linux-kernel - [PATCH] iommu: Remove duplicate check of pasids

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Message-ID: <1617275956-4467-1-git-send-email-liuqi115@huawei.com>
Date:   Thu, 1 Apr 2021 19:19:16 +0800
From:   Qi Liu <liuqi115@...wei.com>
To:     <will@...nel.org>, <joro@...tes.org>
CC:     <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>
Subject: [PATCH] iommu: Remove duplicate check of pasids

Remove duplicate check of pasids in amd_iommu_domain_enable_v2(), as it
has been guaranteed in amd_iommu_init_device().

Signed-off-by: Qi Liu <liuqi115@...wei.com>
---
 drivers/iommu/amd/iommu.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 107316e..7ca9f2f 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2310,9 +2310,6 @@ int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
 	unsigned long flags;
 	int levels, ret;
 
-	if (pasids <= 0 || pasids > (PASID_MASK + 1))
-		return -EINVAL;
-
 	/* Number of GCR3 table levels required */
 	for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9)
 		levels += 1;
-- 
2.8.1