linux-kernel - [PATCH 38/39] iommu/amd: drop null test before destroy functions

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Date:	Sun, 13 Sep 2015 14:15:31 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Joerg Roedel <joro@...tes.org>
Cc:	sergey.senozhatsky@...il.com, kernel-janitors@...r.kernel.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 38/39] iommu/amd: drop null test before destroy functions

Remove unneeded NULL test.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@ expression x; @@
-if (x != NULL) {
  \(kmem_cache_destroy\|mempool_destroy\|dma_pool_destroy\)(x);
  x = NULL;
-}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/iommu/amd_iommu_init.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 5ef347a..5fb59cc 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1755,11 +1755,8 @@ static void __init free_on_init_error(void)
 	free_pages((unsigned long)irq_lookup_table,
 		   get_order(rlookup_table_size));
 
-	if (amd_iommu_irq_cache) {
-		kmem_cache_destroy(amd_iommu_irq_cache);
-		amd_iommu_irq_cache = NULL;
-
-	}
+	kmem_cache_destroy(amd_iommu_irq_cache);
+	amd_iommu_irq_cache = NULL;
 
 	free_pages((unsigned long)amd_iommu_rlookup_table,
 		   get_order(rlookup_table_size));

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