linux-kernel - Re: [PATCH v2] i2c: sprd: use a specific timeout to avoid system hang up issue

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Message-ID: <CAAfSe-t-J3ckbwKjNuRpcm0wq7gme7YFG7fiHqLHk-Pu44jwZQ@mail.gmail.com>
Date:   Tue, 5 Jan 2021 10:13:29 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Wolfram Sang <wsa@...nel.org>
Cc:     Baolin Wang <baolin.wang7@...il.com>,
        Orson Zhai <orsonzhai@...il.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        Linhua Xu <linhua.xu@...soc.com>
Subject: Re: [PATCH v2] i2c: sprd: use a specific timeout to avoid system hang
 up issue

On Tue, 5 Jan 2021 at 02:24, Wolfram Sang <wsa@...nel.org> wrote:
>
> On Mon, Dec 14, 2020 at 12:58:50PM +0800, Chunyan Zhang wrote:
> > From: Chunyan Zhang <chunyan.zhang@...soc.com>
> >
> > If the i2c device SCL bus being pulled up due to some exception before
> > message transfer done, the system cannot receive the completing interrupt
> > signal any more, it would not exit waiting loop until MAX_SCHEDULE_TIMEOUT
> > jiffies eclipse, that would make the system seemed hang up. To avoid that
> > happen, this patch adds a specific timeout for message transfer.
> >
> > Fixes: 8b9ec0719834 ("i2c: Add Spreadtrum I2C controller driver")
> > Signed-off-by: Linhua Xu <linhua.xu@...soc.com>
> > Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
>
> Took the liberty to change the errno to ETIMEDOUT and applied to
> for-current, thanks!

Thanks!

Chunyan

>