linux-kernel - [RFC v2 2/2] platform/x86: dell-sysman: Improve instance detection

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Message-Id: <20230426212848.108562-3-W_Armin@gmx.de>
Date:   Wed, 26 Apr 2023 23:28:48 +0200
From:   Armin Wolf <W_Armin@....de>
To:     hdegoede@...hat.com, markgross@...nel.org
Cc:     Mario.Limonciello@....com, prasanth.ksr@...l.com,
        jorgealtxwork@...il.com, james@...iv.tech,
        Dell.Client.Kernel@...l.com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC v2 2/2] platform/x86: dell-sysman: Improve instance detection

The WMI driver core already knows how many WMI object instances
are available, use this information instead of probing the WMI object
manually.

Compile-tested only.

Signed-off-by: Armin Wolf <W_Armin@....de>
---
 .../platform/x86/dell/dell-wmi-sysman/sysman.c    | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c b/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
index 0285b47d99d1..526d60b510bb 100644
--- a/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
+++ b/drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
@@ -7,6 +7,7 @@

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

+#include <linux/acpi.h>
 #include <linux/fs.h>
 #include <linux/dmi.h>
 #include <linux/module.h>
@@ -303,16 +304,14 @@ union acpi_object *get_wmiobj_pointer(int instance_id, const char *guid_string)
  */
 int get_instance_count(const char *guid_string)
 {
-	union acpi_object *wmi_obj = NULL;
-	int i = 0;
+	acpi_status status;
+	u8 instance_count;

-	do {
-		kfree(wmi_obj);
-		wmi_obj = get_wmiobj_pointer(i, guid_string);
-		i++;
-	} while (wmi_obj);
+	status = wmi_instance_count(guid_string, &instance_count);
+	if (ACPI_FAILURE(status))
+		return 0;

-	return (i-1);
+	return instance_count;
 }

 /**
--
2.30.2