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Subject: Re: i2c-designware: NULL ptr at RIP: 0010:regmap_read+0x12/0x70
To: Borislav Petkov <bp@alien8.de>, linux-i2c@vger.kernel.org
Cc: lkml <linux-kernel@vger.kernel.org>,
 Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
 Mika Westerberg <mika.westerberg@linux.intel.com>,
 Jan Dabros <jsd@semihalf.com>, Andi Shyti <andi.shyti@kernel.org>,
 Mario Limonciello <mario.limonciello@amd.com>, narasimhan.v@amd.com
References: <20231229120820.GCZY62tM7z4v2XmOAZ@fat_crate.local>
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From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
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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-*.