Hi Leandro and Pablo,
could you please try the following patch ? It closes a race window that I
believe could be at the core of your kernel panic.
diff -r c1f376eae978 linux/drivers/media/video/uvc/uvc_queue.c
--- a/linux/drivers/media/video/uvc/uvc_queue.c Sat Dec 12 18:57:17 2009 +0100
+++ b/linux/drivers/media/video/uvc/uvc_queue.c Wed Dec 16 01:10:21 2009 +0100
@@ -59,7 +59,7 @@
* returns immediately.
*
* When the buffer is full, the completion handler removes it from the irq
- * queue, marks it as ready (UVC_BUF_STATE_DONE) and wakes its wait queue.
+ * queue, marks it as ready (UVC_BUF_STATE_READY) and wakes its wait queue.
* At that point, any process waiting on the buffer will be woken up. If a
* process tries to dequeue a buffer after it has been marked ready, the
* dequeing will succeed immediately.
@@ -196,11 +196,12 @@
switch (buf->state) {
case UVC_BUF_STATE_ERROR:
- case UVC_BUF_STATE_DONE:
+ case UVC_BUF_STATE_READY:
v4l2_buf->flags |= V4L2_BUF_FLAG_DONE;
break;
case UVC_BUF_STATE_QUEUED:
case UVC_BUF_STATE_ACTIVE:
+ case UVC_BUF_STATE_DONE:
v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED;
break;
case UVC_BUF_STATE_IDLE:
@@ -341,13 +342,14 @@
uvc_trace(UVC_TRACE_CAPTURE, "[W] Corrupted data "
"(transmission error).\n");
ret = -EIO;
- case UVC_BUF_STATE_DONE:
+ case UVC_BUF_STATE_READY:
buf->state = UVC_BUF_STATE_IDLE;
break;
case UVC_BUF_STATE_IDLE:
case UVC_BUF_STATE_QUEUED:
case UVC_BUF_STATE_ACTIVE:
+ case UVC_BUF_STATE_DONE:
default:
uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state %u "
"(driver bug?).\n", buf->state);
@@ -383,7 +385,7 @@
buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream);
poll_wait(file, &buf->wait, wait);
- if (buf->state == UVC_BUF_STATE_DONE ||
+ if (buf->state == UVC_BUF_STATE_READY ||
buf->state == UVC_BUF_STATE_ERROR)
mask |= POLLIN | POLLRDNORM;
@@ -489,6 +491,7 @@
spin_lock_irqsave(&queue->irqlock, flags);
list_del(&buf->queue);
+ buf->state = UVC_BUF_STATE_READY;
if (!list_empty(&queue->irqqueue))
nextbuf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
queue);
diff -r c1f376eae978 linux/drivers/media/video/uvc/uvc_video.c
--- a/linux/drivers/media/video/uvc/uvc_video.c Sat Dec 12 18:57:17 2009 +0100
+++ b/linux/drivers/media/video/uvc/uvc_video.c Wed Dec 16 01:10:21 2009 +0100
@@ -578,8 +578,7 @@
uvc_video_decode_end(stream, buf, mem,
urb->iso_frame_desc[i].actual_length);
- if (buf->state == UVC_BUF_STATE_DONE ||
- buf->state == UVC_BUF_STATE_ERROR)
+ if (buf->state == UVC_BUF_STATE_DONE)
buf = uvc_queue_next_buffer(&stream->queue, buf);
}
}
@@ -637,8 +636,7 @@
if (!stream->bulk.skip_payload && buf != NULL) {
uvc_video_decode_end(stream, buf, stream->bulk.header,
stream->bulk.payload_size);
- if (buf->state == UVC_BUF_STATE_DONE ||
- buf->state == UVC_BUF_STATE_ERROR)
+ if (buf->state == UVC_BUF_STATE_DONE)
buf = uvc_queue_next_buffer(&stream->queue,
buf);
}
diff -r c1f376eae978 linux/drivers/media/video/uvc/uvcvideo.h
--- a/linux/drivers/media/video/uvc/uvcvideo.h Sat Dec 12 18:57:17 2009 +0100
+++ b/linux/drivers/media/video/uvc/uvcvideo.h Wed Dec 16 01:10:21 2009 +0100
@@ -370,7 +370,8 @@
UVC_BUF_STATE_QUEUED = 1,
UVC_BUF_STATE_ACTIVE = 2,
UVC_BUF_STATE_DONE = 3,
- UVC_BUF_STATE_ERROR = 4,
+ UVC_BUF_STATE_READY = 4,
+ UVC_BUF_STATE_ERROR = 5,
};
struct uvc_buffer {
--
Regards,
Laurent Pinchart
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