linux-kernel - [PATCH v3] drm/amdkfd: fix a memory leak in device_queue_manager

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Message-Id: <20260108071822.297364-1-lihaoxiang@isrc.iscas.ac.cn>
Date: Thu,  8 Jan 2026 15:18:22 +0800
From: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
To: Felix.Kuehling@....com,
	alexander.deucher@....com,
	christian.koenig@....com,
	airlied@...il.com,
	simona@...ll.ch,
	ozeng@....com
Cc: amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH v3] drm/amdkfd: fix a memory leak in device_queue_manager_init()

If dqm->ops.initialize() fails, add deallocate_hiq_sdma_mqd()
to release the memory allocated by allocate_hiq_sdma_mqd().
Move deallocate_hiq_sdma_mqd() up to ensure proper function
visibility at the point of use.

Fixes: 11614c36bc8f ("drm/amdkfd: Allocate MQD trunk for HIQ and SDMA")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
---
Chnages in v3:
- recheck the patch format.
Changes in v2:
- Move deallocate_hiq_sdma_mqd() up. Thanks, Felix!
- Add a Fixes tag.
---
 .../drm/amd/amdkfd/kfd_device_queue_manager.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index d7a2e7178ea9..8af0929ca40a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -2919,6 +2919,14 @@ static int allocate_hiq_sdma_mqd(struct device_queue_manager *dqm)
 	return retval;
 }
 
+static void deallocate_hiq_sdma_mqd(struct kfd_node *dev,
+				    struct kfd_mem_obj *mqd)
+{
+	WARN(!mqd, "No hiq sdma mqd trunk to free");
+
+	amdgpu_amdkfd_free_gtt_mem(dev->adev, &mqd->gtt_mem);
+}
+
 struct device_queue_manager *device_queue_manager_init(struct kfd_node *dev)
 {
 	struct device_queue_manager *dqm;
@@ -3042,19 +3050,14 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_node *dev)
 		return dqm;
 	}
 
+	if (!dev->kfd->shared_resources.enable_mes)
+		deallocate_hiq_sdma_mqd(dev, &dqm->hiq_sdma_mqd);
+
 out_free:
 	kfree(dqm);
 	return NULL;
 }
 
-static void deallocate_hiq_sdma_mqd(struct kfd_node *dev,
-				    struct kfd_mem_obj *mqd)
-{
-	WARN(!mqd, "No hiq sdma mqd trunk to free");
-
-	amdgpu_amdkfd_free_gtt_mem(dev->adev, &mqd->gtt_mem);
-}
-
 void device_queue_manager_uninit(struct device_queue_manager *dqm)
 {
 	dqm->ops.stop(dqm);
-- 
2.25.1