From: Arnd Bergmann Date: Mon, 4 Dec 2017 14:44:23 +0000 (+0100) Subject: drm/msm: avoid false-positive -Wmaybe-uninitialized warning X-Git-Tag: v4.16-rc1~96^2~8^2~11 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=a1ed6def4410451eeb2ce85b4270e6fe9d3c902c;p=linux.git drm/msm: avoid false-positive -Wmaybe-uninitialized warning gcc-8 -fsanitize-coverage=trace-pc produces a false-positive warning: drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c: In function 'mdp5_plane_mode_set.isra.8': drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c:1053:3: error: 'crtc_x_r' may be used uninitialized in this function [-Werror=maybe-uninitialized] It's relatively clear from reading the source that this cannot happen, and older compilers get it right. This rearranges the code remove the two affected variables, which reliably avoids the problem. Signed-off-by: Arnd Bergmann Acked-by: Laurent Pinchart Signed-off-by: Rob Clark --- diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c index ee41423baeb7..29678876fc09 100644 --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c @@ -966,8 +966,6 @@ static int mdp5_plane_mode_set(struct drm_plane *plane, uint32_t src_x, src_y; uint32_t src_w, src_h; uint32_t src_img_w, src_img_h; - uint32_t src_x_r; - int crtc_x_r; int ret; nplanes = fb->format->num_planes; @@ -1012,9 +1010,6 @@ static int mdp5_plane_mode_set(struct drm_plane *plane, crtc_w /= 2; src_w /= 2; src_img_w /= 2; - - crtc_x_r = crtc_x + crtc_w; - src_x_r = src_x + src_w; } ret = calc_scalex_steps(plane, pix_format, src_w, crtc_w, step.x); @@ -1054,9 +1049,9 @@ static int mdp5_plane_mode_set(struct drm_plane *plane, if (right_hwpipe) mdp5_hwpipe_mode_set(mdp5_kms, right_hwpipe, fb, &step, &pe, config, hdecm, vdecm, hflip, vflip, - crtc_x_r, crtc_y, crtc_w, crtc_h, + crtc_x + crtc_w, crtc_y, crtc_w, crtc_h, src_img_w, src_img_h, - src_x_r, src_y, src_w, src_h); + src_x + src_w, src_y, src_w, src_h); plane->fb = fb;