linux-kernel - [PATCH v2 03/14] platform/x86/intel/ifs: Remove image loading during init

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Date:   Mon,  7 Nov 2022 14:53:12 -0800
From:   Jithu Joseph <jithu.joseph@...el.com>
To:     hdegoede@...hat.com, markgross@...nel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        gregkh@...uxfoundation.org, jithu.joseph@...el.com,
        ashok.raj@...el.com, tony.luck@...el.com,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        patches@...ts.linux.dev, ravi.v.shankar@...el.com,
        thiago.macieira@...el.com, athenas.jimenez.gonzalez@...el.com,
        sohil.mehta@...el.com
Subject: [PATCH v2 03/14] platform/x86/intel/ifs: Remove image loading during init

IFS test image is unnecessarily loaded during driver initialization.
Drop image loading during ifs_init() and improve module load time.
With this change, user has to load one when starting the tests.

As a consequence, make ifs_sem static as it is only used within sysfs.c

Reviewed-by: Tony Luck <tony.luck@...el.com>
Suggested-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Jithu Joseph <jithu.joseph@...el.com>
---
 drivers/platform/x86/intel/ifs/ifs.h   | 2 --
 drivers/platform/x86/intel/ifs/core.c  | 6 +-----
 drivers/platform/x86/intel/ifs/sysfs.c | 2 +-
 3 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/x86/intel/ifs/ifs.h b/drivers/platform/x86/intel/ifs/ifs.h
index 73c8e91cf144..3ff1d9aaeaa9 100644
--- a/drivers/platform/x86/intel/ifs/ifs.h
+++ b/drivers/platform/x86/intel/ifs/ifs.h
@@ -229,6 +229,4 @@ void ifs_load_firmware(struct device *dev);
 int do_core_test(int cpu, struct device *dev);
 const struct attribute_group **ifs_get_groups(void);
 
-extern struct semaphore ifs_sem;
-
 #endif
diff --git a/drivers/platform/x86/intel/ifs/core.c b/drivers/platform/x86/intel/ifs/core.c
index 27204e3d674d..5fb7f655c291 100644
--- a/drivers/platform/x86/intel/ifs/core.c
+++ b/drivers/platform/x86/intel/ifs/core.c
@@ -51,12 +51,8 @@ static int __init ifs_init(void)
 	ifs_device.misc.groups = ifs_get_groups();
 
 	if ((msrval & BIT(ifs_device.data.integrity_cap_bit)) &&
-	    !misc_register(&ifs_device.misc)) {
-		down(&ifs_sem);
-		ifs_load_firmware(ifs_device.misc.this_device);
-		up(&ifs_sem);
+	    !misc_register(&ifs_device.misc))
 		return 0;
-	}
 
 	return -ENODEV;
 }
diff --git a/drivers/platform/x86/intel/ifs/sysfs.c b/drivers/platform/x86/intel/ifs/sysfs.c
index 37d8380d6fa8..65dd6fea5342 100644
--- a/drivers/platform/x86/intel/ifs/sysfs.c
+++ b/drivers/platform/x86/intel/ifs/sysfs.c
@@ -13,7 +13,7 @@
  * Protects against simultaneous tests on multiple cores, or
  * reloading can file while a test is in progress
  */
-DEFINE_SEMAPHORE(ifs_sem);
+static DEFINE_SEMAPHORE(ifs_sem);
 
 /*
  * The sysfs interface to check additional details of last test
-- 
2.25.1