_TRANSPORT_FAILED;
+	}
+
+	/* Uh oh... serious problem here */
+	if (result != USB_STOR_XFER_GOOD) {
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* DATA STAGE */
+	/* transfer the data payload for this command, if one exists*/
+	if (transfer_length) {
+		pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 
+				us->recv_bulk_pipe : us->send_bulk_pipe;
+		result = usb_stor_bulk_transfer_sg(us, pipe,
+					srb->request_buffer, transfer_length,
+					srb->use_sg, &srb->resid);
+		US_DEBUGP("CBI data stage result is 0x%x\n", result);
+
+		/* if we stalled the data transfer it means command failed */
+		if (result == USB_STOR_XFER_STALLED)
+			return USB_STOR_TRANSPORT_FAILED;
+		if (result > USB_STOR_XFER_STALLED)
+			return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* STATUS STAGE */
+	result = usb_stor_intr_transfer(us, us->iobuf, 2);
+	US_DEBUGP("Got interrupt data (0x%x, 0x%x)\n", 
+			us->iobuf[0], us->iobuf[1]);
+	if (result != USB_STOR_XFER_GOOD)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	/* UFI gives us ASC and ASCQ, like a request sense
+	 *
+	 * REQUEST_SENSE and INQUIRY don't affect the sense data on UFI
+	 * devices, so we ignore the information for those commands.  Note
+	 * that this means we could be ignoring a real error on these
+	 * commands, but that can't be helped.
+	 */
+	if (us->subclass == US_SC_UFI) {
+		if (srb->cmnd[0] == REQUEST_SENSE ||
+		    srb->cmnd[0] == INQUIRY)
+			return USB_STOR_TRANSPORT_GOOD;
+		if (us->iobuf[0])
+			goto Failed;
+		return USB_STOR_TRANSPORT_GOOD;
+	}
+
+	/* If not UFI, we interpret the data as a result code 
+	 * The first byte should always be a 0x0.
+	 *
+	 * Some bogus devices don't follow that rule.  They stuff the ASC
+	 * into the first byte -- so if it's non-zero, call it a failure.
+	 */
+	if (us->iobuf[0]) {
+		US_DEBUGP("CBI IRQ data showed reserved bType 0x%x\n",
+				us->iobuf[0]);
+		goto Failed;
+
+	}
+
+	/* The second byte & 0x0F should be 0x0 for good, otherwise error */
+	switch (us->iobuf[1] & 0x0F) {
+		case 0x00: 
+			return USB_STOR_TRANSPORT_GOOD;
+		case 0x01: 
+			goto Failed;
+	}
+	return USB_STOR_TRANSPORT_ERROR;
+
+	/* the CBI spec requires that the bulk pipe must be cleared
+	 * following any data-in/out command failure (section 2.4.3.1.3)
+	 */
+  Failed:
+	if (pipe)
+		usb_stor_clear_halt(us, pipe);
+	return USB_STOR_TRANSPORT_FAILED;
+}
+
+/*
+ * Control/Bulk transport
+ */
+int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us)
+{
+	unsigned int transfer_length = srb->request_bufflen;
+	int result;
+
+	/* COMMAND STAGE */
+	/* let's send the command via the control pipe */
+	result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
+				      US_CBI_ADSC, 
+				      USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, 
+				      us->ifnum, srb->cmnd, srb->cmd_len);
+
+	/* check the return code for the command */
+	US_DEBUGP("Call to usb_stor_ctrl_transfer() returned %d\n", result);
+
+	/* if we stalled the command, it means command failed */
+	if (result == USB_STOR_XFER_STALLED) {
+		return USB_STOR_TRANSPORT_FAILED;
+	}
+
+	/* Uh oh... serious problem here */
+	if (result != USB_STOR_XFER_GOOD) {
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* DATA STAGE */
+	/* transfer the data payload for this command, if one exists*/
+	if (transfer_length) {
+		unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 
+				us->recv_bulk_pipe : us->send_bulk_pipe;
+		result = usb_stor_bulk_transfer_sg(us, pipe,
+					srb->request_buffer, transfer_length,
+					srb->use_sg, &srb->resid);
+		US_DEBUGP("CB data stage result is 0x%x\n", result);
+
+		/* if we stalled the data transfer it means command failed */
+		if (result == USB_STOR_XFER_STALLED)
+			return USB_STOR_TRANSPORT_FAILED;
+		if (result > USB_STOR_XFER_STALLED)
+			return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* STATUS STAGE */
+	/* NOTE: CB does not have a status stage.  Silly, I know.  So
+	 * we have to catch this at a higher level.
