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| author | Christof Schmitt <christof.schmitt@de.ibm.com> | 2009-07-13 17:06:03 +0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-07-30 17:49:54 +0400 |
| commit | acf7b86150701de105aa8307b4b3f9dc533c45bb (patch) | |
| tree | 3478d074c3a013d6c256d9c3098b6451a8a38264 /drivers/s390/scsi/zfcp_sysfs.c | |
| parent | dfb3cf00e402686f671db697adbd8b9f4c219268 (diff) | |
| download | linux-acf7b86150701de105aa8307b4b3f9dc533c45bb.tar.xz | |
[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>
Diffstat (limited to 'drivers/s390/scsi/zfcp_sysfs.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_sysfs.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c index 3e51e64d1108..0fe5cce818cb 100644 --- a/drivers/s390/scsi/zfcp_sysfs.c +++ b/drivers/s390/scsi/zfcp_sysfs.c @@ -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); |