diff options
| author | Andy Walls <awalls@radix.net> | 2008-09-03 16:47:50 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-09-03 18:36:43 -0300 |
| commit | 0058717a1ef0c87deeccbe0a3b17def173fee9a9 (patch) | |
| tree | 54f6ec97deb79e8beba8098d64c52fbe9dfe7c2d | |
| parent | 46f2c21cfdb1a829a9a23e23562ffa66b007dc48 (diff) | |
V4L/DVB (8701): cx18: Add missing lock for when the irq handler manipulates the queues
cx18: Add missing lock for when the irq handler manipulates the queues. This
was a potential source of stream queue corruption. Also changed the name of
cx18_queue_find_buf() to cx18_queue_get_buf_irq().
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/cx18/cx18-irq.c | 2 | ||||
| -rw-r--r-- | drivers/media/video/cx18/cx18-queue.c | 23 | ||||
| -rw-r--r-- | drivers/media/video/cx18/cx18-queue.h | 2 |
3 files changed, 15 insertions, 12 deletions
diff --git a/drivers/media/video/cx18/cx18-irq.c b/drivers/media/video/cx18/cx18-irq.c index 25114a5cbd5..ab218315c84 100644 --- a/drivers/media/video/cx18/cx18-irq.c +++ b/drivers/media/video/cx18/cx18-irq.c @@ -61,7 +61,7 @@ static void epu_dma_done(struct cx18 *cx, struct cx18_mailbox *mb) CX18_WARN("Ack struct = %d for %s\n", mb->args[2], s->name); id = read_enc(off); - buf = cx18_queue_find_buf(s, id, read_enc(off + 4)); + buf = cx18_queue_get_buf_irq(s, id, read_enc(off + 4)); CX18_DEBUG_HI_DMA("DMA DONE for %s (buffer %d)\n", s->name, id); if (buf) { cx18_buf_sync_for_cpu(s, buf); diff --git a/drivers/media/video/cx18/cx18-queue.c b/drivers/media/video/cx18/cx18-queue.c index 6990b77c620..8a4dd821fd9 100644 --- a/drivers/media/video/cx18/cx18-queue.c +++ b/drivers/media/video/cx18/cx18-queue.c @@ -78,12 +78,13 @@ struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q) return buf; } -struct cx18_buffer *cx18_queue_find_buf(struct cx18_stream *s, u32 id, +struct cx18_buffer *cx18_queue_get_buf_irq(struct cx18_stream *s, u32 id, u32 bytesused) { struct cx18 *cx = s->cx; struct list_head *p; + spin_lock(&s->qlock); list_for_each(p, &s->q_free.list) { struct cx18_buffer *buf = list_entry(p, struct cx18_buffer, list); @@ -92,17 +93,19 @@ struct cx18_buffer *cx18_queue_find_buf(struct cx18_stream *s, u32 id, continue; buf->bytesused = bytesused; /* the transport buffers are handled differently, - so there is no need to move them to the full queue */ - if (s->type == CX18_ENC_STREAM_TYPE_TS) - return buf; - s->q_free.buffers--; - s->q_free.length -= s->buf_size; - s->q_full.buffers++; - s->q_full.length += s->buf_size; - s->q_full.bytesused += buf->bytesused; - list_move_tail(&buf->list, &s->q_full.list); + they are not moved to the full queue */ + if (s->type != CX18_ENC_STREAM_TYPE_TS) { + s->q_free.buffers--; + s->q_free.length -= s->buf_size; + s->q_full.buffers++; + s->q_full.length += s->buf_size; + s->q_full.bytesused += buf->bytesused; + list_move_tail(&buf->list, &s->q_full.list); + } + spin_unlock(&s->qlock); return buf; } + spin_unlock(&s->qlock); CX18_ERR("Cannot find buffer %d for stream %s\n", id, s->name); return NULL; } diff --git a/drivers/media/video/cx18/cx18-queue.h b/drivers/media/video/cx18/cx18-queue.h index 91423b9863a..7f93bb13c09 100644 --- a/drivers/media/video/cx18/cx18-queue.h +++ b/drivers/media/video/cx18/cx18-queue.h @@ -46,7 +46,7 @@ void cx18_queue_init(struct cx18_queue *q); void cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf, struct cx18_queue *q); struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q); -struct cx18_buffer *cx18_queue_find_buf(struct cx18_stream *s, u32 id, +struct cx18_buffer *cx18_queue_get_buf_irq(struct cx18_stream *s, u32 id, u32 bytesused); void cx18_flush_queues(struct cx18_stream *s); |