Merge tag 'iommu-fixes-v3.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:
"Three fixes for the AMD IOMMU driver:
- fix a locking issue around get_user_pages()
- fix two issues with device aliasing and exclusion range handling"

* tag 'iommu-fixes-v3.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
iommu/amd: fix enabling exclusion range for an exact device
iommu/amd: Take mmap_sem when calling get_user_pages
iommu/amd: Fix interrupt remapping for aliased devices

drivers/iommu/amd_iommu.c

···
 	iommu_flush_dte(iommu, devid);
 	if (devid != alias) {
 		irq_lookup_table[alias] = table;
-		set_dte_irq_entry(devid, table);
+		set_dte_irq_entry(alias, table);
 		iommu_flush_dte(iommu, alias);
 	}
 

drivers/iommu/amd_iommu_init.c

···
 		 * per device. But we can enable the exclusion range per
 		 * device. This is done here
 		 */
-		set_dev_entry_bit(m->devid, DEV_ENTRY_EX);
+		set_dev_entry_bit(devid, DEV_ENTRY_EX);
 		iommu->exclusion_start = m->range_start;
 		iommu->exclusion_length = m->range_length;
 	}

drivers/iommu/amd_iommu_v2.c

···
 
 	write = !!(fault->flags & PPR_FAULT_WRITE);
 
+	down_read(&fault->state->mm->mmap_sem);
 	npages = get_user_pages(fault->state->task, fault->state->mm,
 				fault->address, 1, write, 0, &page, NULL);
+	up_read(&fault->state->mm->mmap_sem);
 
 	if (npages == 1) {
 		put_page(page);