linux-kernel - [PATCH 4.19 043/110] drm/amdgpu: Fix oops when pp_funcs->switch_power

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Message-Id: <20181129135923.011397798@linuxfoundation.org>
Date:   Thu, 29 Nov 2018 15:12:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 4.19 043/110] drm/amdgpu: Fix oops when pp_funcs->switch_power_profile is unset

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Felix Kuehling <Felix.Kuehling@....com>

commit 919a52fc4ca137c871f295224507fa3401e08472 upstream.

On Vega20 and other pre-production GPUs, powerplay is not enabled yet.
Check for NULL pointers before calling pp_funcs function pointers.

Also affects Kaveri.

CC: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
Tested-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
@@ -496,8 +496,11 @@ void amdgpu_amdkfd_set_compute_idle(stru
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)kgd;
 
-	amdgpu_dpm_switch_power_profile(adev,
-					PP_SMC_POWER_PROFILE_COMPUTE, !idle);
+	if (adev->powerplay.pp_funcs &&
+	    adev->powerplay.pp_funcs->switch_power_profile)
+		amdgpu_dpm_switch_power_profile(adev,
+						PP_SMC_POWER_PROFILE_COMPUTE,
+						!idle);
 }
 
 bool amdgpu_amdkfd_is_kfd_vmid(struct amdgpu_device *adev, u32 vmid)