linux-kernel - Re: [PATCH v1 1/1] mfd: intel-lpss: Fix too early PM enablement in the ACPI ->probe()

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Date:   Mon, 1 Nov 2021 21:00:23 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Aditya Garg <gargaditya08@...e.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Orlando Chamberlain <redecorating@...tonmail.com>
Subject: Re: [PATCH v1 1/1] mfd: intel-lpss: Fix too early PM enablement in
 the ACPI ->probe()

On Mon, Nov 01, 2021 at 06:21:51PM +0000, Aditya Garg wrote:
> > On 01-Nov-2021, at 8:40 PM, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> > 
> > The runtime PM callback may be called as soon as the runtime PM facility
> > is enabled and activated. It means that ->suspend() may be called before
> > we finish probing the device in the ACPI case. Hence, NULL pointer
> > dereference:
> > 
> >  intel-lpss INT34BA:00: IRQ index 0 not found
> >  BUG: kernel NULL pointer dereference, address: 0000000000000030
> >  ...
> >  Workqueue: pm pm_runtime_work
> >  RIP: 0010:intel_lpss_suspend+0xb/0x40 [intel_lpss]
> > 
> > To fix this, first try to register the device and only after that enable
> > runtime PM facility.

> Following patch fixed the issue for me.
> Tested-by: Aditya Garg <gargaditya08@...e.com>

Thanks for testing!


-- 
With Best Regards,
Andy Shevchenko