netdev - [PATCH v3 0/2] Fix usage counter leak by adding a general sync ops

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Date:   Tue, 10 Nov 2020 17:29:31 +0800
From:   Zhang Qilong <zhangqilong3@...wei.com>
To:     <rjw@...ysocki.net>, <fugang.duan@....com>, <davem@...emloft.net>,
        <kuba@...nel.org>
CC:     <linux-pm@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH v3 0/2] Fix usage counter leak by adding a general sync ops

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