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[SCSI] zfcp: Remove adapter list

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After the latest changes, the list of FCP devices is only used to
lookup the adapter for requests from the actcli tool. Change this to
use the lookup function in the cio layer. Now we can remove the
adapter list and have one place less to use the global config_lock.

Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Acked-by: Felix Beck <felix@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Christof Schmitt 2008-12-19 16:56:55 +01:00 committed by James Bottomley
parent dedbc2b3cb
commit b228af0269
3 changed files with 3 additions and 28 deletions
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12
drivers/s390/scsi/zfcp_aux.c
View file

@ -181,7 +181,6 @@ static int __init zfcp_module_init(void)
zfcp_data.work_queue = create_singlethread_workqueue("zfcp_wq");
INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
sema_init(&zfcp_data.config_sema, 1);
rwlock_init(&zfcp_data.config_lock);
@ -527,11 +526,7 @@ int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
&zfcp_sysfs_adapter_attrs))
goto sysfs_failed;
write_lock_irq(&zfcp_data.config_lock);
atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
write_unlock_irq(&zfcp_data.config_lock);
zfcp_fc_nameserver_init(adapter);
if (!zfcp_adapter_scsi_register(adapter))
@ -574,14 +569,7 @@ void zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
return;
zfcp_adapter_debug_unregister(adapter);
/* remove specified adapter data structure from list */
write_lock_irq(&zfcp_data.config_lock);
list_del(&adapter->list);
write_unlock_irq(&zfcp_data.config_lock);
zfcp_qdio_free(adapter);
zfcp_free_low_mem_buffers(adapter);
kfree(adapter->req_list);
kfree(adapter->fc_stats);

17
drivers/s390/scsi/zfcp_cfdc.c
View file

@ -85,20 +85,9 @@ static int zfcp_cfdc_copy_to_user(void __user *user_buffer,
static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
{
struct zfcp_adapter *adapter = NULL, *cur_adapter;
struct ccw_dev_id dev_id;
read_lock_irq(&zfcp_data.config_lock);
list_for_each_entry(cur_adapter, &zfcp_data.adapter_list_head, list) {
ccw_device_get_id(cur_adapter->ccw_device, &dev_id);
if (dev_id.devno == devno) {
adapter = cur_adapter;
zfcp_adapter_get(adapter);
break;
}
}
read_unlock_irq(&zfcp_data.config_lock);
return adapter;
char busid[9];
snprintf(busid, sizeof(busid), "0.0.%04x", devno);
return zfcp_get_adapter_by_busid(busid);
}
static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)

2
drivers/s390/scsi/zfcp_def.h
View file

@ -451,7 +451,6 @@ struct zfcp_latencies {
};
struct zfcp_adapter {
struct list_head list; /* list of adapters */
atomic_t refcount; /* reference count */
wait_queue_head_t remove_wq; /* can be used to wait for
refcount drop to zero */
@ -593,7 +592,6 @@ struct zfcp_fsf_req {
struct zfcp_data {
struct scsi_host_template scsi_host_template;
struct scsi_transport_template *scsi_transport_template;
struct list_head adapter_list_head; /* head of adapter list */
rwlock_t config_lock; /* serialises changes
to adapter/port/unit
lists */