linux-kernel - [PATCH 1/2] iommu/vt-d: Remove the dead code in init_iommu

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Date:   Tue, 30 May 2023 17:25:02 +0800
From:   Yanfei Xu <yanfei.xu@...el.com>
To:     dwmw2@...radead.org, baolu.lu@...ux.intel.com, joro@...tes.org,
        will@...nel.org, robin.murphy@....com
Cc:     iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        yanfei.xu@...el.com
Subject: [PATCH 1/2] iommu/vt-d: Remove the dead code in init_iommu_hw()

After 'commit 2a41ccee2fdc ("iommu/vt-d: Change
iommu_enable/disable_translation to return void")', init_iommu_hw() only
returns 0. If statement for return value of this function is meaningless.
Hence change init_iommu_hw() to return viod and remove the dead code of
if statement in init_iommu_hw()

Signed-off-by: Yanfei Xu <yanfei.xu@...el.com>
---
 drivers/iommu/intel/iommu.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 8096273b034c..e98f1b122b49 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2963,7 +2963,7 @@ static void __init init_no_remapping_devices(void)
 }
 
 #ifdef CONFIG_SUSPEND
-static int init_iommu_hw(void)
+static void init_iommu_hw(void)
 {
 	struct dmar_drhd_unit *drhd;
 	struct intel_iommu *iommu = NULL;
@@ -2988,8 +2988,6 @@ static int init_iommu_hw(void)
 		iommu_enable_translation(iommu);
 		iommu_disable_protect_mem_regions(iommu);
 	}
-
-	return 0;
 }
 
 static void iommu_flush_all(void)
@@ -3051,13 +3049,7 @@ static void iommu_resume(void)
 	struct intel_iommu *iommu = NULL;
 	unsigned long flag;
 
-	if (init_iommu_hw()) {
-		if (force_on)
-			panic("tboot: IOMMU setup failed, DMAR can not resume!\n");
-		else
-			WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
-		return;
-	}
+	init_iommu_hw();
 
 	for_each_active_iommu(iommu, drhd) {
 
-- 
2.34.1