diff options
| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2012-02-14 11:37:21 +0100 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2012-02-14 13:44:53 +0200 |
| commit | 6e4b74e4690dd03b5664fa4895c3db0607d64742 (patch) | |
| tree | 607c5bd1c23be029b589971e512458fde91ed0fa | |
| parent | d5261286949fc9ada701c7e30bf89e08a6dbf4de (diff) | |
usb: renesas: fix scheduling in atomic context bug
The current renesas_usbhs driver triggers
BUG: scheduling while atomic: ksoftirqd/0/3/0x00000102
with enabled CONFIG_DEBUG_ATOMIC_SLEEP, by submitting DMA transfers from
an atomic (tasklet) context, which is not supported by the shdma dmaengine
driver. Fix it by switching to a work.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
| -rw-r--r-- | drivers/usb/renesas_usbhs/fifo.c | 18 | ||||
| -rw-r--r-- | drivers/usb/renesas_usbhs/fifo.h | 3 |
2 files changed, 8 insertions, 13 deletions
diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c index fb2a88c5c210..3648c82a17fe 100644 --- a/drivers/usb/renesas_usbhs/fifo.c +++ b/drivers/usb/renesas_usbhs/fifo.c @@ -765,9 +765,9 @@ static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map) } static void usbhsf_dma_complete(void *arg); -static void usbhsf_dma_prepare_tasklet(unsigned long data) +static void xfer_work(struct work_struct *work) { - struct usbhs_pkt *pkt = (struct usbhs_pkt *)data; + struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work); struct usbhs_pipe *pipe = pkt->pipe; struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe); struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe); @@ -847,11 +847,8 @@ static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done) pkt->trans = len; - tasklet_init(&fifo->tasklet, - usbhsf_dma_prepare_tasklet, - (unsigned long)pkt); - - tasklet_schedule(&fifo->tasklet); + INIT_WORK(&pkt->work, xfer_work); + schedule_work(&pkt->work); return 0; @@ -941,11 +938,8 @@ static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done) pkt->trans = len; - tasklet_init(&fifo->tasklet, - usbhsf_dma_prepare_tasklet, - (unsigned long)pkt); - - tasklet_schedule(&fifo->tasklet); + INIT_WORK(&pkt->work, xfer_work); + schedule_work(&pkt->work); return 0; diff --git a/drivers/usb/renesas_usbhs/fifo.h b/drivers/usb/renesas_usbhs/fifo.h index f68609c0f489..c31731a843d1 100644 --- a/drivers/usb/renesas_usbhs/fifo.h +++ b/drivers/usb/renesas_usbhs/fifo.h @@ -19,6 +19,7 @@ #include <linux/interrupt.h> #include <linux/sh_dma.h> +#include <linux/workqueue.h> #include <asm/dma.h> #include "pipe.h" @@ -31,7 +32,6 @@ struct usbhs_fifo { u32 ctr; /* xFIFOCTR */ struct usbhs_pipe *pipe; - struct tasklet_struct tasklet; struct dma_chan *tx_chan; struct dma_chan *rx_chan; @@ -53,6 +53,7 @@ struct usbhs_pkt { struct usbhs_pkt_handle *handler; void (*done)(struct usbhs_priv *priv, struct usbhs_pkt *pkt); + struct work_struct work; dma_addr_t dma; void *buf; int length; |