linux-kernel - [PATCH] iommu/vt-d: remove redundant variable no_platform

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Date:   Wed,  4 Nov 2020 16:19:36 +0800
From:   Zhenzhong Duan <zhenzhong.duan@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     dwmw2@...radead.org, baolu.lu@...ux.intel.com, joro@...tes.org,
        iommu@...ts.linux-foundation.org,
        Zhenzhong Duan <zhenzhong.duan@...il.com>
Subject: [PATCH] iommu/vt-d: remove redundant variable no_platform_optin

no_platform_optin is redundant with dmar_disabled and it's only used in
platform_optin_force_iommu(), remove it and use dmar_disabled instead.

Meanwhile remove all the dead code in platform_optin_force_iommu().

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...il.com>
---
 drivers/iommu/intel/iommu.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 8651f6d4dfa0..a011d1ed63ef 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -180,7 +180,6 @@ static int rwbf_quirk;
  */
 static int force_on = 0;
 int intel_iommu_tboot_noforce;
-static int no_platform_optin;
 
 #define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry))
 
@@ -440,7 +439,6 @@ static int __init intel_iommu_setup(char *str)
 			pr_info("IOMMU enabled\n");
 		} else if (!strncmp(str, "off", 3)) {
 			dmar_disabled = 1;
-			no_platform_optin = 1;
 			pr_info("IOMMU disabled\n");
 		} else if (!strncmp(str, "igfx_off", 8)) {
 			dmar_map_gfx = 0;
@@ -4810,20 +4808,12 @@ static inline bool has_external_pci(void)
 
 static int __init platform_optin_force_iommu(void)
 {
-	if (!dmar_platform_optin() || no_platform_optin || !has_external_pci())
+	if (!dmar_platform_optin() || dmar_disabled || !has_external_pci())
 		return 0;
 
-	if (no_iommu || dmar_disabled)
+	if (no_iommu)
 		pr_info("Intel-IOMMU force enabled due to platform opt in\n");
 
-	/*
-	 * If Intel-IOMMU is disabled by default, we will apply identity
-	 * map for all devices except those marked as being untrusted.
-	 */
-	if (dmar_disabled)
-		iommu_set_default_passthrough(false);
-
-	dmar_disabled = 0;
 	no_iommu = 0;
 
 	return 1;
-- 
2.25.1