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| author | Martin Petermann <martin.petermann@de.ibm.com> | 2009-04-17 15:08:12 +0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-04-27 10:07:34 -0500 |
| commit | 7001f0c4863230dd1560425fa0f5aad9e21716b8 (patch) | |
| tree | 33bebe1d590076cf78a19dc813f9b271bf8d72bc /drivers | |
| parent | c6936e7f34383db2f5038dfa2f0c168ebc2920e5 (diff) | |
| download | blackbird-op-linux-7001f0c4863230dd1560425fa0f5aad9e21716b8.tar.gz blackbird-op-linux-7001f0c4863230dd1560425fa0f5aad9e21716b8.zip | |
[SCSI] zfcp: revert previous patch for sbal counting
The current sbal counting can be wrong if a fsf request is
waiting for free sbals and at the same time qdio request queue
is shutdown and re-opened. Revering a previous patch fixes this
issue.
Signed-off-by: Martin Petermann <martin.petermann@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/scsi/zfcp_fsf.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c index bd2b23766894..3f365ace7711 100644 --- a/drivers/s390/scsi/zfcp_fsf.c +++ b/drivers/s390/scsi/zfcp_fsf.c @@ -645,30 +645,30 @@ static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req) } } -static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter) - __releases(&adapter->req_q_lock) - __acquires(&adapter->req_q_lock) +static int zfcp_fsf_sbal_check(struct zfcp_adapter *adapter) { struct zfcp_qdio_queue *req_q = &adapter->req_q; - long ret; - if (atomic_read(&req_q->count) <= -REQUEST_LIST_SIZE) - return -EIO; - if (atomic_read(&req_q->count) > 0) - return 0; + spin_lock_bh(&adapter->req_q_lock); + if (atomic_read(&req_q->count)) + return 1; + spin_unlock_bh(&adapter->req_q_lock); + return 0; +} + +static int zfcp_fsf_req_sbal_get(struct zfcp_adapter *adapter) +{ + long ret; - atomic_dec(&req_q->count); spin_unlock_bh(&adapter->req_q_lock); ret = wait_event_interruptible_timeout(adapter->request_wq, - atomic_read(&req_q->count) >= 0, - 5 * HZ); - spin_lock_bh(&adapter->req_q_lock); - atomic_inc(&req_q->count); - + zfcp_fsf_sbal_check(adapter), 5 * HZ); if (ret > 0) return 0; if (!ret) atomic_inc(&adapter->qdio_outb_full); + + spin_lock_bh(&adapter->req_q_lock); return -EIO; } |
