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

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Date:   Mon, 4 Jan 2021 19:23:53 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Chunyan Zhang <zhang.lyra@...il.com>
Cc:     Baolin Wang <baolin.wang7@...il.com>,
        Orson Zhai <orsonzhai@...il.com>, linux-i2c@...r.kernel.org,
        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 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!


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