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IB/srp: Avoid duplicate connections 

The connection uniqueness check is performed before a new connection
is added to the target list. This patch protects both actions by a
mutex such that simultaneous writes from two different threads into the
"add_target" variable do not result in duplicate connections.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Bart Van Assche 2014-03-14 13:52:45 +01:00 committed by Roland Dreier
parent e7ffde0164
commit 2d7091bcf6
2 changed files with 10 additions and 3 deletions
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12
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -2614,6 +2614,8 @@ static ssize_t srp_create_target(struct device *dev,
target->tl_retry_count = 7;
target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
mutex_lock(&host->add_target_mutex);
ret = srp_parse_options(buf, target);
if (ret)
goto err;
@ -2682,7 +2684,11 @@ static ssize_t srp_create_target(struct device *dev,
be64_to_cpu(target->service_id),
target->path.sgid.raw, target->path.dgid.raw);
return count;
ret = count;
out:
mutex_unlock(&host->add_target_mutex);
return ret;
err_disconnect:
srp_disconnect_target(target);
@ -2698,8 +2704,7 @@ err_free_mem:
err:
scsi_host_put(target_host);
return ret;
goto out;
}
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
@ -2735,6 +2740,7 @@ static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
INIT_LIST_HEAD(&host->target_list);
spin_lock_init(&host->target_lock);
init_completion(&host->released);
mutex_init(&host->add_target_mutex);
host->srp_dev = device;
host->port = port;

1
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -105,6 +105,7 @@ struct srp_host {
spinlock_t target_lock;
struct completion released;
struct list_head list;
struct mutex add_target_mutex;
};
struct srp_request {