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From: Kalle Valo <kvalo@codeaurora.org>
To: Loic Poulain <loic.poulain@linaro.org>
Cc: linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	Hemant Kumar <hemantk@codeaurora.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Subject: Re: [PATCH] mhi: Fix double dma free
Date: Tue, 09 Feb 2021 19:02:06 +0200	[thread overview]
Message-ID: <87tuqltbsh.fsf@codeaurora.org> (raw)
In-Reply-To: <CAMZdPi9xRTrhkZ+q4db0GKZb+AcJ9YXY_-_wTO6KNROCxipj0g@mail.gmail.com> (Loic Poulain's message of "Tue, 9 Feb 2021 16:55:04 +0100")

Loic Poulain <loic.poulain@linaro.org> writes:

> Hi Kalle,
>
> On Tue, 9 Feb 2021 at 16:45, Loic Poulain <loic.poulain@linaro.org> wrote:
>>
>> mhi_deinit_chan_ctxt functionthat takes care of unitializing channel
>> resources, including unmapping coherent MHI areas, can be called
>> from different path in case of controller unregistering/removal:
>>  - From a client driver remove callback, via mhi_unprepare_channel
>>  - From mhi_driver_remove that unitialize all channels
>>
>> mhi_driver_remove()
>> |-> driver->remove()
>> |    |-> mhi_unprepare_channel()
>> |        |-> mhi_deinit_chan_ctxt()
>> |...
>> |-> mhi_deinit_chan_ctxt()
>>
>> This leads to double dma freeing...
>>
>> Fix that by preventing deinit for already uninitialized channel.
>>
>> Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
>> Reported-by: Kalle Valo <kvalo@codeaurora.org>
>
> This is a 'blind' fix tentative, can you please check if it resolves
> the issue on your side?

I did a quick test few times and I don't see any crashes anymore, thanks!

Tested-by: Kalle Valo <kvalo@codeaurora.org>

And like Jeffrey said:

Fixes: a7f422f2f89e ("bus: mhi: Fix channel close issue on driver remove")

Is it too late to push this to v5.11? But this should go to v5.12.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

  reply	other threads:[~2021-02-09 17:04 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-09 15:53 [PATCH] mhi: Fix double dma free Loic Poulain
2021-02-09 15:55 ` Loic Poulain
2021-02-09 17:02   ` Kalle Valo [this message]
2021-02-09 15:55 ` Jeffrey Hugo
2021-02-09 16:06   ` Loic Poulain
2021-02-09 17:27     ` Bhaumik Bhatt
2021-02-09 18:17       ` Loic Poulain
2021-02-10  4:37         ` Bhaumik Bhatt
2021-02-10  8:17           ` Manivannan Sadhasivam
  -- strict thread matches above, loose matches on Subject: below --
2021-02-09 15:52 Loic Poulain

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