linux-kernel - [PATCH v2] drm/i915/tv: avoid possible division by zero

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Date:   Tue, 18 Jul 2023 09:32:17 +0800
From:   Su Hui <suhui@...china.com>
To:     jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        airlied@...il.com, daniel@...ll.ch, nathan@...nel.org,
        ndesaulniers@...gle.com, trix@...hat.com, andrzej.hajda@...el.com
Cc:     ville.syrjala@...ux.intel.com, lyude@...hat.com,
        mripard@...nel.org, suhui@...china.com,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        kernel-janitors@...r.kernel.org
Subject: [PATCH v2] drm/i915/tv: avoid possible division by zero

Clang warning: drivers/gpu/drm/i915/display/intel_tv.c:
line 991, column 22 Division by zero.
Assuming tv_mode->oversample=1 and (!tv_mode->progressive)=1,
then division by zero will happen.

Fixes: 1bba5543e4fe ("drm/i915: Fix TV encoder clock computation")
Signed-off-by: Su Hui <suhui@...china.com>
---
 drivers/gpu/drm/i915/display/intel_tv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_tv.c b/drivers/gpu/drm/i915/display/intel_tv.c
index 36b479b46b60..f59553f7c132 100644
--- a/drivers/gpu/drm/i915/display/intel_tv.c
+++ b/drivers/gpu/drm/i915/display/intel_tv.c
@@ -988,7 +988,7 @@ intel_tv_mode_to_mode(struct drm_display_mode *mode,
 		      const struct tv_mode *tv_mode,
 		      int clock)
 {
-	mode->clock = clock / (tv_mode->oversample >> !tv_mode->progressive);
+	mode->clock = clock / tv_mode->oversample << !tv_mode->progressive;
 
 	/*
 	 * tv_mode horizontal timings:
-- 
2.30.2