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| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2009-08-05 20:06:31 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-08-13 20:39:11 -0300 |
| commit | 2dd54a54c19d0e5b50f4e1c591653772ead9d4a1 (patch) | |
| tree | 3ab873ae09a4cc3f56906dbb4712e1331a078519 /drivers/media/video/mx3_camera.c | |
| parent | 7d2e2e35fb50f381c9398e481aac1e1729765ae3 (diff) | |
| download | kernel_samsung_smdk4412-2dd54a54c19d0e5b50f4e1c591653772ead9d4a1.tar.gz kernel_samsung_smdk4412-2dd54a54c19d0e5b50f4e1c591653772ead9d4a1.tar.bz2 kernel_samsung_smdk4412-2dd54a54c19d0e5b50f4e1c591653772ead9d4a1.zip | |
V4L/DVB (12424): soc-camera: fix recursive locking in .buf_queue()
The .buf_queue() V4L2 driver method is called under
spinlock_irqsave(q->irqlock,...), don't take the lock again inside the
function.
Reported-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/mx3_camera.c')
| -rw-r--r-- | drivers/media/video/mx3_camera.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/media/video/mx3_camera.c b/drivers/media/video/mx3_camera.c index e605c076ed8..9770cb7932c 100644 --- a/drivers/media/video/mx3_camera.c +++ b/drivers/media/video/mx3_camera.c @@ -332,7 +332,10 @@ static enum pixel_fmt fourcc_to_ipu_pix(__u32 fourcc) } } -/* Called with .vb_lock held */ +/* + * Called with .vb_lock mutex held and + * under spinlock_irqsave(&mx3_cam->lock, ...) + */ static void mx3_videobuf_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) { @@ -346,7 +349,8 @@ static void mx3_videobuf_queue(struct videobuf_queue *vq, struct idmac_video_param *video = &ichan->params.video; const struct soc_camera_data_format *data_fmt = icd->current_fmt; dma_cookie_t cookie; - unsigned long flags; + + BUG_ON(!irqs_disabled()); /* This is the configuration of one sg-element */ video->out_pixel_fmt = fourcc_to_ipu_pix(data_fmt->fourcc); @@ -359,8 +363,6 @@ static void mx3_videobuf_queue(struct videobuf_queue *vq, memset((void *)vb->baddr, 0xaa, vb->bsize); #endif - spin_lock_irqsave(&mx3_cam->lock, flags); - list_add_tail(&vb->queue, &mx3_cam->capture); if (!mx3_cam->active) { @@ -370,24 +372,23 @@ static void mx3_videobuf_queue(struct videobuf_queue *vq, vb->state = VIDEOBUF_QUEUED; } - spin_unlock_irqrestore(&mx3_cam->lock, flags); + spin_unlock_irq(&mx3_cam->lock); cookie = txd->tx_submit(txd); dev_dbg(&icd->dev, "Submitted cookie %d DMA 0x%08x\n", cookie, sg_dma_address(&buf->sg)); + + spin_lock_irq(&mx3_cam->lock); + if (cookie >= 0) return; /* Submit error */ vb->state = VIDEOBUF_PREPARED; - spin_lock_irqsave(&mx3_cam->lock, flags); - list_del_init(&vb->queue); if (mx3_cam->active == buf) mx3_cam->active = NULL; - - spin_unlock_irqrestore(&mx3_cam->lock, flags); } /* Called with .vb_lock held */ |