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

From: Wolfram Sang
Date: Mon Jan 04 2021 - 13:25:02 EST

On Mon, Dec 14, 2020 at 12:58:50PM +0800, Chunyan Zhang wrote:
> From: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>
> 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@xxxxxxxxxx>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>

Took the liberty to change the errno to ETIMEDOUT and applied to
for-current, thanks!

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