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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2020-10-22 22:42:56 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2021-01-14 19:37:53 +0200 |
| commit | 5b34ab52401f0f1f191bcb83a182c83b506f4763 (patch) | |
| tree | 2e203df4a861ebcce829f09b0755ac4adf65a0a4 /drivers/gpu/drm/drm_modes.c | |
| parent | 625f8fb5bb5f5d25731c98d1f02e5023d41385f3 (diff) | |
| download | linux-5b34ab52401f0f1f191bcb83a182c83b506f4763.tar.gz linux-5b34ab52401f0f1f191bcb83a182c83b506f4763.tar.bz2 linux-5b34ab52401f0f1f191bcb83a182c83b506f4763.zip | |
drm/modes: Switch to 64bit maths to avoid integer overflow
The new >8k CEA modes have dotclocks reaching 5.94 GHz, which
means our clock*1000 will now overflow the 32bit unsigned
integer. Switch to 64bit maths to avoid it.
Cc: stable@vger.kernel.org
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201022194256.30978-1-ville.syrjala@linux.intel.com
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
| -rw-r--r-- | drivers/gpu/drm/drm_modes.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c index 33fb2f05ce66..1ac67d4505e0 100644 --- a/drivers/gpu/drm/drm_modes.c +++ b/drivers/gpu/drm/drm_modes.c @@ -762,7 +762,7 @@ int drm_mode_vrefresh(const struct drm_display_mode *mode) if (mode->htotal == 0 || mode->vtotal == 0) return 0; - num = mode->clock * 1000; + num = mode->clock; den = mode->htotal * mode->vtotal; if (mode->flags & DRM_MODE_FLAG_INTERLACE) @@ -772,7 +772,7 @@ int drm_mode_vrefresh(const struct drm_display_mode *mode) if (mode->vscan > 1) den *= mode->vscan; - return DIV_ROUND_CLOSEST(num, den); + return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den); } EXPORT_SYMBOL(drm_mode_vrefresh); |