diff options
| author | Swen Schillig <swen@vnet.ibm.com> | 2009-11-24 16:54:00 +0100 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2009-12-04 12:02:02 -0600 |
| commit | de3dc57214a1466034ecc4d4ffb10331d34c09a3 (patch) | |
| tree | 63eb490d66f9db2cf032041392fb2f4d5ac4785c /drivers/s390/scsi/zfcp_cfdc.c | |
| parent | f3450c7b917201bb49d67032e9f60d5125675d6a (diff) | |
[SCSI] zfcp: Remove global config_mutex
The global config_mutex was required for the serialization of a
configuration change within the zfcp driver. This global locking is
now obsolete and can be removed. The requirement of serializing the
access to a zfcp_adapter reference via a ccw_device is realized wth a
static spinlock.
Signed-off-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>
Diffstat (limited to 'drivers/s390/scsi/zfcp_cfdc.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_cfdc.c | 25 |
1 files changed, 10 insertions, 15 deletions
diff --git a/drivers/s390/scsi/zfcp_cfdc.c b/drivers/s390/scsi/zfcp_cfdc.c index 856f82dbcb1..f932400e980 100644 --- a/drivers/s390/scsi/zfcp_cfdc.c +++ b/drivers/s390/scsi/zfcp_cfdc.c @@ -86,22 +86,17 @@ static int zfcp_cfdc_copy_to_user(void __user *user_buffer, static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno) { char busid[9]; - struct ccw_device *ccwdev; - struct zfcp_adapter *adapter = NULL; + struct ccw_device *cdev; + struct zfcp_adapter *adapter; snprintf(busid, sizeof(busid), "0.0.%04x", devno); - ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); - if (!ccwdev) - goto out; - - adapter = dev_get_drvdata(&ccwdev->dev); - if (!adapter) - goto out_put; - - kref_get(&adapter->ref); -out_put: - put_device(&ccwdev->dev); -out: + cdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid); + if (!cdev) + return NULL; + + adapter = zfcp_ccw_adapter_by_cdev(cdev); + + put_device(&cdev->dev); return adapter; } @@ -244,7 +239,7 @@ static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command, free_sg: zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES); adapter_put: - kref_put(&adapter->ref, zfcp_adapter_release); + zfcp_ccw_adapter_put(adapter); free_buffer: kfree(data); no_mem_sense: |