Kernel Patch to fix amdgpu

[Sam Bingner]

Please apply the attached patch from https://github.com/torvalds/linux/commit/0cdb3f9740844b9d95ca413e3fcff11f81223ecf to the 6.8.0 kernel.  This is causing a panic when it tries to remove the module on some qualcomm servers.  I have verified that this applies cleanly, and that it corrects the problem.  As you can see this is a very safe patch.

r/
Sam Bingner


>From 0cdb3f9740844b9d95ca413e3fcff11f81223ecf Mon Sep 17 00:00:00 2001
From: Friedrich Vock <friedrich.vock at gmx.de>
Date: Tue, 14 May 2024 09:06:38 +0200
Subject: [PATCH] drm/amdgpu: Check if NBIO funcs are NULL in
 amdgpu_device_baco_exit
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The special case for VM passthrough doesn't check adev->nbio.funcs
before dereferencing it. If GPUs that don't have an NBIO block are
passed through, this leads to a NULL pointer dereference on startup.

Signed-off-by: Friedrich Vock <friedrich.vock at gmx.de>
Fixes: 1bece222eabe ("drm/amdgpu: Clear doorbell interrupt status for Sienna Cichlid")
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Christian König <christian.koenig at amd.com>
Acked-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 00fe3c2d54310f..e72e774d17e6a5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -6167,7 +6167,7 @@ int amdgpu_device_baco_exit(struct drm_device *dev)
 	    adev->nbio.funcs->enable_doorbell_interrupt)
 		adev->nbio.funcs->enable_doorbell_interrupt(adev, true);
 
-	if (amdgpu_passthrough(adev) &&
+	if (amdgpu_passthrough(adev) && adev->nbio.funcs &&
 	    adev->nbio.funcs->clear_doorbell_interrupt)
 		adev->nbio.funcs->clear_doorbell_interrupt(adev);