linux-kernel - Re: [PATCH 6.12 000/140] 6.12.48-rc1 review

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Message-ID: <58d213af-f422-4b70-8821-9777fc1b7020@roeck-us.net>
Date: Sat, 18 Oct 2025 21:38:55 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: stable@...r.kernel.org, patches@...ts.linux.dev,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, shuah@...nel.org, patches@...nelci.org,
	lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
	f.fainelli@...il.com, sudipm.mukherjee@...il.com,
	srw@...dewatkins.net, rwarsow@....de, conor@...nel.org,
	hargar@...rosoft.com, broonie@...nel.org, achill@...ill.org,
	Yi Sun <yi.sun@...el.com>
Subject: Re: [PATCH 6.12 000/140] 6.12.48-rc1 review

Hi,

On Wed, Sep 17, 2025 at 02:32:52PM +0200, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 6.12.48 release.
> There are 140 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
> 
> Responses should be made by Fri, 19 Sep 2025 12:32:53 +0000.
> Anything received after that time might be too late.
> 
...
> 
> Yi Sun <yi.sun@...el.com>
>     dmaengine: idxd: Fix refcount underflow on module unload
> 

This misses a cleanup call to idxd_disable_sva() if device_user_pasid_enabled()
is true. This results in a warning backtrace seen when unloading and reloading
the idxd driver. Upstream does not have the problem because support for
IOMMU_DEV_FEAT_IOPF and with it the cleanup call was removed there.

This is just a notification. I'll send a patch fixing the problem later.

Guenter