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staging: lustre: avoid race during lnet acceptor thread termination

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This patch will avoid potential race, around socket sleepers
wait list, during acceptor thread termination and using
sk_callback_lock RW-Lock protection.

Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6476
Reviewed-on: http://review.whamcloud.com/14503
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bruno Faccini 2016-02-22 17:29:21 -05:00 • committed by Greg Kroah-Hartman
commit 0cf56a1a99
1 changed files with 7 additions and 1 deletions
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8
drivers/staging/lustre/lnet/lnet/acceptor.c
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@ -488,11 +488,17 @@ lnet_acceptor_start(void)
void
lnet_acceptor_stop(void)
{
struct sock *sk;
if (lnet_acceptor_state.pta_shutdown) /* not running */
return;
lnet_acceptor_state.pta_shutdown = 1;
wake_up_all(sk_sleep(lnet_acceptor_state.pta_sock->sk));
sk = lnet_acceptor_state.pta_sock->sk;
/* awake any sleepers using safe method */
sk->sk_state_change(sk);
/* block until acceptor signals exit */
wait_for_completion(&lnet_acceptor_state.pta_signal);