V4L/DVB (8772): cx18: Convert cx18_queue buffers member to atomic_t

cx18: Convert cx18_queue buffers member to atomic_t.  This allows safe
concurrent access to check if a queue has data without having to acquire the
queue spinlock.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/media/video/cx18/cx18-fileops.c b/drivers/media/video/cx18/cx18-fileops.c
index 2fdbfb994dd5..eb0144f95562 100644
--- a/drivers/media/video/cx18/cx18-fileops.c
+++ b/drivers/media/video/cx18/cx18-fileops.c
@@ -223,7 +223,7 @@ static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block,
                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
                 /* New buffers might have become available before we were added
                    to the waitqueue */
-                if (!s->q_full.buffers)
+                if (!atomic_read(&s->q_full.buffers))
                         schedule();
                 finish_wait(&s->waitq, &wait);
                 if (signal_pending(current)) {
@@ -509,7 +509,7 @@ unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
         CX18_DEBUG_HI_FILE("Encoder poll\n");
         poll_wait(filp, &s->waitq, wait);
 
-        if (s->q_full.buffers || s->q_io.buffers)
+        if (atomic_read(&s->q_full.buffers) || atomic_read(&s->q_io.buffers))
                 return POLLIN | POLLRDNORM;
         if (eof)
                 return POLLHUP;