linux-kernel - [PATCH v2 10/15] ACPI: platform_profile: Only show profiles common for all handlers

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Message-ID: <20241028020131.8031-11-mario.limonciello@amd.com>
Date: Sun, 27 Oct 2024 21:01:26 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Hans de Goede <hdegoede@...hat.com>, Ilpo Järvinen
	<ilpo.jarvinen@...ux.intel.com>
CC: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
	Maximilian Luz <luzmaximilian@...il.com>, Lee Chun-Yi <jlee@...e.com>, "Shyam
 Sundar S K" <Shyam-sundar.S-k@....com>, Corentin Chary
	<corentin.chary@...il.com>, "Luke D . Jones" <luke@...nes.dev>, Ike Panhc
	<ike.pan@...onical.com>, Henrique de Moraes Holschuh <hmh@....eng.br>,
	"Alexis Belmonte" <alexbelm48@...il.com>, Uwe Kleine-König
	<u.kleine-koenig@...gutronix.de>, Ai Chao <aichao@...inos.cn>, Gergo Koteles
	<soyer@....hu>, open list <linux-kernel@...r.kernel.org>, "open list:ACPI"
	<linux-acpi@...r.kernel.org>, "open list:MICROSOFT SURFACE PLATFORM PROFILE
 DRIVER" <platform-driver-x86@...r.kernel.org>, "open list:THINKPAD ACPI
 EXTRAS DRIVER" <ibm-acpi-devel@...ts.sourceforge.net>, Mark Pearson
	<mpearson-lenovo@...ebb.ca>, Matthew Schwartz <matthew.schwartz@...ux.dev>,
	Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v2 10/15] ACPI: platform_profile: Only show profiles common for all handlers

If multiple platform profile handlers have been registered, don't allow
switching to profiles unique to only one handler.

Tested-by: Matthew Schwartz <matthew.schwartz@...ux.dev>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/acpi/platform_profile.c | 35 ++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 5fee467614eac..a83842f05022b 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -33,30 +33,43 @@ static bool platform_profile_is_registered(void)
 	return count > 0;
 }
 
+/* expected to be called under mutex */
+static unsigned long platform_profile_get_choices(void)
+{
+	struct platform_profile_handler *handler;
+	unsigned long seen = 0;
+	int i;
+
+	list_for_each_entry(handler, &platform_profile_handler_list, list) {
+		for_each_set_bit(i, handler->choices, PLATFORM_PROFILE_LAST) {
+			if (seen & BIT(i))
+				continue;
+			seen |= BIT(i);
+		}
+	}
+
+	return seen;
+}
+
 static ssize_t platform_profile_choices_show(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
 {
+	unsigned long choices;
 	int len = 0;
-	int err, i;
-
-	err = mutex_lock_interruptible(&profile_lock);
-	if (err)
-		return err;
+	int i;
 
-	if (!cur_profile) {
-		mutex_unlock(&profile_lock);
-		return -ENODEV;
-	}
+	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock)
+		choices = platform_profile_get_choices();
 
-	for_each_set_bit(i, cur_profile->choices, PLATFORM_PROFILE_LAST) {
+	for_each_set_bit(i, &choices, PLATFORM_PROFILE_LAST) {
 		if (len == 0)
 			len += sysfs_emit_at(buf, len, "%s", profile_names[i]);
 		else
 			len += sysfs_emit_at(buf, len, " %s", profile_names[i]);
 	}
+
 	len += sysfs_emit_at(buf, len, "\n");
-	mutex_unlock(&profile_lock);
 	return len;
 }
 
-- 
2.43.0