[net,0/3] net/smc: Fixes for race in smc link group termination

Message

Wen Gu Jan. 10, 2022, 9:26 a.m. UTC

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(-)