APPLIED[D]: [PATCH 0/1][SRU][B/B-OEM/C/D] Fix AMD IOMMU NULL dereference

[Seth Forshee]

On Wed, Mar 20, 2019 at 06:41:37PM +0800, Aaron Ma wrote:
> BugLink: https://bugs.launchpad.net/bugs/1820990
> 
> [Impact]
> When no acpi hid match the device, there will be a NULL dereference in
> amd iommu.
> It will make system hang.
> 
> [Fix]
> Check NULL pointer before using it.
> 
> [Test]
> Tested on several AMD platforms, bugs are fixed with this patch.
> 
> [Regression Potential]
> Low, upstream fix, Verified on several platforms.
> It should be safe.

Applied to disco/master-next, thanks!