+	 */
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+/*
+ * Bulk only transport
+ */
+
+/* Determine what the maximum LUN supported is */
+int usb_stor_Bulk_max_lun(struct us_data *us)
+{
+	int result;
+
+	/* issue the command */
+	result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
+				 US_BULK_GET_MAX_LUN, 
+				 USB_DIR_IN | USB_TYPE_CLASS | 
+				 USB_RECIP_INTERFACE,
+				 0, us->ifnum, us->iobuf, 1, HZ);
+
+	US_DEBUGP("GetMaxLUN command result is %d, data is %d\n", 
+		  result, us->iobuf[0]);
+
+	/* if we have a successful request, return the result */
+	if (result > 0)
+		return us->iobuf[0];
+
+	/* 
+	 * Some devices (i.e. Iomega Zip100) need this -- apparently
+	 * the bulk pipes get STALLed when the GetMaxLUN request is
+	 * processed.   This is, in theory, harmless to all other devices
+	 * (regardless of if they stall or not).
+	 */
+	if (result == -EPIPE) {
+		usb_stor_clear_halt(us, us->recv_bulk_pipe);
+		usb_stor_clear_halt(us, us->send_bulk_pipe);
+	}
+
+	/*
+	 * Some devices don't like GetMaxLUN.  They may STALL the control
+	 * pipe, they may return a zero-length result, they may do nothing at
+	 * all and timeout, or they may fail in even more bizarrely creative
+	 * ways.  In these cases the best approach is to use the default
+	 * value: only one LUN.
+	 */
+	return 0;
+}
+
+int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
+{
+	struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
+	struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf;
+	unsigned int transfer_length = srb->request_bufflen;
+	unsigned int residue;
+	int result;
+	int fake_sense = 0;
+	unsigned int cswlen;
+	unsigned int cbwlen = US_BULK_CB_WRAP_LEN;
+
+	/* Take care of BULK32 devices; set extra byte to 0 */
+	if ( unlikely(us->flags & US_FL_BULK32)) {
+		cbwlen = 32;
+		us->iobuf[31] = 0;
+	}
+
+	/* set up the command wrapper */
+	bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
+	bcb->DataTransferLength = cpu_to_le32(transfer_length);
+	bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? 1 << 7 : 0;
+	bcb->Tag = srb->serial_number;
+	bcb->Lun = srb->device->lun;
+	if (us->flags & US_FL_SCM_MULT_TARG)
+		bcb->Lun |= srb->device->id << 4;
+	bcb->Length = srb->cmd_len;
+
+	/* copy the command payload */
+	memset(bcb->CDB, 0, sizeof(bcb->CDB));
+	memcpy(bcb->CDB, srb->cmnd, bcb->Length);
+
+	/* send it to out endpoint */
+	US_DEBUGP("Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n",
+			le32_to_cpu(bcb->Signature), bcb->Tag,
+			le32_to_cpu(bcb->DataTransferLength), bcb->Flags,
+			(bcb->Lun >> 4), (bcb->Lun & 0x0F), 
+			bcb->Length);
+	result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
+				bcb, cbwlen, NULL);
+	US_DEBUGP("Bulk command transfer result=%d\n", result);
+	if (result != USB_STOR_XFER_GOOD)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	/* DATA STAGE */
+	/* send/receive data payload, if there is any */
+
+	/* Some USB-IDE converter chips need a 100us delay between the
+	 * command phase and the data phase.  Some devices need a little
+	 * more than that, probably because of clock rate inaccuracies. */
+	if (unlikely(us->flags & US_FL_GO_SLOW))
+		udelay(110);
+
+	if (transfer_length) {
+		unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 
+				us->recv_bulk_pipe : us->send_bulk_pipe;
+		result = usb_stor_bulk_transfer_sg(us, pipe,
+					srb->request_buffer, transfer_length,
+					srb->use_sg, &srb->resid);
+		US_DEBUGP("Bulk data transfer result 0x%x\n", result);
+		if (result == USB_STOR_XFER_ERROR)
+			return USB_STOR_TRANSPORT_ERROR;
+
+		/* If the device tried to send back more data than the
+		 * amount requested, the spec requires us to transfer
+		 * the CSW anyway.  Since there's no point retrying the
+		 * the command, we'll return fake sense data indicating
+		 * Illegal Request, Invalid Field in CDB.
