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SUNRPC: Fix broken kthread_should_stop test in svc_get_next_xprt 

We should definitely not be exiting svc_get_next_xprt() with the
thread enqueued. Fix this by ensuring that we fall through to
the dequeue.
Also move the test itself outside the spin lock protected section.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2014-08-03 13:03:11 -04:00 committed by J. Bruce Fields
parent 983c684466
commit a4aa8054a6
1 changed files with 10 additions and 21 deletions
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31
net/sunrpc/svc_xprt.c
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@ -632,7 +632,7 @@ static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
{ {
struct svc_xprt *xprt; struct svc_xprt *xprt;
struct svc_pool *pool = rqstp->rq_pool; struct svc_pool *pool = rqstp->rq_pool;
long time_left; long time_left = 0;
/* Normally we will wait up to 5 seconds for any required /* Normally we will wait up to 5 seconds for any required
* cache information to be provided. * cache information to be provided.
@ -665,30 +665,19 @@ static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
/* No data pending. Go to sleep */ /* No data pending. Go to sleep */
svc_thread_enqueue(pool, rqstp); svc_thread_enqueue(pool, rqstp);
/*
* checking kthread_should_stop() here allows us to avoid
* locking and signalling when stopping kthreads that call
* svc_recv. If the thread has already been woken up, then
* we can exit here without sleeping. If not, then it
* it'll be woken up quickly during the schedule_timeout
*/
if (kthread_should_stop()) {
set_current_state(TASK_RUNNING);
xprt = ERR_PTR(-EINTR);
goto out;
}
spin_unlock_bh(&pool->sp_lock); spin_unlock_bh(&pool->sp_lock);
time_left = schedule_timeout(timeout); if (!(signalled() || kthread_should_stop())) {
__set_current_state(TASK_RUNNING); time_left = schedule_timeout(timeout);
__set_current_state(TASK_RUNNING);
try_to_freeze(); try_to_freeze();
xprt = rqstp->rq_xprt; xprt = rqstp->rq_xprt;
if (xprt != NULL) if (xprt != NULL)
return xprt; return xprt;
} else
__set_current_state(TASK_RUNNING);
spin_lock_bh(&pool->sp_lock); spin_lock_bh(&pool->sp_lock);
if (!time_left) if (!time_left)