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sunrpc: Fix lockd sleeping until timeout

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There is a race in enqueueing thread to a pool and
waking up a thread.
lockd doesn't wake up on reception of lock granted callback
if svc_wake_up() is called before lockd's thread is added
to a pool.

Signed-off-by: Andriy Skulysh <Andriy_Skulysh@xyratex.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Andriy Skulysh 2013-01-07 00:12:15 +02:00 committed by J. Bruce Fields
parent 624ab46448
commit 35525b7978
2 changed files with 9 additions and 1 deletions
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1
include/linux/sunrpc/svc.h
View file

@ -50,6 +50,7 @@ struct svc_pool {
unsigned int sp_nrthreads; /* # of threads in pool */
struct list_head sp_all_threads; /* all server threads */
struct svc_pool_stats sp_stats; /* statistics on pool operation */
int sp_task_pending;/* has pending task */
} ____cacheline_aligned_in_smp;
/*

9
net/sunrpc/svc_xprt.c
View file

@ -499,7 +499,8 @@ void svc_wake_up(struct svc_serv *serv)
rqstp->rq_xprt = NULL;
*/
wake_up(&rqstp->rq_wait);
}
} else
pool->sp_task_pending = 1;
spin_unlock_bh(&pool->sp_lock);
}
}
@ -634,7 +635,13 @@ struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
* long for cache updates.
*/
rqstp->rq_chandle.thread_wait = 1*HZ;
pool->sp_task_pending = 0;
} else {
if (pool->sp_task_pending) {
pool->sp_task_pending = 0;
spin_unlock_bh(&pool->sp_lock);
return ERR_PTR(-EAGAIN);
}
/* No data pending. Go to sleep */
svc_thread_enqueue(pool, rqstp);