[PATCH] drm/amd/amdgpu: Fix logic bug in fatal error handling

[Christian König]

Am 23.03.23 um 13:04 schrieb Srinivasan Shanmugam:
> CC      drivers/gpu/drm/amd/amdgpu/amdgpu_ras.o
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2567:28: error: bitwise or with non-zero value always evaluates to true [-Werror,-Wtautological-bitwise-compare]
>                if (adev->ras_hw_enabled | AMDGPU_RAS_BLOCK__DF)
>                    ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
>
> Presumably the author intended to test if AMDGPU_RAS_BLOCK__DF
> bit was set if ras is enabled, so that's what I'm changing the
> code to. Hopefully to do the right thing.

That looks like a nice catch to me, but I don't really know the ras code 
that well.

Hawking, Luben or whoever is more familiar with that should probably 
comment as well.

Christian.

>
> Cc: Christian König <christian.koenig at amd.com>
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Cc: Mario Limonciello <mario.limonciello at amd.com>
> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> index 5b17790218811..fac45f98145d8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> @@ -2564,7 +2564,7 @@ int amdgpu_ras_init(struct amdgpu_device *adev)
>   			adev->nbio.ras = &nbio_v7_4_ras;
>   		break;
>   	case IP_VERSION(4, 3, 0):
> -		if (adev->ras_hw_enabled | AMDGPU_RAS_BLOCK__DF)
> +		if (adev->ras_hw_enabled & AMDGPU_RAS_BLOCK__DF)
>   			/* unlike other generation of nbio ras,
>   			 * nbio v4_3 only support fatal error interrupt
>   			 * to inform software that DF is freezed due to