linux-kernel - Re: [RESEND][PATCH 1/3] dma-buf: system_heap: Make sure to return an error if we abort

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Message-ID: <CAO_48GHfGPqcX8B7BC5tf0J3+RWrtjpgHpfnJ-+sVaNv3bxYiw@mail.gmail.com>
Date:   Thu, 21 Jan 2021 18:58:57 +0530
From:   Sumit Semwal <sumit.semwal@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...nel.org>,
        Brian Starkey <Brian.Starkey@....com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        Chris Goldsworthy <cgoldswo@...eaurora.org>,
        Ørjan Eide <orjan.eide@....com>,
        Robin Murphy <robin.murphy@....com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Simon Ser <contact@...rsion.fr>,
        James Jones <jajones@...dia.com>,
        "open list:DMA BUFFER SHARING FRAMEWORK" 
        <linux-media@...r.kernel.org>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: [RESEND][PATCH 1/3] dma-buf: system_heap: Make sure to return an
 error if we abort

Hi John,

On Wed, 20 Jan 2021 at 02:15, John Stultz <john.stultz@...aro.org> wrote:
>
> If we abort from the allocation due to a fatal_signal_pending(),
> be sure we report an error so any return code paths don't trip
> over the fact that the allocation didn't succeed.

Thanks for the patch; LGTM, will push into drm-misc-next.
>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: Liam Mark <lmark@...eaurora.org>
> Cc: Laura Abbott <labbott@...nel.org>
> Cc: Brian Starkey <Brian.Starkey@....com>
> Cc: Hridya Valsaraju <hridya@...gle.com>
> Cc: Suren Baghdasaryan <surenb@...gle.com>
> Cc: Sandeep Patil <sspatil@...gle.com>
> Cc: Daniel Mentz <danielmentz@...gle.com>
> Cc: Chris Goldsworthy <cgoldswo@...eaurora.org>
> Cc: Ørjan Eide <orjan.eide@....com>
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: Ezequiel Garcia <ezequiel@...labora.com>
> Cc: Simon Ser <contact@...rsion.fr>
> Cc: James Jones <jajones@...dia.com>
> Cc: linux-media@...r.kernel.org
> Cc: dri-devel@...ts.freedesktop.org
> Suggested-by: Suren Baghdasaryan <surenb@...gle.com>
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  drivers/dma-buf/heaps/system_heap.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c
> index 17e0e9a68baf..405351aad2a8 100644
> --- a/drivers/dma-buf/heaps/system_heap.c
> +++ b/drivers/dma-buf/heaps/system_heap.c
> @@ -363,8 +363,10 @@ static int system_heap_allocate(struct dma_heap *heap,
>                  * Avoid trying to allocate memory if the process
>                  * has been killed by SIGKILL
>                  */
> -               if (fatal_signal_pending(current))
> +               if (fatal_signal_pending(current)) {
> +                       ret = -EINTR;
>                         goto free_buffer;
> +               }
>
>                 page = alloc_largest_available(size_remaining, max_order);
>                 if (!page)
> --
> 2.17.1
>

Best,
Sumit.