drm: imx: fix compiler warning with gcc-12

[ Upstream commit 7aefd8b53815274f3ef398d370a3c9b27dd9f00c ]

Gcc-12 correctly warned about this code using a non-NULL pointer as a
truth value:

  drivers/gpu/drm/imx/ipuv3-crtc.c: In function ‘ipu_crtc_disable_planes’:
  drivers/gpu/drm/imx/ipuv3-crtc.c:72:21: error: the comparison will always evaluate as ‘true’ for the address of ‘plane’ will never be NULL [-Werror=address]
     72 |                 if (&ipu_crtc->plane[1] && plane == &ipu_crtc->plane[1]->base)
        |                     ^

due to the extraneous '&' address-of operator.

Philipp Zabel points out that The mistake had no adverse effect since
the following condition doesn't actually dereference the NULL pointer,
but the intent of the code was obviously to check for it, not to take
the address of the member.

Fixes: eb8c88808c83 ("drm/imx: add deferred plane disabling")
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index 12dd261fc308d96d16dc995be628b9dbab38aa29..628de21c03d242f7283183b339bfc1e84d721a0f 100644 (file)
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -72,7 +72,7 @@ static void ipu_crtc_disable_planes(struct ipu_crtc *ipu_crtc,
        drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
                if (plane == &ipu_crtc->plane[0]->base)
                        disable_full = true;
-               if (&ipu_crtc->plane[1] && plane == &ipu_crtc->plane[1]->base)
+               if (ipu_crtc->plane[1] && plane == &ipu_crtc->plane[1]->base)
                        disable_partial = true;
        }