[PATCH 3/6] drm/amdgpu: Wait for all user clients

[Andrey Grodzovsky <andrey.grodzovsky@amd.com>]

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        | 2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    | 2 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c    | 4 ++++
 4 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index bc1e0fd..79274d5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -990,6 +990,8 @@ struct amdgpu_device {
 	char				product_number[16];
 	char				product_name[32];
 	char				serial[16];
+
+	wait_queue_head_t		user_clients_done;
 };
 
 static inline struct amdgpu_device *amdgpu_ttm_adev(struct ttm_bo_device *bdev)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 4da52b7..3bd67cf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3271,6 +3271,9 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	if (r)
 		dev_err(adev->dev, "amdgpu_pmu_init failed\n");
 
+
+	init_waitqueue_head(&adev->user_clients_done);
+
 	return 0;
 
 failed:
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index ea2b47e..0531727 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1141,10 +1141,12 @@ static void
 amdgpu_pci_remove(struct pci_dev *pdev)
 {
 	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct amdgpu_device *adev = dev->dev_private;
 
 	drm_dev_unplug(dev);
 
 	amdgpu_force_unmap_user_space_mappings(dev);
+	wait_event(adev->user_clients_done, (dev->open_count == 0));
 
 	amdgpu_driver_unload_kms(dev);
 	pci_disable_device(pdev);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 61fb2ef..d8fc775 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -957,8 +957,12 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
  */
 void amdgpu_driver_lastclose_kms(struct drm_device *dev)
 {
+	struct amdgpu_device *adev = dev->dev_private;
+
 	drm_fb_helper_lastclose(dev);
 	vga_switcheroo_process_delayed_switch();
+
+	wake_up(&adev->user_clients_done);
 }
 
 /**
-- 
2.7.4

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