linux-kernel - Re: [PATCH v4 4/6] dma-buf: dma_fence

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Date:   Thu, 15 Sep 2022 14:06:16 +0200
From:   Christian König <christian.koenig@....com>
To:     Arvind Yadav <Arvind.Yadav@....com>, andrey.grodzovsky@....com,
        shashank.sharma@....com, amaranath.somalapuram@....com,
        Arunpravin.PaneerSelvam@....com, sumit.semwal@...aro.org,
        gustavo@...ovan.org, airlied@...ux.ie, daniel@...ll.ch,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/6] dma-buf: dma_fence_wait must enable signaling

Am 14.09.22 um 18:43 schrieb Arvind Yadav:
> dma_fence_wait() should always enable signaling even
> when the fence is already signaled.
>
> Signed-off-by: Arvind Yadav <Arvind.Yadav@....com>

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

> ---
>
> Changes in v1..v3: This new patch was not part of previous series.
>
> ---
>
>   drivers/dma-buf/dma-fence.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
> index 645c158b7e01..a5fbf1c1e0ea 100644
> --- a/drivers/dma-buf/dma-fence.c
> +++ b/drivers/dma-buf/dma-fence.c
> @@ -508,6 +508,8 @@ dma_fence_wait_timeout(struct dma_fence *fence, bool intr, signed long timeout)
>   
>   	__dma_fence_might_wait();
>   
> +	dma_fence_enable_sw_signaling(fence);
> +
>   	trace_dma_fence_wait_start(fence);
>   	if (fence->ops->wait)
>   		ret = fence->ops->wait(fence, intr, timeout);
> @@ -771,9 +773,6 @@ dma_fence_default_wait(struct dma_fence *fence, bool intr, signed long timeout)
>   		goto out;
>   	}
>   
> -	if (!__dma_fence_enable_signaling(fence))
> -		goto out;
> -
>   	if (!timeout) {
>   		ret = 0;
>   		goto out;