linux-kernel - Re: [PATCH] i2c: tegra: Fix the check during DMA channel release

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Date:   Mon, 17 Jul 2023 17:24:15 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Akhil R <akhilrajeev@...dia.com>
Cc:     christian.koenig@....com, digetx@...il.com, jonathanh@...dia.com,
        ldewangan@...dia.com, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        sumit.semwal@...aro.org, wsa@...nel.org
Subject: Re: [PATCH] i2c: tegra: Fix the check during DMA channel release

On Mon, Jul 17, 2023 at 08:42:40PM +0530, Akhil R wrote:
> Check for error and NULL before attempting to release DMA channel.
> 
> This, otherwise, was causing panic and crash in kernel when the
> dma_chan has an invalid value. The condition occurs during init_dma()
> when the dma_request_chan() function returns an error.
> 
> Fixes: fcc8a89a1c83 ("i2c: tegra: Share same DMA channel for RX and TX")
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

There's already another patch on the list that should address this:

	https://patchwork.ozlabs.org/project/linux-tegra/patch/20230707132619.2998382-1-thierry.reding@gmail.com/

Can you please test and provide feedback on that one?

Thanks,
Thierry

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