linux-kernel - Re: i2c-designware: NULL ptr at RIP: 0010:regmap

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Date: Tue, 2 Jan 2024 15:42:30 +0200
From: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To: Borislav Petkov <bp@...en8.de>, linux-i2c@...r.kernel.org
Cc: lkml <linux-kernel@...r.kernel.org>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Jan Dabros <jsd@...ihalf.com>, Andi Shyti <andi.shyti@...nel.org>,
 Mario Limonciello <mario.limonciello@....com>, narasimhan.v@....com
Subject: Re: i2c-designware: NULL ptr at RIP: 0010:regmap_read+0x12/0x70

Hi

On 12/29/23 14:08, Borislav Petkov wrote:
> Looking at the call stack, I see
> 
>    2409205acd3c ("i2c: designware: fix __i2c_dw_disable() in case master is holding SCL low")
> 
> which does that dev->map deref in __i2c_dw_disable() but maybe ->map is
> invalid by then...?
> 
> Just a stab in the dark anyway...
> 
Do you run same tests on vanilla? I.e. do you see this on v6.7-rc8?

I'm curious to know is this already existing issue or regression because 
of recent cleanup patches in linux-next between v6.7-rc8.. 
drivers/i2c/busses/i2c-designware-*.