media: imx: work around false-positive warning

The IS_ERR()/PTR_ERR() combination confuses gcc to the point that it
cannot prove the upstream_ep variable to be initialized:

drivers/staging/media/imx/imx-media-csi.c: In function 'csi_link_validate':
drivers/staging/media/imx/imx-media-csi.c:1025:20: error: 'upstream_ep' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  priv->upstream_ep = upstream_ep;
  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
drivers/staging/media/imx/imx-media-csi.c:1026:24: error: 'upstream_ep.bus_type' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  is_csi2 = (upstream_ep.bus_type == V4L2_MBUS_CSI2);
             ~~~~~~~~~~~^~~~~~~~~
drivers/staging/media/imx/imx-media-csi.c:127:19: error: 'upstream_ep.bus.parallel.bus_width' may be used uninitialized in this function [-Werror=maybe-uninitialized]

I could come up with no good way to rewrite this function, as a last
resort, this adds an explicit zero-intialization of the structure.

Fixes: 52e17089d185 ("media: imx: Don't initialize vars that won't be used")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 1aa2be891704e99f40f65056bbf33246f869015d..00c9d625cfb543dbd6b6075aa58f5b742b5dcf95 100644 (file)
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1005,7 +1005,7 @@ static int csi_link_validate(struct v4l2_subdev *sd,
                             struct v4l2_subdev_format *sink_fmt)
 {
        struct csi_priv *priv = v4l2_get_subdevdata(sd);
-       struct v4l2_fwnode_endpoint upstream_ep;
+       struct v4l2_fwnode_endpoint upstream_ep = {};
        const struct imx_media_pixfmt *incc;
        bool is_csi2;
        int ret;