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drm/modes: Switch to 64bit maths to avoid integer overflow

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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>
This commit is contained in:
Ville Syrjälä 2020-10-22 22:42:56 +03:00
parent 625f8fb5bb
commit 5b34ab5240
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/drm_modes.c
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@ -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);