linux-kernel - Re: [PATCH] dma-buf: call dma_buf_stats

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Message-ID: <1c9b7f5a-7658-cf93-4d17-7d8e4b168932@amd.com>
Date:   Tue, 10 May 2022 11:31:39 +0200
From:   Christian König <christian.koenig@....com>
To:     Charan Teja Kalla <quic_charante@...cinc.com>,
        "T.J. Mercier" <tjmercier@...gle.com>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Hridya Valsaraju <hridya@...gle.com>, daniel.vetter@...ll.ch,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-buf: call dma_buf_stats_setup after dmabuf is in
 valid list

Am 10.05.22 um 04:43 schrieb Charan Teja Kalla:
> Hello Mercier,
>
> On 5/10/2022 3:19 AM, T.J. Mercier wrote:
>> On Mon, May 9, 2022 at 12:50 PM Charan Teja Kalla
>> <quic_charante@...cinc.com> wrote:
>>> From: Charan Teja Reddy <quic_charante@...cinc.com>
>>>
>>> When dma_buf_stats_setup() fails, it closes the dmabuf file which
>>> results into the calling of dma_buf_file_release() where it does
>>> list_del(&dmabuf->list_node) with out first adding it to the proper
>>> list. This is resulting into panic in the below path:
>>> __list_del_entry_valid+0x38/0xac
>>> dma_buf_file_release+0x74/0x158
>>> __fput+0xf4/0x428
>>> ____fput+0x14/0x24
>>> task_work_run+0x178/0x24c
>>> do_notify_resume+0x194/0x264
>>> work_pending+0xc/0x5f0
>>>
>>> Fix it by moving the dma_buf_stats_setup() after dmabuf is added to the
>>> list.
>>>
>>> Fixes: bdb8d06dfefd ("dmabuf: Add the capability to expose DMA-BUF stats in sysfs")
>>> Signed-off-by: Charan Teja Reddy <quic_charante@...cinc.com>
>> Tested-by: T.J. Mercier <tjmercier@...gle.com>
>> Acked-by: T.J. Mercier <tjmercier@...gle.com>
>>
> Thanks for the Ack. Also Realized that it should have:
> Cc: <stable@...r.kernel.org> # 5.15.x+

Reviewed and pushed to drm-misc-fixes.

Thanks,
Christian.