IB/ipath: fix race with exposing reset file
We were accidentally exposing the "reset" sysfs file more than once
per device.
Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/ipath/ipath_sysfs.c b/drivers/infiniband/hw/ipath/ipath_sysfs.c
index 32acd80..f323791 100644
--- a/drivers/infiniband/hw/ipath/ipath_sysfs.c
+++ b/drivers/infiniband/hw/ipath/ipath_sysfs.c
@@ -711,10 +711,22 @@
* enters diag mode. A device reset is quite likely to crash the
* machine entirely, so we don't want to normally make it
* available.
+ *
+ * Called with ipath_mutex held.
*/
int ipath_expose_reset(struct device *dev)
{
- return device_create_file(dev, &dev_attr_reset);
+ static int exposed;
+ int ret;
+
+ if (!exposed) {
+ ret = device_create_file(dev, &dev_attr_reset);
+ exposed = 1;
+ }
+ else
+ ret = 0;
+
+ return ret;
}
int ipath_driver_create_group(struct device_driver *drv)