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authorZhang Qilong <zhangqilong3@huawei.com>2020-11-10 12:29:32 +0300
committerJakub Kicinski <kuba@kernel.org>2020-11-16 20:37:01 +0300
commitdd8088d5a8969dc2b42f71d7bc01c25c61a78066 (patch)
tree6f52ae44199e5ea0a6d1eadf08c43228b86a3274 /include/linux/pm_runtime.h
parente2142ef266c8a25e635ae4319254d7c01c84deb7 (diff)
downloadlinux-dd8088d5a8969dc2b42f71d7bc01c25c61a78066.tar.xz
PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter
In many case, we need to check return value of pm_runtime_get_sync, but it brings a trouble to the usage counter processing. Many callers forget to decrease the usage counter when it failed, which could resulted in reference leak. It has been discussed a lot[0][1]. So we add a function to deal with the usage counter for better coding. [0]https://lkml.org/lkml/2020/6/14/88 [1]https://patchwork.ozlabs.org/project/linux-tegra/list/?series=178139 Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/linux/pm_runtime.h')
-rw-r--r--include/linux/pm_runtime.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index 4b708f4e8eed..b492ae00cc90 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -387,6 +387,27 @@ static inline int pm_runtime_get_sync(struct device *dev)
}
/**
+ * pm_runtime_resume_and_get - Bump up usage counter of a device and resume it.
+ * @dev: Target device.
+ *
+ * Resume @dev synchronously and if that is successful, increment its runtime
+ * PM usage counter. Return 0 if the runtime PM usage counter of @dev has been
+ * incremented or a negative error code otherwise.
+ */
+static inline int pm_runtime_resume_and_get(struct device *dev)
+{
+ int ret;
+
+ ret = __pm_runtime_resume(dev, RPM_GET_PUT);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
* pm_runtime_put - Drop device usage counter and queue up "idle check" if 0.
* @dev: Target device.
*