linux-kernel - Re: [PATCH] drm/amdgpu: initialize amdgpu_ras_query_error

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Message-ID: <a836cafa-86a9-3d72-1f02-f9f2d58ee127@amd.com>
Date:   Fri, 2 Jul 2021 18:51:27 -0400
From:   Luben Tuikov <luben.tuikov@....com>
To:     trix@...hat.com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...ux.ie,
        daniel@...ll.ch, Hawking.Zhang@....com, Dennis.Li@....com,
        guchun.chen@....com, Stanley.Yang@....com, nirmoy.das@....com
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        "Tuikov, Luben" <Luben.Tuikov@....com>
Subject: Re: [PATCH] drm/amdgpu: initialize amdgpu_ras_query_error_count()
 error count parameters

That's a good find, but I'd rather functions have no side effects. I'll follow up with a patch which correctly fixes this.

Regards,
Luben

On 2021-07-02 3:52 p.m., trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
>
> Static analysis reports this problem
> amdgpu_ras.c:2324:2: warning: 2nd function call argument is an
>   uninitialized value
>         atomic_set(&con->ras_ce_count, ce_count);
>         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> ce_count is normally set by the earlier call to
> amdgpu_ras_query_error_count().  But amdgpu_ras_query_error_count()
> can return early without setting, leaving its error count parameters
> in a garbage state.
>
> Initialize the error count parameters earlier.
>
> Fixes: a46751fbcde5 ("drm/amdgpu: Fix RAS function interface")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> index 875874ea745ec..c80fa545aa2b8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> @@ -1056,6 +1056,12 @@ void amdgpu_ras_query_error_count(struct amdgpu_device *adev,
>  	struct ras_manager *obj;
>  	unsigned long ce, ue;
>  
> +	if (ce_count)
> +		*ce_count = 0;
> +
> +	if (ue_count)
> +		*ue_count = 0;
> +
>  	if (!adev->ras_enabled || !con)
>  		return;
>