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Re: NULL pointer dereference in cpufreq_update_limits(?) under Xen PV dom0 - regression in 6.13

To: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
From: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 27 Mar 2025 23:02:55 +0100
Cc: Jan Beulich <jbeulich@xxxxxxxx>, linux-pm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, regressions@xxxxxxxxxxxxxxx, Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Delivery-date: Thu, 27 Mar 2025 22:03:08 +0000
Feedback-id: i1568416f:Fastmail
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On Thu, Mar 27, 2025 at 12:02:24PM +0100, Rafael J. Wysocki wrote:
> cpufreq_update_limits() needs to ensure that the driver is there.
> 
> The attached patch should address this issue, Marek please verify.

Yes, it fixes the problem, thanks!

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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References:
- NULL pointer dereference in cpufreq_update_limits(?) under Xen PV dom0 - regression in 6.13
  - From: Marek Marczykowski-Górecki
- Re: NULL pointer dereference in cpufreq_update_limits(?) under Xen PV dom0 - regression in 6.13
  - From: Jan Beulich
- Re: NULL pointer dereference in cpufreq_update_limits(?) under Xen PV dom0 - regression in 6.13
  - From: Rafael J. Wysocki

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