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SubjectRe: [PATCH] amdgpu: fix integer overflow on 32-bit architectures
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Am 05.05.20 um 16:15 schrieb Arnd Bergmann:
> Multiplying 1000000000 by four overruns a 'long' variable, as clang
> points out:
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:4160:53: error: overflow in expression; result is -294967296 with type 'long' [-Werror,-Winteger-overflow]
> expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4L;
> ^
> Make this a 'long long' constant instead.
>
> Fixes: 3f12acc8d6d4 ("drm/amdgpu: put the audio codec into suspend state before gpu reset V3")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Reviewed-by: Christian König <christian.koenig@amd.com>

> ---
> I'm not sure the ktime_get_mono_fast_ns() call is necessary here
> either. Is it intentional because ktime_get_ns() doesn't work
> during a driver suspend, or just a mistake?
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 6f93af972b0a..2e07e3e6b036 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -4157,7 +4157,7 @@ static int amdgpu_device_suspend_display_audio(struct amdgpu_device *adev)
> * the audio controller default autosuspend delay setting.
> * 4S used here is guaranteed to cover that.
> */
> - expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4L;
> + expires = ktime_get_mono_fast_ns() + NSEC_PER_SEC * 4LL;
>
> while (!pm_runtime_status_suspended(&(p->dev))) {
> if (!pm_runtime_suspend(&(p->dev)))

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