If multiple platform profile handlers have been registered, don't allow
switching to profiles unique to only one handler.
Tested-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
Tested-by: Matthew Schwartz <matthew.schwartz@xxxxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
v5:
* adjust mutex use
---
drivers/acpi/platform_profile.c | 59 ++++++++++++++++++++++++---------
1 file changed, 44 insertions(+), 15 deletions(-)
diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
index 510e1435d3980..2ae0437623abb 100644
--- a/drivers/acpi/platform_profile.c
+++ b/drivers/acpi/platform_profile.c
@@ -231,27 +231,56 @@ static const struct class platform_profile_class = {
.dev_groups = profile_groups,
};
+/**
+ * _aggregate_choices - Aggregate the available profile choices
+ * @dev: The device
+ * @data: The available profile choices
+ * Return: 0 on success, -errno on failure
+ */
+static int _aggregate_choices(struct device *dev, void *data)
+{
+ unsigned long *aggregate = data;
+ unsigned long choices = 0;
+ int err;
+
+ err = _get_class_choices(dev, &choices);
+ if (err)
+ return err;
+
+ if (!*aggregate)
+ *aggregate = choices;
+ else
+ *aggregate &= choices;
+
+ return 0;
+}
+
+/**
+ * platform_profile_choices_show - Show the available profile choices for legacy sysfs interface
+ * @dev: The device
+ * @attr: The attribute
+ * @buf: The buffer to write to
+ * Return: The number of bytes written
+ */
static ssize_t platform_profile_choices_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+ struct device_attribute *attr,
+ char *buf)
{
- int len = 0;
- int i;
+ unsigned long aggregate = 0;
+ int err;
scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
- if (!cur_profile)
- return -ENODEV;
-
- for_each_set_bit(i, cur_profile->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]);
- }
+ err = class_for_each_device(&platform_profile_class, NULL,
+ &aggregate, _aggregate_choices);
+ if (err)
+ return err;
}
- len += sysfs_emit_at(buf, len, "\n");
- return len;
+ /* no profile handler registered any more */
+ if (!aggregate)
+ return -EINVAL;
+
+ return _commmon_choices_show(aggregate, buf);
}
static ssize_t platform_profile_show(struct device *dev,
--
2.43.0
