[PATCH] drm/amdgpu: fix frame size of amdgpu_xgmi_add_devices excceed 1024 bytes

[Yuan, Xiaojie]

Would be better to add a is-null check for 'tmp_topology' after kzalloc(). With that fixed, patch is

Reviewed-by: Xiaojie Yuan <xiaojie.yuan at amd.com>


Regards,

Xiaojie

________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Hawking Zhang <Hawking.Zhang at amd.com>
Sent: Wednesday, November 7, 2018 11:29 AM
To: amd-gfx at lists.freedesktop.org
Cc: Zhang, Hawking
Subject: [PATCH] drm/amdgpu: fix frame size of amdgpu_xgmi_add_devices excceed 1024 bytes

Instead of stack-allocated psp_xgmi_topology_info in function
amdgpu_xgmi_add_device, dynamically allocated this structure to
avoid the frame size of this function excceed 1024 bytes.

Signed-off-by: Hawking Zhang <Hawking.Zhang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
index e92b454..1c0ed13 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
@@ -63,7 +63,7 @@ static struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)

 int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
 {
-       struct psp_xgmi_topology_info tmp_topology;
+       struct psp_xgmi_topology_info *tmp_topology;
         struct amdgpu_hive_info *hive;
         struct amdgpu_xgmi      *entry;
         struct amdgpu_device     *tmp_adev;
@@ -76,7 +76,7 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
         adev->gmc.xgmi.node_id = psp_xgmi_get_node_id(&adev->psp);
         adev->gmc.xgmi.hive_id = psp_xgmi_get_hive_id(&adev->psp);

-       memset(&tmp_topology, 0, sizeof(tmp_topology));
+       tmp_topology = kzalloc(sizeof(struct psp_xgmi_topology_info), GFP_KERNEL);
         mutex_lock(&xgmi_mutex);
         hive = amdgpu_get_xgmi_hive(adev);
         if (!hive)
@@ -84,9 +84,9 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)

         list_add_tail(&adev->gmc.xgmi.head, &hive->device_list);
         list_for_each_entry(entry, &hive->device_list, head)
-               tmp_topology.nodes[count++].node_id = entry->node_id;
+               tmp_topology->nodes[count++].node_id = entry->node_id;

-       ret = psp_xgmi_get_topology_info(&adev->psp, count, &tmp_topology);
+       ret = psp_xgmi_get_topology_info(&adev->psp, count, tmp_topology);
         if (ret) {
                 dev_err(adev->dev,
                         "XGMI: Get topology failure on device %llx, hive %llx, ret %d",
@@ -96,7 +96,7 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
         }
         /* Each psp need to set the latest topology */
         list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head) {
-               ret = psp_xgmi_set_topology_info(&tmp_adev->psp, count, &tmp_topology);
+               ret = psp_xgmi_set_topology_info(&tmp_adev->psp, count, tmp_topology);
                 if (ret) {
                         dev_err(tmp_adev->dev,
                                 "XGMI: Set topology failure on device %llx, hive %llx, ret %d",
@@ -113,5 +113,6 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)

 exit:
         mutex_unlock(&xgmi_mutex);
+       kfree(tmp_topology);
         return ret;
 }
--
2.7.4

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