drm/amdgpu: Fix memory leak in hpd_rx_irq_create_workqueue()

[ Upstream commit 7136f956c73c4ba50bfeb61653dfd6a9669ea915 ]

If construction of the array of work queues to handle hpd_rx_irq offload
work fails, we need to unwind. Destroy all the created workqueues and
the allocated memory for the hpd_rx_irq_offload_work_queue struct array.

Fixes: 8e794421bc98 ("drm/amd/display: Fork thread to offload work of hpd_rx_irq")
Signed-off-by: Rafael Mendonca <rafaelmendsr@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 6e36427aab46273d8605d6f5df0e296998a77e55..194142c581c8f09b8df3f5d8d11d7094ab095d0a 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1296,13 +1296,21 @@ static struct hpd_rx_irq_offload_work_queue *hpd_rx_irq_create_workqueue(struct
 
                if (hpd_rx_offload_wq[i].wq == NULL) {
                        DRM_ERROR("create amdgpu_dm_hpd_rx_offload_wq fail!");
-                       return NULL;
+                       goto out_err;
                }
 
                spin_lock_init(&hpd_rx_offload_wq[i].offload_lock);
        }
 
        return hpd_rx_offload_wq;
+
+out_err:
+       for (i = 0; i < max_caps; i++) {
+               if (hpd_rx_offload_wq[i].wq)
+                       destroy_workqueue(hpd_rx_offload_wq[i].wq);
+       }
+       kfree(hpd_rx_offload_wq);
+       return NULL;
 }
 
 struct amdgpu_stutter_quirk {