From: Ezequiel Garcia ezequiel@collabora.com
[ Upstream commit cd63c0288fd760ce7de247fba618e2bbcfc0c35c ]
Currently, this driver does not serialize its video4linux ioctls, which is a bug, as race conditions might appear.
In addition, video_device and vb2_queue locks are now both mandatory. Add them, and implement wait_prepare and wait_finish.
To stay on the safe side, this commit uses a single mutex for both locks. Better latency can be obtained by separating these if needed.
Signed-off-by: Ezequiel Garcia ezequiel@collabora.com Signed-off-by: Hans Verkuil hans.verkuil@cisco.com Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- drivers/media/pci/sta2x11/sta2x11_vip.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/media/pci/sta2x11/sta2x11_vip.c b/drivers/media/pci/sta2x11/sta2x11_vip.c index 069c4a853346..da2b2a2292d0 100644 --- a/drivers/media/pci/sta2x11/sta2x11_vip.c +++ b/drivers/media/pci/sta2x11/sta2x11_vip.c @@ -145,6 +145,7 @@ struct sta2x11_vip { unsigned int sequence; struct vip_buffer *active; /* current active buffer */ spinlock_t lock; /* Used in videobuf2 callback */ + struct mutex v4l_lock;
/* Interrupt counters */ int tcount, bcount; @@ -385,6 +386,8 @@ static const struct vb2_ops vip_video_qops = { .buf_queue = buffer_queue, .start_streaming = start_streaming, .stop_streaming = stop_streaming, + .wait_prepare = vb2_ops_wait_prepare, + .wait_finish = vb2_ops_wait_finish, };
@@ -870,6 +873,7 @@ static int sta2x11_vip_init_buffer(struct sta2x11_vip *vip) vip->vb_vidq.mem_ops = &vb2_dma_contig_memops; vip->vb_vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; vip->vb_vidq.dev = &vip->pdev->dev; + vip->vb_vidq.lock = &vip->v4l_lock; err = vb2_queue_init(&vip->vb_vidq); if (err) return err; @@ -1034,6 +1038,7 @@ static int sta2x11_vip_init_one(struct pci_dev *pdev, vip->std = V4L2_STD_PAL; vip->format = formats_50[0]; vip->config = config; + mutex_init(&vip->v4l_lock);
ret = sta2x11_vip_init_controls(vip); if (ret) @@ -1080,6 +1085,7 @@ static int sta2x11_vip_init_one(struct pci_dev *pdev, vip->video_dev = video_dev_template; vip->video_dev.v4l2_dev = &vip->v4l2_dev; vip->video_dev.queue = &vip->vb_vidq; + vip->video_dev.lock = &vip->v4l_lock; video_set_drvdata(&vip->video_dev, vip);
ret = video_register_device(&vip->video_dev, VFL_TYPE_GRABBER, -1);