33 lines
1.2 KiB
Diff
33 lines
1.2 KiB
Diff
From: Scott Wood <swood@redhat.com>
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Date: Sun, 28 Jan 2018 14:22:19 -0600
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Subject: [PATCH 2/3] iommu/amd: Don't use dev_data in irte_ga_set_affinity()
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.16/older/patches-4.16.7-rt1.tar.xz
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Upstream commit 01ee04badefd296eb7a4430497373be9b7b16783
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search_dev_data() acquires a non-raw lock, which can't be done
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from atomic context on PREEMPT_RT. There is no need to look at
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dev_data because guest_mode should never be set if use_vapic is
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not set.
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Signed-off-by: Scott Wood <swood@redhat.com>
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Signed-off-by: Joerg Roedel <jroedel@suse.de>
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---
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drivers/iommu/amd_iommu.c | 4 +---
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1 file changed, 1 insertion(+), 3 deletions(-)
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--- a/drivers/iommu/amd_iommu.c
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+++ b/drivers/iommu/amd_iommu.c
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@@ -3877,10 +3877,8 @@ static void irte_ga_set_affinity(void *e
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u8 vector, u32 dest_apicid)
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{
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struct irte_ga *irte = (struct irte_ga *) entry;
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- struct iommu_dev_data *dev_data = search_dev_data(devid);
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- if (!dev_data || !dev_data->use_vapic ||
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- !irte->lo.fields_remap.guest_mode) {
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+ if (!irte->lo.fields_remap.guest_mode) {
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irte->hi.fields.vector = vector;
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irte->lo.fields_remap.destination = dest_apicid;
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modify_irte_ga(devid, index, irte, NULL);
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