PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter
authorZhang Qilong <zhangqilong3@huawei.com>
Tue, 10 Nov 2020 09:29:32 +0000 (17:29 +0800)
committerJakub Kicinski <kuba@kernel.org>
Mon, 16 Nov 2020 17:37:01 +0000 (09:37 -0800)
commitdd8088d5a8969dc2b42f71d7bc01c25c61a78066
tree6f52ae44199e5ea0a6d1eadf08c43228b86a3274
parente2142ef266c8a25e635ae4319254d7c01c84deb7
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>
include/linux/pm_runtime.h