Hi Rahul,
On 09/03/2021 18:19, Rahul Singh wrote:
Backport 588888a7399db352d2b1a41c9d5b3bf0fd482390
"iommu/arm-smmu: Intelligent SMR allocation" from the Linux kernel
This patch fix the stream match conflict issue when two devices have the
same stream-id.
Only difference while applying this patch is to use spinlock in place of
mutex and move iommu_group_alloc(..) function call in
arm_smmu_add_device(..) function from the start of the function
to the end.
As you may remember the discussion on the SMMUv3 thread, replacing a
spinlock by a mutex has consequences. Can you explain why this is fine?
Cheers,
--
Julien Grall