+		 */
+		if (result == USB_STOR_XFER_LONG)
+			fake_sense = 1;
+	}
+
+	/* See flow chart on pg 15 of the Bulk Only Transport spec for
+	 * an explanation of how this code works.
+	 */
+
+	/* get CSW for device status */
+	US_DEBUGP("Attempting to get CSW...\n");
+	result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
+				bcs, US_BULK_CS_WRAP_LEN, &cswlen);
+
+	/* Some broken devices add unnecessary zero-length packets to the
+	 * end of their data transfers.  Such packets show up as 0-length
+	 * CSWs.  If we encounter such a thing, try to read the CSW again.
+	 */
+	if (result == USB_STOR_XFER_SHORT && cswlen == 0) {
+		US_DEBUGP("Received 0-length CSW; retrying...\n");
+		result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
+				bcs, US_BULK_CS_WRAP_LEN, &cswlen);
+	}
+
+	/* did the attempt to read the CSW fail? */
+	if (result == USB_STOR_XFER_STALLED) {
+
+		/* get the status again */
+		US_DEBUGP("Attempting to get CSW (2nd try)...\n");
+		result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
+				bcs, US_BULK_CS_WRAP_LEN, NULL);
+	}
+
+	/* if we still have a failure at this point, we're in trouble */
+	US_DEBUGP("Bulk status result = %d\n", result);
+	if (result != USB_STOR_XFER_GOOD)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	/* check bulk status */
+	residue = le32_to_cpu(bcs->Residue);
+	US_DEBUGP("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n",
+			le32_to_cpu(bcs->Signature), bcs->Tag, 
+			residue, bcs->Status);
+	if (bcs->Tag != srb->serial_number || bcs->Status > US_BULK_STAT_PHASE) {
+		US_DEBUGP("Bulk logical error\n");
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* Some broken devices report odd signatures, so we do not check them
+	 * for validity against the spec. We store the first one we see,
+	 * and check subsequent transfers for validity against this signature.
+	 */
+	if (!us->bcs_signature) {
+		us->bcs_signature = bcs->Signature;
+		if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN))
+			US_DEBUGP("Learnt BCS signature 0x%08X\n",
+					le32_to_cpu(us->bcs_signature));
+	} else if (bcs->Signature != us->bcs_signature) {
+		US_DEBUGP("Signature mismatch: got %08X, expecting %08X\n",
+			  le32_to_cpu(bcs->Signature),
+			  le32_to_cpu(us->bcs_signature));
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* try to compute the actual residue, based on how much data
+	 * was really transferred and what the device tells us */
+	if (residue) {
+		if (!(us->flags & US_FL_IGNORE_RESIDUE)) {
+			residue = min(residue, transfer_length);
+			srb->resid = max(srb->resid, (int) residue);
+		}
+	}
+
+	/* based on the status code, we report good or bad */
+	switch (bcs->Status) {
+		case US_BULK_STAT_OK:
+			/* device babbled -- return fake sense data */
+			if (fake_sense) {
+				memcpy(srb->sense_buffer, 
+				       usb_stor_sense_invalidCDB, 
+				       sizeof(usb_stor_sense_invalidCDB));
+				return USB_STOR_TRANSPORT_NO_SENSE;
+			}
+
+			/* command good -- note that data could be short */
+			return USB_STOR_TRANSPORT_GOOD;
+
+		case US_BULK_STAT_FAIL:
+			/* command failed */
+			return USB_STOR_TRANSPORT_FAILED;
+
+		case US_BULK_STAT_PHASE:
+			/* phase error -- note that a transport reset will be
+			 * invoked by the invoke_transport() function
+			 */
+			return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	/* we should never get here, but if we do, we're in trouble */
+	return USB_STOR_TRANSPORT_ERROR;
+}
+
+/***********************************************************************
+ * Reset routines
+ ***********************************************************************/
+
+/* This is the common part of the device reset code.
