netdev - [RFC PATCH net v2 0/2] net/smc: Fix for race in smc link group termination

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Message-Id: <1640704432-76825-1-git-send-email-guwen@linux.alibaba.com>
Date:   Tue, 28 Dec 2021 23:13:50 +0800
From:   Wen Gu <guwen@...ux.alibaba.com>
To:     kgraul@...ux.ibm.com, davem@...emloft.net, kuba@...nel.org
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, dust.li@...ux.alibaba.com,
        tonylu@...ux.alibaba.com
Subject: [RFC PATCH net v2 0/2] net/smc: Fix for race in smc link group termination

We encountered some crashes recently and they are caused by the
race between the access and free of link/link group in smc link
group termination. The crashes can be reproduced in frequent
abnormal link group termination, like set RNICs up/down.

This set of patches tries to fix this by extending the life cycle
of link/link group to ensure that they won't be referred to after
cleared or freed.

v1->v2
- Declare __smcr_link_clear() as 'static'

Best wishes,
Wen Gu

Wen Gu (2):
  net/smc: Resolve the race between link group access and termination
  net/smc: Resolve the race between SMC-R link access and clear

 net/smc/smc.h      |  1 +
 net/smc/smc_core.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++------
 net/smc/smc_core.h |  7 +++++
 3 files changed, 79 insertions(+), 9 deletions(-)

-- 
1.8.3.1