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[SCSI] zfcp: Acquire qdio_stat_lock when reading the queue utilization 

req_q_util is not atomic, so the qdio_stat_lock must be held when
reading this variable.

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@HansenPartnership.com>
This commit is contained in:
Christof Schmitt 2009-07-13 15:06:03 +02:00 committed by James Bottomley
parent dfb3cf00e4
commit acf7b86150
1 changed files with 6 additions and 1 deletions
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7
drivers/s390/scsi/zfcp_sysfs.c
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@ -494,9 +494,14 @@ static ssize_t zfcp_sysfs_adapter_q_full_show(struct device *dev,
struct Scsi_Host *scsi_host = class_to_shost(dev);
struct zfcp_adapter *adapter =
(struct zfcp_adapter *) scsi_host->hostdata[0];
u64 util;
spin_lock_bh(&adapter->qdio_stat_lock);
util = adapter->req_q_util;
spin_unlock_bh(&adapter->qdio_stat_lock);
return sprintf(buf, "%d %llu\n", atomic_read(&adapter->qdio_outb_full),
(unsigned long long)adapter->req_q_util);
(unsigned long long)util);
}
static DEVICE_ATTR(queue_full, S_IRUGO, zfcp_sysfs_adapter_q_full_show, NULL);