linux-kernel - [PATCH net 0/3] net/smc: Fixes for race in smc link group termination

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Message-Id: <1641806784-93141-1-git-send-email-guwen@linux.alibaba.com>
Date:   Mon, 10 Jan 2022 17:26:21 +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
Subject: [PATCH net 0/3] net/smc: Fixes 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 abnormal
smc link group termination. The crashes can be reproduced in
frequent abnormal link group termination, like setting 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.

Wen Gu (3):
  net/smc: Resolve the race between link group access and termination
  net/smc: Introduce a new conn->lgr validity check helper
  net/smc: Resolve the race between SMC-R link access and clear

 net/smc/af_smc.c   |  6 +++-
 net/smc/smc.h      |  1 +
 net/smc/smc_cdc.c  |  3 +-
 net/smc/smc_clc.c  |  2 +-
 net/smc/smc_core.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++--------
 net/smc/smc_core.h | 12 +++++++
 net/smc/smc_diag.c |  6 ++--
 7 files changed, 104 insertions(+), 20 deletions(-)

-- 
1.8.3.1