linux-kernel - [PATCH 10/10] iommu/amd: Remove redundant devid checks

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Message-Id: <20200527115313.7426-11-joro@8bytes.org>
Date:   Wed, 27 May 2020 13:53:13 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        jroedel@...e.de
Subject: [PATCH 10/10] iommu/amd: Remove redundant devid checks

From: Joerg Roedel <jroedel@...e.de>

Checking the return value of get_device_id() in a code-path which has
already done check_device() is not needed, as check_device() does the
same check and bails out if it fails.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/amd/iommu.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 2504aa184837..db149c1a35bf 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -413,13 +413,8 @@ static void iommu_ignore_device(struct device *dev)
 static void amd_iommu_uninit_device(struct device *dev)
 {
 	struct iommu_dev_data *dev_data;
-	int devid;
-
-	devid = get_device_id(dev);
-	if (devid < 0)
-		return;
 
-	dev_data = search_dev_data(devid);
+	dev_data = dev_iommu_priv_get(dev);
 	if (!dev_data)
 		return;
 
@@ -2173,16 +2168,12 @@ static void amd_iommu_probe_finalize(struct device *dev)
 
 static void amd_iommu_release_device(struct device *dev)
 {
+	int devid = get_device_id(dev);
 	struct amd_iommu *iommu;
-	int devid;
 
 	if (!check_device(dev))
 		return;
 
-	devid = get_device_id(dev);
-	if (devid < 0)
-		return;
-
 	iommu = amd_iommu_rlookup_table[devid];
 
 	amd_iommu_uninit_device(dev);
-- 
2.17.1