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| author | Christof Schmitt <christof.schmitt@de.ibm.com> | 2010-06-21 10:11:32 +0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2010-07-21 15:05:07 -0700 |
| commit | c2af7545aaff3495d9bf9a7608c52f0af86fb194 (patch) | |
| tree | 9a30d2da8ecabc075f46424cd4c20290b6b9b5ec | |
| parent | 30b6777b8931afc5f3aa42858fe917938b570f79 (diff) | |
| download | linux-3.10-c2af7545aaff3495d9bf9a7608c52f0af86fb194.tar.gz linux-3.10-c2af7545aaff3495d9bf9a7608c52f0af86fb194.tar.bz2 linux-3.10-c2af7545aaff3495d9bf9a7608c52f0af86fb194.zip | |
[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 <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
| -rw-r--r-- | drivers/s390/scsi/zfcp_fsf.c | 5 | ||||
| -rw-r--r-- | drivers/s390/scsi/zfcp_qdio.c | 10 |
2 files changed, 9 insertions, 6 deletions
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c index 4e15361a83b..229795f190e 100644 --- a/drivers/s390/scsi/zfcp_fsf.c +++ b/drivers/s390/scsi/zfcp_fsf.c @@ -719,11 +719,6 @@ static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_qdio *qdio, zfcp_qdio_req_init(adapter->qdio, &req->qdio_req, req->req_id, sbtype, req->qtcb, sizeof(struct fsf_qtcb)); - if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP)) { - zfcp_fsf_req_free(req); - return ERR_PTR(-EIO); - } - return req; } 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); |