linux-kernel - [PATCH RESEND 4/4] iommu/amd: No need to wait iommu completion if no dte irq entry change

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Message-ID: <20160920010534.GA11495@x1.redhat.com>
Date:   Tue, 20 Sep 2016 09:05:34 +0800
From:   Baoquan He <bhe@...hat.com>
To:     joro@...tes.org
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        dyoung@...hat.com, xlpang@...hat.com, Vincent.Wan@....com
Subject: [PATCH RESEND 4/4] iommu/amd: No need to wait iommu completion if no
 dte irq entry change

This is a clean up. In get_irq_table() only if DTE entry is changed
iommu_completion_wait() need be called. Otherwise no need to do it.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 drivers/iommu/amd_iommu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b5b117b..a2479d0 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3634,7 +3634,7 @@ static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
 
 	table = irq_lookup_table[devid];
 	if (table)
-		goto out;
+		goto out_unlock;
 
 	alias = amd_iommu_alias_table[devid];
 	table = irq_lookup_table[alias];
@@ -3648,7 +3648,7 @@ static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
 	/* Nothing there yet, allocate new irq remapping table */
 	table = kzalloc(sizeof(*table), GFP_ATOMIC);
 	if (!table)
-		goto out;
+		goto out_unlock;
 
 	/* Initialize table spin-lock */
 	spin_lock_init(&table->lock);
@@ -3661,7 +3661,7 @@ static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
 	if (!table->table) {
 		kfree(table);
 		table = NULL;
-		goto out;
+		goto out_unlock;
 	}
 
 	if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
-- 
2.5.5