diff options
Diffstat (limited to 'drivers/base/power')
| -rw-r--r-- | drivers/base/power/runtime.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 1ef26216f971..5f9491ab6a43 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1191,10 +1191,12 @@ 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. @@ -1216,7 +1218,8 @@ 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 { @@ -1249,10 +1252,16 @@ 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) { |