IB: Remove useless ibdev_is_alive() tests from sysfs code

Some attribute show functions test ibdev_is_alive() to make sure that
it's OK to access device state.  However, the sysfs attributes will
not be registered until the device is fully initialized, and they'll
be unregistered before anything is torn down, so ibdev_is_alive()
doesn't do anything useful.  Remove it.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/sysfs.c

@@ -66,11 +66,6 @@ struct port_table_attribute {
 	int			index;
 };
 
-static inline int ibdev_is_alive(const struct ib_device *dev)
-{
-	return dev->reg_state == IB_DEV_REGISTERED;
-}
-
 static ssize_t port_attr_show(struct kobject *kobj,
 			      struct attribute *attr, char *buf)
 {
@@ -80,8 +75,6 @@ static ssize_t port_attr_show(struct kobject *kobj,
 
 	if (!port_attr->show)
 		return -EIO;
-	if (!ibdev_is_alive(p->ibdev))
-		return -ENODEV;
 
 	return port_attr->show(p, port_attr, buf);
 }
@@ -562,9 +555,6 @@ static ssize_t show_node_type(struct device *device,
 {
 	struct ib_device *dev = container_of(device, struct ib_device, dev);
 
-	if (!ibdev_is_alive(dev))
-		return -ENODEV;
-
 	switch (dev->node_type) {
 	case RDMA_NODE_IB_CA:	  return sprintf(buf, "%d: CA\n", dev->node_type);
 	case RDMA_NODE_RNIC:	  return sprintf(buf, "%d: RNIC\n", dev->node_type);
@@ -581,9 +571,6 @@ static ssize_t show_sys_image_guid(struct device *device,
 	struct ib_device_attr attr;
 	ssize_t ret;
 
-	if (!ibdev_is_alive(dev))
-		return -ENODEV;
-
 	ret = ib_query_device(dev, &attr);
 	if (ret)
 		return ret;
@@ -600,9 +587,6 @@ static ssize_t show_node_guid(struct device *device,
 {
 	struct ib_device *dev = container_of(device, struct ib_device, dev);
 
-	if (!ibdev_is_alive(dev))
-		return -ENODEV;
-
 	return sprintf(buf, "%04x:%04x:%04x:%04x\n",
 		       be16_to_cpu(((__be16 *) &dev->node_guid)[0]),
 		       be16_to_cpu(((__be16 *) &dev->node_guid)[1]),