Re: [PATCH 2/4] [media] davinci: vpif_capture: don't lock over s_stream

Hans Verkuil [off-list ref] writes:

On 19/11/16 01:32, Kevin Hilman wrote:

quoted

Video capture subdevs may be over I2C and may sleep during xfer, so we
cannot do IRQ-disabled locking when calling the subdev.

Signed-off-by: Kevin Hilman <khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
---
 drivers/media/platform/davinci/vpif_capture.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 79cef74e164f..becc3e63b472 100644
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/drivers/media/platform/davinci/vpif_capture.c

@@ -193,12 +193,16 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
 		}
 	}

+	spin_unlock_irqrestore(&common->irqlock, flags);
+
 	ret = v4l2_subdev_call(ch->sd, video, s_stream, 1);
 	if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV) {
 		vpif_dbg(1, debug, "stream on failed in subdev\n");
 		goto err;
 	}

+	spin_lock_irqsave(&common->irqlock, flags);

This needs to be moved to right after the v4l2_subdev_call, otherwise the
goto err above will not have the spinlock.

Yes indeed.  Will respin.

Kevin
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