From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Tested-by: Arvydas Sidorenko <asido4@xxxxxxxxx>
---
drivers/media/usb/stkwebcam/stk-webcam.c | 3 ++-
drivers/media/usb/stkwebcam/stk-webcam.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
index f3fabda..e3442de 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.c
+++ b/drivers/media/usb/stkwebcam/stk-webcam.c
@@ -616,7 +616,7 @@ static ssize_t stk_read(struct file *fp, char __user *buf,
if (!is_present(dev))
return -EIO;
- if (dev->owner && dev->owner != fp)
+ if (dev->owner && (!dev->reading || dev->owner != fp))
return -EBUSY;
dev->owner = fp;
if (!is_streaming(dev)) {
@@ -624,6 +624,7 @@ static ssize_t stk_read(struct file *fp, char __user *buf,
|| stk_allocate_buffers(dev, 3)
|| stk_start_stream(dev))
return -ENOMEM;
+ dev->reading = 1;
spin_lock_irqsave(&dev->spinlock, flags);
for (i = 0; i < dev->n_sbufs; i++) {
list_add_tail(&dev->sio_bufs[i].list, &dev->sio_avail);
diff --git a/drivers/media/usb/stkwebcam/stk-webcam.h b/drivers/media/usb/stkwebcam/stk-webcam.h
index 03550cf..9bbfa3d 100644
--- a/drivers/media/usb/stkwebcam/stk-webcam.h
+++ b/drivers/media/usb/stkwebcam/stk-webcam.h
@@ -118,6 +118,7 @@ struct stk_camera {
int frame_size;
/* Streaming buffers */
+ int reading;
unsigned int n_sbufs;
struct stk_sio_buffer *sio_bufs;
struct list_head sio_avail;
--
1.7.10.4
--
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