Re: [APS-24624] Missing patch in K5.15 against kernel panic

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Dec 10, 2024 at 02:23:35PM +0100, Bilge Aydin wrote:
> Dear Linux community,
> 
> I am leading a project at Samsung where we utilized your kernel 5.15 in our system. Recently we faced an important kernel panic issue whose fix must be following patch:
> https://lore.kernel.org/all/1946ef9f774851732eed78760a78ec40dbc6d178.1667591503.git.robin.murphy@arm.com/
> 
> The problem for us is that this patch must be available from kernel 6.1 onwards. 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/iommu/iommu.c?h=v6.1.119 
> Clear to us is that it is not integrated into K5.15 yet: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/iommu/iommu.c?h=v5.15.173 
> 
> On the other side we can see that this patch was already applied to Android Common Kernel android13-5.15  https://android-review.googlesource.com/q/I51dbcdc5dc536b0e69c6187b2d7ac6a2031a305b. In particular, we can see the same implementation in the recent ACK release https://android.googlesource.com/kernel/common/+/refs/tags/android13-5.15-2024-11_r2/drivers/iommu/iommu.c  given on https://source.android.com/docs/core/architecture/kernel/gki-android13-5_15-release-builds 
> 
> Do you have any plan to adjust your implementation in drivers/iommu/iommu.c in K5.15 as present in K6.1? If not, since the issue in our project is very critical for us, may I ask you kindly to trigger the sync of K5.15 and K6.1 soon?

If you wish for a commit to be backported to the stable kernels, just
ask us, and better yet, provide a working patch to do so.

The reason we did NOT backport this specific commit is that it is marked
as a fix for a commit that shows up in the 6.1 release, so why would it
be applicable to 5.15.y at all?  So why do you feel it is required in
5.15.y?  (Note, we have no idea why it's in an Android kernel tree,
perhaps they have the offending commit in there as well so the backport
is required?  Have you checked?)

If you need or want it applied to older kernels, please send us a
working patch and we will be glad to take it.

thanks,

greg k-h