From: "Xiangliang.Yu" <Xiangliang.Yu@amd.com>
Date: Thu, 21 Sep 2017 10:19:49 +0800
Subject: drm/amdgpu: Fix driver reloading failure
Git-commit: fd4495e57cd2594098493a0e5b6beccae8cbf47b
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

SRIOV doesn't implement PMC capability of PCIe, so it can't update
power state by reading PMC register.

Currently, amdgpu driver doesn't disable pci device when removing
driver, the enable_cnt of pci device will not be decrease to 0.
When reloading driver, pci_enable_device will do nothing as
enable_cnt is not zero. And power state will not be updated as PMC
is not support.
So current_state of pci device is not D0 state and pci_enable_msi
return fail.

Add pci_disable_device when remmoving driver to fix the issue.

Signed-off-by: Xiangliang.Yu <Xiangliang.Yu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -609,6 +609,8 @@ amdgpu_pci_remove(struct pci_dev *pdev)
 
 	drm_dev_unregister(dev);
 	drm_dev_unref(dev);
+	pci_disable_device(pdev);
+	pci_set_drvdata(pdev, NULL);
 }
 
 static void