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drm/i915/backlight: Fix divide by 0 error in i9xx_set_backlight

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pwm_level_max maybe 0 we do throw a warning but move ahead with
execution which may later cause a /0 error.

--v2
-return if the warn_on gets hit [Jani]

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://lore.kernel.org/r/20250819160438.145734-1-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal 2025-08-19 21:34:39 +05:30
parent 9b1795e9b0
commit 11c09b55b3
1 changed files with 2 additions and 1 deletions
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drivers/gpu/drm/i915/display/intel_backlight.c
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@ -236,7 +236,8 @@ static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32
struct intel_panel *panel = &connector->panel;
u32 tmp, mask;
drm_WARN_ON(display->drm, panel->backlight.pwm_level_max == 0);
if (drm_WARN_ON(display->drm, panel->backlight.pwm_level_max == 0))
return;
if (panel->backlight.combination_mode) {
struct pci_dev *pdev = to_pci_dev(display->drm->dev);