[PATCH 1/2] amdgpu: fix overflow for timeout calculation

[Ernst Sjöstrand]

I guess the patches should be for drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
instead?

Regards
//Ernst

2015-11-21 1:24 GMT+01:00 Alex Deucher <alexdeucher at gmail.com>:

> From: Jammy Zhou <Jammy.Zhou at amd.com>
>
> Set the timeout to AMDGPU_TIMEOUT_INFINITE when overflow happens
>
> Signed-off-by: Jammy Zhou <Jammy.Zhou at amd.com>
> Reviewed-by: Christian König <christian.koenig at amd.com>
> ---
>  amdgpu/amdgpu_cs.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/amdgpu/amdgpu_cs.c b/amdgpu/amdgpu_cs.c
> index 4da9821..aa594c4 100644
> --- a/amdgpu/amdgpu_cs.c
> +++ b/amdgpu/amdgpu_cs.c
> @@ -289,12 +289,16 @@ drm_private uint64_t
> amdgpu_cs_calculate_timeout(uint64_t timeout)
>
>         if (timeout != AMDGPU_TIMEOUT_INFINITE) {
>                 struct timespec current;
> +               uint64_t current_ns;
>                 r = clock_gettime(CLOCK_MONOTONIC, &current);
>                 if (r)
>                         return r;
>
> -               timeout += ((uint64_t)current.tv_sec) * 1000000000ull;
> -               timeout += current.tv_nsec;
> +               current_ns = ((uint64_t)current.tv_sec) * 1000000000ull;
> +               current_ns += current.tv_nsec;
> +               timeout += current_ns;
> +               if (timeout < current_ns)
> +                       timeout = AMDGPU_TIMEOUT_INFINITE;
>         }
>         return timeout;
>  }
> --
> 1.8.3.1
>
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