[media] mem2mem: make queue lock in v4l2_m2m_poll interruptible

This patch makes the queue lock taken in v4l2_m2m_poll interruptible.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 178ce96556c6..97defed7c1ac 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -568,8 +568,12 @@ unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 
         if (m2m_ctx->m2m_dev->m2m_ops->lock)
                 m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv);
-        else if (m2m_ctx->q_lock)
-                mutex_lock(m2m_ctx->q_lock);
+        else if (m2m_ctx->q_lock) {
+                if (mutex_lock_interruptible(m2m_ctx->q_lock)) {
+                        rc |= POLLERR;
+                        goto end;
+                }
+        }
 
         spin_lock_irqsave(&src_q->done_lock, flags);
         if (!list_empty(&src_q->done_list))