[PATCH] drm/amdkfd: Fix warnings from static analyzer Smatch

[Ramesh Errabolu]

The patch fixes warnings/error as reported by Smatch a static analyzer

drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_topology.c:1428 kfd_create_indirect_link_prop() warn: iterator used outside loop: 'cpu_link'
drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_topology.c:1462 kfd_create_indirect_link_prop() error: we previously assumed 'cpu_dev' could be null (see line 1420)
drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_topology.c:1516 kfd_add_peer_prop() warn: iterator used outside loop: 'iolink3'

Fixes: 40d6aa758b13 ("drm/amdkfd: Extend KFD device topology to surface peer-to-peer links")
Signed-off-by: Ramesh Errabolu <Ramesh.Errabolu at amd.com>
Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_topology.c | 34 +++++++++++------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
index 25990bec600d..ca4825e555b7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
@@ -1417,15 +1417,15 @@ static int kfd_create_indirect_link_prop(struct kfd_topology_device *kdev, int g
 
 		/* find CPU <-->  CPU links */
 		cpu_dev = kfd_topology_device_by_proximity_domain(i);
-		if (cpu_dev) {
-			list_for_each_entry(cpu_link,
-					&cpu_dev->io_link_props, list) {
-				if (cpu_link->node_to == gpu_link->node_to)
-					break;
-			}
-		}
+		if (!cpu_dev)
+			continue;
+
+		list_for_each_entry(cpu_link, &cpu_dev->io_link_props, list)
+			if (cpu_link->node_to == gpu_link->node_to)
+				break;
 
-		if (cpu_link->node_to != gpu_link->node_to)
+		/* Ensures we didn't exit from list search with no hits */
+		if (list_entry_is_head(cpu_link, &cpu_dev->io_link_props, list))
 			return -ENOMEM;
 
 		/* CPU <--> CPU <--> GPU, GPU node*/
@@ -1510,16 +1510,16 @@ static int kfd_add_peer_prop(struct kfd_topology_device *kdev,
 		cpu_dev = kfd_topology_device_by_proximity_domain(iolink1->node_to);
 		if (cpu_dev) {
 			list_for_each_entry(iolink3, &cpu_dev->io_link_props, list)
-				if (iolink3->node_to == iolink2->node_to)
+				if (iolink3->node_to == iolink2->node_to) {
+					props->weight += iolink3->weight;
+					props->min_latency += iolink3->min_latency;
+					props->max_latency += iolink3->max_latency;
+					props->min_bandwidth = min(props->min_bandwidth,
+									iolink3->min_bandwidth);
+					props->max_bandwidth = min(props->max_bandwidth,
+									iolink3->max_bandwidth);
 					break;
-
-			props->weight += iolink3->weight;
-			props->min_latency += iolink3->min_latency;
-			props->max_latency += iolink3->max_latency;
-			props->min_bandwidth = min(props->min_bandwidth,
-							iolink3->min_bandwidth);
-			props->max_bandwidth = min(props->max_bandwidth,
-							iolink3->max_bandwidth);
+				}
 		} else {
 			WARN(1, "CPU node not found");
 		}
-- 
2.35.1