linux-kernel - Re: [PATCH] drm/i915/psr: Fix unsigned expression compared with zero

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Date:   Wed, 22 Nov 2023 11:14:57 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     joonas.lahtinen@...ux.intel.com, rodrigo.vivi@...el.com,
        tvrtko.ursulin@...ux.intel.com, airlied@...il.com, daniel@...ll.ch,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Abaci Robot <abaci@...ux.alibaba.com>,
        Mika Kahola <mika.kahola@...el.com>
Subject: Re: [PATCH] drm/i915/psr: Fix unsigned expression compared with zero

On Wed, 22 Nov 2023, Jiapeng Chong <jiapeng.chong@...ux.alibaba.com> wrote:
> The entry_setup_frames is defined as u8 type, else(entry_setup_frames < 0)
> is invalid. At the same time, the return value of function
> intel_psr_entry_setup_frames is also of type int. so modified
> its type to int.
>
> ./drivers/gpu/drm/i915/display/intel_psr.c:1336:5-23: WARNING: Unsigned expression compared with zero: entry_setup_frames >= 0.
>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7610
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>

There's already a patch. Mika, please follow up with it.

https://patchwork.freedesktop.org/patch/msgid/20231116090512.480373-1-mika.kahola@intel.com

> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index 8d180132a74b..204da50e3f28 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1319,7 +1319,7 @@ static bool _psr_compute_config(struct intel_dp *intel_dp,
>  {
>  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
>  	const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
> -	u8 entry_setup_frames;
> +	int entry_setup_frames;
>  
>  	/*
>  	 * Current PSR panels don't work reliably with VRR enabled

-- 
Jani Nikula, Intel