tree cfb1127e6a552d864506126f6dfc6186d8b3357c
parent d92c0da71a35dfddccca7bfa932829504311359e
author Bart Van Assche <bvanassche@acm.org> 1413907235 +0200
committer Christoph Hellwig <hch@lst.de> 1415790324 +0100

IB/srp: Fix a race condition triggered by destroying a queue pair

At least LID reassignment can trigger a race condition in the SRP
initiator driver, namely the receive completion handler trying to
post a request on a QP during or after QP destruction and before
the CQ's have been destroyed. Avoid this race by modifying a QP
into the error state and by waiting until all receive completions
have been processed before destroying a QP.

Reported-by: Max Gurtuvoy <maxg@mellanox.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>