diff options
author | Somya Anand <somyaanand214@gmail.com> | 2014-10-22 17:24:03 +0530 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-10-23 08:34:25 +0800 |
commit | 36beff6e20740e055c11ec87d9f41ea54a842db5 (patch) | |
tree | 1f4adb735f1742dbc51024f250646664fcfb50f7 /drivers/staging/dgnc/dgnc_tty.c | |
parent | 0a9858689017544743708b332c6b7a54df10b6fe (diff) |
Staging: dgnc: Remove unused sniff code
The output written by dgnc_sniff_nowait_nolock() is never used
anywhere since commit 35cf90459312f ("staging: dgnc: removes proc code")
deleted the code that used to copy it to user space.
dgnc_sniff_nowait_nolock() uses 'timeval' to create header timestamps for
the data dump.
32-bit systems using 'struct timeval' will break in the year 2038,
This patch removes dgnc_sniff_nowait_nolock() and all ch_sniff_* members
of struct channel_t defined in "dgnc_driver.h". It also removes their usage
from the driver files and hence y2038 issue is also resolved.
Signed-off-by: Somya Anand <somyaanand214@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/dgnc/dgnc_tty.c')
-rw-r--r-- | drivers/staging/dgnc/dgnc_tty.c | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c index b0fcbe7bdfe4..8384e3d770f1 100644 --- a/drivers/staging/dgnc/dgnc_tty.c +++ b/drivers/staging/dgnc/dgnc_tty.c @@ -49,7 +49,6 @@ #include <linux/delay.h> /* For udelay */ #include <linux/uaccess.h> /* For copy_from_user/copy_to_user */ #include <linux/pci.h> - #include "dgnc_driver.h" #include "dgnc_tty.h" #include "dgnc_types.h" @@ -374,7 +373,6 @@ int dgnc_tty_init(struct dgnc_board *brd) init_waitqueue_head(&ch->ch_flags_wait); init_waitqueue_head(&ch->ch_tun.un_flags_wait); init_waitqueue_head(&ch->ch_pun.un_flags_wait); - init_waitqueue_head(&ch->ch_sniff_wait); { struct device *classp; @@ -449,127 +447,6 @@ void dgnc_tty_uninit(struct dgnc_board *brd) #define TMPBUFLEN (1024) -/* - * dgnc_sniff - Dump data out to the "sniff" buffer if the - * proc sniff file is opened... - */ -void dgnc_sniff_nowait_nolock(struct channel_t *ch, unsigned char *text, unsigned char *buf, int len) -{ - struct timeval tv; - int n; - int r; - int nbuf; - int i; - int tmpbuflen; - char *tmpbuf; - char *p; - int too_much_data; - - tmpbuf = kzalloc(TMPBUFLEN, GFP_ATOMIC); - if (!tmpbuf) - return; - p = tmpbuf; - - /* Leave if sniff not open */ - if (!(ch->ch_sniff_flags & SNIFF_OPEN)) - goto exit; - - do_gettimeofday(&tv); - - /* Create our header for data dump */ - p += sprintf(p, "<%ld %ld><%s><", tv.tv_sec, tv.tv_usec, text); - tmpbuflen = p - tmpbuf; - - do { - too_much_data = 0; - - for (i = 0; i < len && tmpbuflen < (TMPBUFLEN - 4); i++) { - p += sprintf(p, "%02x ", *buf); - buf++; - tmpbuflen = p - tmpbuf; - } - - if (tmpbuflen < (TMPBUFLEN - 4)) { - if (i > 0) - p += sprintf(p - 1, "%s\n", ">"); - else - p += sprintf(p, "%s\n", ">"); - } else { - too_much_data = 1; - len -= i; - } - - nbuf = strlen(tmpbuf); - p = tmpbuf; - - /* - * Loop while data remains. - */ - while (nbuf > 0 && ch->ch_sniff_buf) { - /* - * Determine the amount of available space left in the - * buffer. If there's none, wait until some appears. - */ - n = (ch->ch_sniff_out - ch->ch_sniff_in - 1) & SNIFF_MASK; - - /* - * If there is no space left to write to in our sniff buffer, - * we have no choice but to drop the data. - * We *cannot* sleep here waiting for space, because this - * function was probably called by the interrupt/timer routines! - */ - if (n == 0) - goto exit; - - /* - * Copy as much data as will fit. - */ - - if (n > nbuf) - n = nbuf; - - r = SNIFF_MAX - ch->ch_sniff_in; - - if (r <= n) { - memcpy(ch->ch_sniff_buf + ch->ch_sniff_in, p, r); - - n -= r; - ch->ch_sniff_in = 0; - p += r; - nbuf -= r; - } - - memcpy(ch->ch_sniff_buf + ch->ch_sniff_in, p, n); - - ch->ch_sniff_in += n; - p += n; - nbuf -= n; - - /* - * Wakeup any thread waiting for data - */ - if (ch->ch_sniff_flags & SNIFF_WAIT_DATA) { - ch->ch_sniff_flags &= ~SNIFF_WAIT_DATA; - wake_up_interruptible(&ch->ch_sniff_wait); - } - } - - /* - * If the user sent us too much data to push into our tmpbuf, - * we need to keep looping around on all the data. - */ - if (too_much_data) { - p = tmpbuf; - tmpbuflen = 0; - } - - } while (too_much_data); - -exit: - kfree(tmpbuf); -} - - /*======================================================================= * * dgnc_wmove - Write data to transmit queue. @@ -784,8 +661,6 @@ void dgnc_input(struct channel_t *ch) tty_insert_flip_string(tp->port, ch->ch_rqueue + tail, s); } - dgnc_sniff_nowait_nolock(ch, "USER READ", ch->ch_rqueue + tail, s); - tail += s; n -= s; /* Flip queue if needed */ @@ -1981,7 +1856,6 @@ static int dgnc_tty_write(struct tty_struct *tty, if (n >= remain) { n -= remain; memcpy(ch->ch_wqueue + head, buf, remain); - dgnc_sniff_nowait_nolock(ch, "USER WRITE", ch->ch_wqueue + head, remain); head = 0; buf += remain; } @@ -1992,7 +1866,6 @@ static int dgnc_tty_write(struct tty_struct *tty, */ remain = n; memcpy(ch->ch_wqueue + head, buf, remain); - dgnc_sniff_nowait_nolock(ch, "USER WRITE", ch->ch_wqueue + head, remain); head += remain; } |