From: Scott Wood <swood@redhat.com>
Date: Sun, 28 Jan 2018 14:22:19 -0600
Subject: iommu/amd: Don't use dev_data in irte_ga_set_affinity()
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
Git-commit: 94b25ada401a9a663eaa9096a148189473e7cf1d
Patch-mainline: Queued in subsystem maintainer repository
References: SLE Realtime Extension

Upstream commit 01ee04badefd296eb7a4430497373be9b7b16783

search_dev_data() acquires a non-raw lock, which can't be done
from atomic context on PREEMPT_RT.  There is no need to look at
dev_data because guest_mode should never be set if use_vapic is
not set.

Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Mike Galbraith <mgalbraith@suse.de>
---
 drivers/iommu/amd_iommu.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3860,10 +3860,8 @@ static void irte_ga_set_affinity(void *e
 				 u8 vector, u32 dest_apicid)
 {
 	struct irte_ga *irte = (struct irte_ga *) entry;
-	struct iommu_dev_data *dev_data = search_dev_data(devid);
 
-	if (!dev_data || !dev_data->use_vapic ||
-	    !irte->lo.fields_remap.guest_mode) {
+	if (!irte->lo.fields_remap.guest_mode) {
 		irte->hi.fields.vector = vector;
 		irte->lo.fields_remap.destination =
 					APICID_TO_IRTE_DEST_LO(dest_apicid);