linux-kernel - Re: [PATCH 2/4] spi: spi-qcom-qspi: Use GFP_ATOMIC flag while allocating for descriptor

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Message-ID: <CAD=FV=Wb4_q7xL_ec=_=bQodb0dy18HQzY=E855mZ1r+5G36uQ@mail.gmail.com>
Date:   Tue, 25 Jul 2023 10:58:03 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        broonie@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_msavaliy@...cinc.com, mka@...omium.org, swboyd@...omium.org,
        quic_vtanuku@...cinc.com, dan.carpenter@...aro.org
Subject: Re: [PATCH 2/4] spi: spi-qcom-qspi: Use GFP_ATOMIC flag while
 allocating for descriptor

Hi,

On Tue, Jul 25, 2023 at 4:48 AM Vijaya Krishna Nivarthi
<quic_vnivarth@...cinc.com> wrote:
>
> While allocating for DMA descriptor, GFP_KERNEL flag is being used and
> this allocation happens within critical section with spinlock acquired.
> This generates a static checker warning.
>
> Use GFP_ATOMIC to prevent sleeping; and since this increases chances of
> allocation failure, add handling accordingly.
>
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/all/abc223e8-44af-40bb-a0bd-9865b393f435@moroto.mountain/
> Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
> ---
>  drivers/spi/spi-qcom-qspi.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)

Fixes: b5762d95607e ("spi: spi-qcom-qspi: Add DMA mode support")
Reviewed-by: Douglas Anderson <dianders@...omium.org>