From c2af7545aaff3495d9bf9a7608c52f0af86fb194 Mon Sep 17 00:00:00 2001 From: Christof Schmitt Date: Mon, 21 Jun 2010 10:11:32 +0200 Subject: [SCSI] zfcp: Do not wait for SBALs on stopped queue Trying to read the FC host statistics on an offline adapter results in a 5 seconds wait. Reading the statistics tries to issue an exchange port data request which first waits up to 5 seconds for an entry in the request queue. Change the strategy for getting a free SBAL to exit when the queue is stopped. Reading the statistics will then fail without the wait. Reviewed-by: Swen Schillig Signed-off-by: Christof Schmitt Signed-off-by: James Bottomley --- drivers/s390/scsi/zfcp_qdio.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'drivers/s390/scsi/zfcp_qdio.c') diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c index 28117e130e2..6fa5e045317 100644 --- a/drivers/s390/scsi/zfcp_qdio.c +++ b/drivers/s390/scsi/zfcp_qdio.c @@ -251,7 +251,8 @@ static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio) struct zfcp_qdio_queue *req_q = &qdio->req_q; spin_lock_bh(&qdio->req_q_lock); - if (atomic_read(&req_q->count)) + if (atomic_read(&req_q->count) || + !(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) return 1; spin_unlock_bh(&qdio->req_q_lock); return 0; @@ -274,8 +275,13 @@ int zfcp_qdio_sbal_get(struct zfcp_qdio *qdio) spin_unlock_bh(&qdio->req_q_lock); ret = wait_event_interruptible_timeout(qdio->req_q_wq, zfcp_qdio_sbal_check(qdio), 5 * HZ); + + if (!(atomic_read(&qdio->adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) + return -EIO; + if (ret > 0) return 0; + if (!ret) { atomic_inc(&qdio->req_q_full); /* assume hanging outbound queue, try queue recovery */ @@ -375,6 +381,8 @@ void zfcp_qdio_close(struct zfcp_qdio *qdio) atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status); spin_unlock_bh(&qdio->req_q_lock); + wake_up(&qdio->req_q_wq); + qdio_shutdown(qdio->adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR); -- cgit v1.2.3-70-g09d2