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 and view. Then, we replace pm_runtime_resume_and_get with it in fec_main.c to avoid it.
[0]https://lkml.org/lkml/2020/6/14/88 [1]https://patchwork.ozlabs.org/project/linux-tegra/list/?series=178139 Zhang Qilong (2): PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter net: fec: Fix reference count leak in fec series ops drivers/net/ethernet/freescale/fec_main.c | 12 +++++------- include/linux/pm_runtime.h | 21 +++++++++++++++++++++ 2 files changed, 26 insertions(+), 7 deletions(-) -- 2.25.4
