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

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Message-Id: <1473929453-3533-5-git-send-email-bhe@redhat.com>
Date:   Thu, 15 Sep 2016 16:50:53 +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,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH 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 a9f78c2..461c2fe 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3581,7 +3581,7 @@ 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];
@@ -3595,7 +3595,7 @@ 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);
@@ -3608,7 +3608,7 @@ static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
 	if (!table->table) {
 		kfree(table);
 		table = NULL;
-		goto out;
+		goto out_unlock;
 	}
 
 	memset(table->table, 0, MAX_IRQS_PER_TABLE * sizeof(u32));
-- 
2.5.5