From: Jacob Pan jacob.jun.pan@linux.intel.com
[ Upstream commit 39d630e332144028f56abba83d94291978e72df1 ]
PASID allocator uses IDR which is exclusive for the end of the allocation range. There is no need to decrement pasid_max.
Fixes: af39507305fb ("iommu/vt-d: Apply global PASID in SVA") Reported-by: Eric Auger eric.auger@redhat.com Signed-off-by: Jacob Pan jacob.jun.pan@linux.intel.com Reviewed-by: Eric Auger eric.auger@redhat.com Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/intel-svm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index fd8730b2cd46e..5944d3b4dca37 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -377,7 +377,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_ /* Do not use PASID 0 in caching mode (virtualised IOMMU) */ ret = intel_pasid_alloc_id(svm, !!cap_caching_mode(iommu->cap), - pasid_max - 1, GFP_KERNEL); + pasid_max, GFP_KERNEL); if (ret < 0) { kfree(svm); kfree(sdev);