IB/core: Removed port validity check from ib_get_cached_subnet_prefix

Removed port validity check from ib_get_cached_subnet_prefix() as this
check is not needed because "port_num" is valid.

Link: https://lore.kernel.org/r/20210616154509.1047-2-anand.a.khoje@oracle.comSuggested-by: NLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: NAnand Khoje <anand.a.khoje@oracle.com>
Signed-off-by: NHaakon Bugge <haakon.bugge@oracle.com>
Reviewed-by: NLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/core/cache.c

@@ -1069,19 +1069,14 @@ int ib_get_cached_pkey(struct ib_device *device,
 }
 EXPORT_SYMBOL(ib_get_cached_pkey);
 
-int ib_get_cached_subnet_prefix(struct ib_device *device, u32 port_num,
+void ib_get_cached_subnet_prefix(struct ib_device *device, u32 port_num,
 				u64 *sn_pfx)
 {
 	unsigned long flags;
 
-	if (!rdma_is_port_valid(device, port_num))
-		return -EINVAL;
-
 	read_lock_irqsave(&device->cache_lock, flags);
 	*sn_pfx = device->port_data[port_num].cache.subnet_prefix;
 	read_unlock_irqrestore(&device->cache_lock, flags);
-
-	return 0;
 }
 EXPORT_SYMBOL(ib_get_cached_subnet_prefix);
 

drivers/infiniband/core/core_priv.h

@@ -212,7 +212,7 @@ int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
 			     struct nlmsghdr *nlh,
 			     struct netlink_ext_ack *extack);
 
-int ib_get_cached_subnet_prefix(struct ib_device *device,
+void ib_get_cached_subnet_prefix(struct ib_device *device,
 				u32 port_num,
 				u64 *sn_pfx);
 

drivers/infiniband/core/device.c

@@ -887,15 +887,8 @@ static void ib_policy_change_task(struct work_struct *work)
 
 		rdma_for_each_port (dev, i) {
 			u64 sp;
-			int ret = ib_get_cached_subnet_prefix(dev,
-							      i,
-							      &sp);
-
-			WARN_ONCE(ret,
-				  "ib_get_cached_subnet_prefix err: %d, this should never happen here\n",
-				  ret);
-			if (!ret)
-				ib_security_cache_change(dev, i, sp);
+			ib_get_cached_subnet_prefix(dev, i, &sp);
+			ib_security_cache_change(dev, i, sp);
 		}
 	}
 	up_read(&devices_rwsem);

drivers/infiniband/core/security.c

@@ -72,7 +72,7 @@ static int get_pkey_and_subnet_prefix(struct ib_port_pkey *pp,
 	if (ret)
 		return ret;
 
-	ret = ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);
+	ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);
 
 	return ret;
 }
@@ -664,10 +664,7 @@ static int ib_security_pkey_access(struct ib_device *dev,
 	if (ret)
 		return ret;
 
-	ret = ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);
-
-	if (ret)
-		return ret;
+	ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);
 
 	return security_ib_pkey_access(sec, subnet_prefix, pkey);
 }