[PATCH v3 18/22] ACPI: platform_profile: Make sure all profile handlers agree on profile

[Mario Limonciello <mario.limonciello@xxxxxxx>]

If for any reason multiple profile handlers don't agree on the profile
report the custom profile to userspace.

Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/acpi/platform_profile.c | 39 +++++++++++++++++++++++++++------
 1 file changed, 32 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 3128bd16615b6..5baac1f9a9c0e 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -51,6 +51,36 @@ static unsigned long platform_profile_get_choices(void)
 	return aggregate;
 }
 
+static int platform_profile_get_active(enum platform_profile_option *profile)
+{
+	struct platform_profile_handler *handler;
+	enum platform_profile_option active = PLATFORM_PROFILE_LAST;
+	enum platform_profile_option val;
+	int err;
+
+	lockdep_assert_held(&profile_lock);
+	list_for_each_entry(handler, &platform_profile_handler_list, list) {
+		err = handler->profile_get(handler, &val);
+		if (err) {
+			pr_err("Failed to get profile for handler %s\n", handler->name);
+			return err;
+		}
+
+		if (WARN_ON(val >= PLATFORM_PROFILE_LAST))
+			return -EINVAL;
+
+		if (active != val && active != PLATFORM_PROFILE_LAST) {
+			*profile = PLATFORM_PROFILE_CUSTOM;
+			return 0;
+		}
+		active = val;
+	}
+
+	*profile = active;
+
+	return 0;
+}
+
 static ssize_t platform_profile_choices_show(struct device *dev,
 					struct device_attribute *attr,
 					char *buf)
@@ -81,18 +111,13 @@ static ssize_t platform_profile_show(struct device *dev,
 	int err;
 
 	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
-		if (!cur_profile)
+		if (!platform_profile_is_registered())
 			return -ENODEV;
-
-		err = cur_profile->profile_get(cur_profile, &profile);
+		err = platform_profile_get_active(&profile);
 		if (err)
 			return err;
 	}
 
-	/* Check that profile is valid index */
-	if (WARN_ON((profile < 0) || (profile >= ARRAY_SIZE(profile_names))))
-		return -EIO;
-
 	return sysfs_emit(buf, "%s\n", profile_names[profile]);
 }
 
-- 
2.43.0