diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2022-02-23 15:13:03 +0200 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2022-02-25 19:06:27 +0200 |
| commit | cccc71b552a1040ad3d738d7ec95570801fb0bf6 (patch) | |
| tree | 4fcf3304ddb40b01370a4f8e7f3e226d041639f3 /drivers/gpu/drm/i915/display/intel_cursor.c | |
| parent | 53581504a8e216d435f114a4f2596ad0dfd902fc (diff) | |
| download | linux-cccc71b552a1040ad3d738d7ec95570801fb0bf6.tar.bz2 | |
drm/i915: Avoid negative shift due to bigjoiner_pipes==0
bigjoiner_pipes==0 leads bigjoiner_master_pipe() to
do BIT(ffs(0)-1) which is undefined behaviour. The code should
actually still work fine since the only place we provoke
that is intel_crtc_bigjoiner_slave_pipes() and it'll bitwise
AND the result with 0, so doesn't really matter what we get
out of bigjoiner_master_pipe(). But best not provoke undefined
behaviour anyway.
Reported-by: kernel test robot <oliver.sang@intel.com>
Fixes: a6e7a006f5d5 ("drm/i915: Change bigjoiner state tracking to use the pipe bitmask")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220223131315.18016-2-ville.syrjala@linux.intel.com
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_cursor.c')
0 files changed, 0 insertions, 0 deletions