[RFC,net,0/2] net/smc: Fix for race in smc link group termination

Message

Wen Gu Dec. 28, 2021, 9:20 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 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.

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(-)