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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2025-08-28 17:31:16 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2025-08-28 17:31:16 +0300
commite9d62f8040fec2b66776782988bd243897678b03 (patch)
tree01cbf974af35893bf42b9860ee0234c790420b1b /drivers/base
parent1b39e7de5f4110f0dfda32693b968ab7709977ec (diff)
parent11a24528d080a6ac23f07d6031da9e271728d62d (diff)
downloadlinux-rolling-lts.tar.xz
Merge v6.12.44linux-rolling-lts
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/runtime.c27
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 317505eab126..c7ec69597a95 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1183,10 +1183,12 @@ EXPORT_SYMBOL_GPL(__pm_runtime_resume);
*
* Return -EINVAL if runtime PM is disabled for @dev.
*
- * Otherwise, if the runtime PM status of @dev is %RPM_ACTIVE and either
- * @ign_usage_count is %true or the runtime PM usage counter of @dev is not
- * zero, increment the usage counter of @dev and return 1. Otherwise, return 0
- * without changing the usage counter.
+ * Otherwise, if its runtime PM status is %RPM_ACTIVE and (1) @ign_usage_count
+ * is set, or (2) @dev is not ignoring children and its active child count is
+ * nonero, or (3) the runtime PM usage counter of @dev is not zero, increment
+ * the usage counter of @dev and return 1.
+ *
+ * Otherwise, return 0 without changing the usage counter.
*
* If @ign_usage_count is %true, this function can be used to prevent suspending
* the device when its runtime PM status is %RPM_ACTIVE.
@@ -1208,7 +1210,8 @@ static int pm_runtime_get_conditional(struct device *dev, bool ign_usage_count)
retval = -EINVAL;
} else if (dev->power.runtime_status != RPM_ACTIVE) {
retval = 0;
- } else if (ign_usage_count) {
+ } else if (ign_usage_count || (!dev->power.ignore_children &&
+ atomic_read(&dev->power.child_count) > 0)) {
retval = 1;
atomic_inc(&dev->power.usage_count);
} else {
@@ -1241,10 +1244,16 @@ EXPORT_SYMBOL_GPL(pm_runtime_get_if_active);
* @dev: Target device.
*
* Increment the runtime PM usage counter of @dev if its runtime PM status is
- * %RPM_ACTIVE and its runtime PM usage counter is greater than 0, in which case
- * it returns 1. If the device is in a different state or its usage_count is 0,
- * 0 is returned. -EINVAL is returned if runtime PM is disabled for the device,
- * in which case also the usage_count will remain unmodified.
+ * %RPM_ACTIVE and its runtime PM usage counter is greater than 0 or it is not
+ * ignoring children and its active child count is nonzero. 1 is returned in
+ * this case.
+ *
+ * If @dev is in a different state or it is not in use (that is, its usage
+ * counter is 0, or it is ignoring children, or its active child count is 0),
+ * 0 is returned.
+ *
+ * -EINVAL is returned if runtime PM is disabled for the device, in which case
+ * also the usage counter of @dev is not updated.
*/
int pm_runtime_get_if_in_use(struct device *dev)
{