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iommu/amd: Don't use dev_data in irte_ga_set_affinity() 

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>
This commit is contained in:
Scott Wood 2018-01-28 14:22:19 -06:00 committed by Joerg Roedel
parent 27790398c2
commit 01ee04bade
1 changed files with 1 additions and 3 deletions
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4
drivers/iommu/amd_iommu.c
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@ -3877,10 +3877,8 @@ static void irte_ga_set_affinity(void *entry, u16 devid, u16 index,
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 = dest_apicid;
modify_irte_ga(devid, index, irte, NULL);