[PATCH] drm/amdgpu: fix warning in ras_debugfs_create_all()

[Zhang, Hawking]

[AMD Official Use Only - Internal Distribution Only]

Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>

Regards,
Hawking
-----Original Message-----
From: Stanley.Yang <Stanley.Yang at amd.com> 
Sent: Thursday, March 12, 2020 18:43
To: amd-gfx at lists.freedesktop.org
Cc: Zhang, Hawking <Hawking.Zhang at amd.com>; Chen, Guchun <Guchun.Chen at amd.com>; Li, Dennis <Dennis.Li at amd.com>; Clements, John <John.Clements at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>; Yang, Stanley <Stanley.Yang at amd.com>
Subject: [PATCH] drm/amdgpu: fix warning in ras_debugfs_create_all()

Fix the warning
"warn: variable dereferenced before check 'obj' (see line 1131)"
by removing unnecessary checks as amdgpu_ras_debugfs_create_all() is only called from amdgpu_debugfs_init() where obj member in
con->head list is not NULL.
Use list_for_each_entry() instead list_for_each_entry_safe() as obj do not to be freeing or removing from list during this process.

Signed-off-by: Stanley.Yang <Stanley.Yang at amd.com>
Change-Id: I33d68d5c0b9db2744732f4db924600afd99f956c
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index ce8548d5fbf3..ae2d569ac678 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -1116,7 +1116,7 @@ void amdgpu_ras_debugfs_create(struct amdgpu_device *adev,  void amdgpu_ras_debugfs_create_all(struct amdgpu_device *adev)  {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
-	struct ras_manager *obj, *tmp;
+	struct ras_manager *obj;
 	struct ras_fs_if fs_info;
 
 	/*
@@ -1128,10 +1128,7 @@ void amdgpu_ras_debugfs_create_all(struct amdgpu_device *adev)
 
 	amdgpu_ras_debugfs_create_ctrl_node(adev);
 
-	list_for_each_entry_safe(obj, tmp, &con->head, node) {
-		if (!obj)
-			continue;
-
+	list_for_each_entry(obj, &con->head, node) {
 		if (amdgpu_ras_is_supported(adev, obj->head.block) &&
 			(obj->attr_inuse == 1)) {
 			sprintf(fs_info.debugfs_name, "%s_err_inject",
--
2.17.1