diff options
| author | sensoray-dev <linux-dev@sensoray.com> | 2014-11-04 23:34:03 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2014-11-11 13:47:22 +0300 |
| commit | 9694fbec951b9aa56815d423f2c53d17a4a9635c (patch) | |
| tree | 53e89ee94f14adc07a61528f0ee7533f70d06d40 /drivers | |
| parent | 6db47fa1f1a214bc1ea5a59a32f58188f6b255e9 (diff) | |
| download | linux-9694fbec951b9aa56815d423f2c53d17a4a9635c.tar.xz | |
[media] s2255drv: fix spinlock issue
qlock spinlock controls access to buf_list and sequence.
qlock spinlock should not be locked during a copy to video buffers, an
operation that may sleep.
Signed-off-by: Dean Anderson <linux-dev@sensoray.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/usb/s2255/s2255drv.c | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/drivers/media/usb/s2255/s2255drv.c b/drivers/media/usb/s2255/s2255drv.c index ccc00099b261..a56a05b0c4e1 100644 --- a/drivers/media/usb/s2255/s2255drv.c +++ b/drivers/media/usb/s2255/s2255drv.c @@ -558,27 +558,30 @@ static void s2255_fwchunk_complete(struct urb *urb) } -static int s2255_got_frame(struct s2255_vc *vc, int jpgsize) +static void s2255_got_frame(struct s2255_vc *vc, int jpgsize) { struct s2255_buffer *buf; struct s2255_dev *dev = to_s2255_dev(vc->vdev.v4l2_dev); unsigned long flags = 0; - int rc = 0; + spin_lock_irqsave(&vc->qlock, flags); if (list_empty(&vc->buf_list)) { dprintk(dev, 1, "No active queue to serve\n"); - rc = -1; - goto unlock; + spin_unlock_irqrestore(&vc->qlock, flags); + return; } buf = list_entry(vc->buf_list.next, struct s2255_buffer, list); list_del(&buf->list); v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp); + buf->vb.v4l2_buf.field = vc->field; + buf->vb.v4l2_buf.sequence = vc->frame_count; + spin_unlock_irqrestore(&vc->qlock, flags); + s2255_fillbuff(vc, buf, jpgsize); + /* tell v4l buffer was filled */ + vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE); dprintk(dev, 2, "%s: [buf] [%p]\n", __func__, buf); -unlock: - spin_unlock_irqrestore(&vc->qlock, flags); - return rc; } static const struct s2255_fmt *format_by_fourcc(int fourcc) @@ -649,11 +652,6 @@ static void s2255_fillbuff(struct s2255_vc *vc, } dprintk(dev, 2, "s2255fill at : Buffer 0x%08lx size= %d\n", (unsigned long)vbuf, pos); - /* tell v4l buffer was filled */ - buf->vb.v4l2_buf.field = vc->field; - buf->vb.v4l2_buf.sequence = vc->frame_count; - v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp); - vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE); } |