linux-kernel - [PATCH 3.2 32/74] IB/core: Add inline function to validate port

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Date:   Mon, 09 Oct 2017 13:30:34 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Yuval Shaia" <yuval.shaia@...cle.com>,
        "Leon Romanovsky" <leonro@...lanox.com>,
        "Doug Ledford" <dledford@...hat.com>
Subject: [PATCH 3.2 32/74] IB/core: Add inline function to validate port

3.2.94-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Yuval Shaia <yuval.shaia@...cle.com>

commit 24dc831b77eca9361cf835be59fa69ea0e471afc upstream.

Signed-off-by: Yuval Shaia <yuval.shaia@...cle.com>
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Doug Ledford <dledford@...hat.com>
[bwh: Backported to 3.2:
 - Drop inapplicable changes
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -67,7 +67,7 @@ int ib_get_cached_gid(struct ib_device *
 	unsigned long flags;
 	int ret = 0;
 
-	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
+	if (!rdma_is_port_valid(device, port_num))
 		return -EINVAL;
 
 	read_lock_irqsave(&device->cache.lock, flags);
@@ -129,7 +129,7 @@ int ib_get_cached_pkey(struct ib_device
 	unsigned long flags;
 	int ret = 0;
 
-	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
+	if (!rdma_is_port_valid(device, port_num))
 		return -EINVAL;
 
 	read_lock_irqsave(&device->cache.lock, flags);
@@ -157,7 +157,7 @@ int ib_find_cached_pkey(struct ib_device
 	int i;
 	int ret = -ENOENT;
 
-	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
+	if (!rdma_is_port_valid(device, port_num))
 		return -EINVAL;
 
 	read_lock_irqsave(&device->cache.lock, flags);
@@ -186,7 +186,7 @@ int ib_get_cached_lmc(struct ib_device *
 	unsigned long flags;
 	int ret = 0;
 
-	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
+	if (!rdma_is_port_valid(device, port_num))
 		return -EINVAL;
 
 	read_lock_irqsave(&device->cache.lock, flags);
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -563,7 +563,7 @@ int ib_query_port(struct ib_device *devi
 		  u8 port_num,
 		  struct ib_port_attr *port_attr)
 {
-	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
+	if (!rdma_is_port_valid(device, port_num))
 		return -EINVAL;
 
 	return device->query_port(device, port_num, port_attr);
@@ -641,7 +641,7 @@ int ib_modify_port(struct ib_device *dev
 	if (!device->modify_port)
 		return -ENOSYS;
 
-	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
+	if (!rdma_is_port_valid(device, port_num))
 		return -EINVAL;
 
 	return device->modify_port(device, port_num, port_modify_mask,
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1335,6 +1335,13 @@ static inline u8 rdma_end_port(const str
 		0 : device->phys_port_cnt;
 }
 
+static inline int rdma_is_port_valid(const struct ib_device *device,
+				     unsigned int port)
+{
+	return (port >= rdma_start_port(device) &&
+		port <= rdma_end_port(device));
+}
+
 int ib_query_gid(struct ib_device *device,
 		 u8 port_num, int index, union ib_gid *gid);