Read errno before media_dbg calls

The media_dbg() in error paths can modify the errno value, leading to
the wrong error (or no error at all) being returned. Fix this by reading
the errno value before calling media_dbg().

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/v4l2subdev.c b/src/v4l2subdev.c
index 2d45d7f..efc6708 100644
--- a/src/v4l2subdev.c
+++ b/src/v4l2subdev.c
@@ -45,10 +45,11 @@ int v4l2_subdev_open(struct media_entity *entity)
 
 	entity->fd = open(entity->devname, O_RDWR);
 	if (entity->fd == -1) {
+		int ret = -errno;
 		media_dbg(entity->media,
 			  "%s: Failed to open subdev device node %s\n", __func__,
 			  entity->devname);
-		return -errno;
+		return ret;
 	}
 
 	return 0;