+ *
+ * It's handy that every transport mechanism uses the control endpoint for
+ * resets.
+ *
+ * Basically, we send a reset with a 20-second timeout, so we don't get
+ * jammed attempting to do the reset.
+ */
+static int usb_stor_reset_common(struct us_data *us,
+		u8 request, u8 requesttype,
+		u16 value, u16 index, void *data, u16 size)
+{
+	int result;
+	int result2;
+	int rc = FAILED;
+
+	/* Let the SCSI layer know we are doing a reset, set the
+	 * RESETTING bit, and clear the ABORTING bit so that the reset
+	 * may proceed.
+	 */
+	scsi_lock(us_to_host(us));
+	usb_stor_report_device_reset(us);
+	set_bit(US_FLIDX_RESETTING, &us->flags);
+	clear_bit(US_FLIDX_ABORTING, &us->flags);
+	scsi_unlock(us_to_host(us));
+
+	/* A 20-second timeout may seem rather long, but a LaCie
+	 * StudioDrive USB2 device takes 16+ seconds to get going
+	 * following a powerup or USB attach event.
+	 */
+	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
+			request, requesttype, value, index, data, size,
+			20*HZ);
+	if (result < 0) {
+		US_DEBUGP("Soft reset failed: %d\n", result);
+		goto Done;
+	}
+
+ 	/* Give the device some time to recover from the reset,
+ 	 * but don't delay disconnect processing. */
+ 	wait_event_interruptible_timeout(us->delay_wait,
+ 			test_bit(US_FLIDX_DISCONNECTING, &us->flags),
+ 			HZ*6);
+	if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
+		US_DEBUGP("Reset interrupted by disconnect\n");
+		goto Done;
+	}
+
+	US_DEBUGP("Soft reset: clearing bulk-in endpoint halt\n");
+	result = usb_stor_clear_halt(us, us->recv_bulk_pipe);
+
+	US_DEBUGP("Soft reset: clearing bulk-out endpoint halt\n");
+	result2 = usb_stor_clear_halt(us, us->send_bulk_pipe);
+
+	/* return a result code based on the result of the control message */
+	if (result < 0 || result2 < 0) {
+		US_DEBUGP("Soft reset failed\n");
+		goto Done;
+	}
+	US_DEBUGP("Soft reset done\n");
+	rc = SUCCESS;
+
+  Done:
+	clear_bit(US_FLIDX_RESETTING, &us->flags);
+	return rc;
+}
+
+/* This issues a CB[I] Reset to the device in question
+ */
+#define CB_RESET_CMD_SIZE	12
+
+int usb_stor_CB_reset(struct us_data *us)
+{
+	US_DEBUGP("%s called\n", __FUNCTION__);
+
+	memset(us->iobuf, 0xFF, CB_RESET_CMD_SIZE);
+	us->iobuf[0] = SEND_DIAGNOSTIC;
+	us->iobuf[1] = 4;
+	return usb_stor_reset_common(us, US_CBI_ADSC, 
+				 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+				 0, us->ifnum, us->iobuf, CB_RESET_CMD_SIZE);
+}
+
+/* This issues a Bulk-only Reset to the device in question, including
+ * clearing the subsequent endpoint halts that may occur.
+ */
+int usb_stor_Bulk_reset(struct us_data *us)
+{
+	US_DEBUGP("%s called\n", __FUNCTION__);
+
+	return usb_stor_reset_common(us, US_BULK_RESET_REQUEST, 
+				 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+				 0, us->ifnum, NULL, 0);
+}