Re: [PATCH] i2c: core: fix NULL pointer dereference in suspend/resume callbacks

[Marek Szyprowski]

Hi All,

On 22.05.2020 12:13, Marek Szyprowski wrote:
> Commit 6fe12cdbcfe3 ("i2c: core: support bus regulator controlling in
> adapter") added generic suspend and resume functions for i2c devices.
> Those functions unconditionally access an i2c_client structure assigned
> to the given i2c device. However, there exist i2c devices in the system
> without a valid i2c_client. Add the needed check before accessing the
> i2c_client.

Just one more comment. The devices without i2c_client structure are the 
i2c 'devices' associated with the respective i2c bus. They are visible 
in /sys:

ls -l /sys/bus/i2c/devices/i2c-*

I wonder if this patch has been ever tested with system suspend/resume, 
as those devices are always available in the system...

> ...

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland