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IB/srp: Change target_mutex to a spinlock 

The SRP driver never sleeps while holding target_mutex, and it's just
used to protect some simple list operations, so hold times will be
short.  So just convert it to a spinlock, which is smaller and faster.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Matthew Wilcox 2006-06-17 20:37:30 -07:00 committed by Roland Dreier
parent 549c5fc2c8
commit b3589fd490
2 changed files with 8 additions and 8 deletions
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14
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -361,9 +361,9 @@ static void srp_remove_work(void *target_ptr)
target->state = SRP_TARGET_REMOVED;
spin_unlock_irq(target->scsi_host->host_lock);
mutex_lock(&target->srp_host->target_mutex);
spin_lock(&target->srp_host->target_lock);
list_del(&target->list);
mutex_unlock(&target->srp_host->target_mutex);
spin_unlock(&target->srp_host->target_lock);
scsi_remove_host(target->scsi_host);
ib_destroy_cm_id(target->cm_id);
@ -1450,9 +1450,9 @@ static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
return -ENODEV;
mutex_lock(&host->target_mutex);
spin_lock(&host->target_lock);
list_add_tail(&target->list, &host->target_list);
mutex_unlock(&host->target_mutex);
spin_unlock(&host->target_lock);
target->state = SRP_TARGET_LIVE;
@ -1724,7 +1724,7 @@ static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
return NULL;
INIT_LIST_HEAD(&host->target_list);
mutex_init(&host->target_mutex);
spin_lock_init(&host->target_lock);
init_completion(&host->released);
host->dev = device;
host->port = port;
@ -1866,14 +1866,14 @@ static void srp_remove_one(struct ib_device *device)
* Mark all target ports as removed, so we stop queueing
* commands and don't try to reconnect.
*/
mutex_lock(&host->target_mutex);
spin_lock(&host->target_lock);
list_for_each_entry(target, &host->target_list, list) {
spin_lock_irqsave(target->scsi_host->host_lock, flags);
if (target->state != SRP_TARGET_REMOVED)
target->state = SRP_TARGET_REMOVED;
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
}
mutex_unlock(&host->target_mutex);
spin_unlock(&host->target_lock);
/*
* Wait for any reconnection tasks that may have

2
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -99,7 +99,7 @@ struct srp_host {
u8 port;
struct class_device class_dev;
struct list_head target_list;
struct mutex target_mutex;
spinlock_t target_lock;
struct completion released;
struct list_head list;
};