[PATCH v5] media: vimc: streamer: if kthread_stop fails, ignore the error

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Ignore errors returned from kthread_stop since the
vimc subdevices should still be notified that
streaming stopped so they can release the memory for
the streaming, and also kthread should be set to NULL.
kthread_stop can return -EINTR in case the thread
did not yet run. This can happen if userspace calls
streamon and streamoff right after.

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx>
---
changes from v4: change dev_warn to dev_dbg, delete and add a empty lines
Changes from v3: change the comment to explain when kthread fails
changes since v2: add a comment explaning why we ignore the error
Changes from v1: undo deletion of an empty line

 drivers/media/platform/vimc/vimc-streamer.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/vimc/vimc-streamer.c b/drivers/media/platform/vimc/vimc-streamer.c
index cd6b55433c9e..9d2b1ff2ba45 100644
--- a/drivers/media/platform/vimc/vimc-streamer.c
+++ b/drivers/media/platform/vimc/vimc-streamer.c
@@ -215,8 +215,14 @@ int vimc_streamer_s_stream(struct vimc_stream *stream,
 			return 0;
 
 		ret = kthread_stop(stream->kthread);
+		/*
+		 * kthread_stop returns -EINTR in cases when streamon was
+		 * immediately followed by streamoff, and the thread didn't had
+		 * a chance to run. Ignore errors to stop the stream in the
+		 * pipeline.
+		 */
 		if (ret)
-			return ret;
+			dev_dbg(ved->dev, "kthread_stop returned '%d'\n", ret);
 
 		stream->kthread = NULL;
 
-- 
2.17.1




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