linux-kernel - [PATCH 5.0 07/52] drm/amdgpu: fix invalid use of change

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Message-Id: <20190326042701.327682053@linuxfoundation.org>
Date:   Tue, 26 Mar 2019 15:29:54 +0900
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.0 07/52] drm/amdgpu: fix invalid use of change_bit

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

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

From: Christian König <christian.koenig@....com>

commit 72464382fc2d3673eb51f21a57f2c0a320c1552f upstream.

We only need to clear the bit in a 32bit integer.

This fixes a crah on ARM64 and PPC64LE caused by
"drm/amdgpu: update the vm invalidation engine layout V2"

Signed-off-by: Christian König <christian.koenig@....com>
Acked-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -738,7 +738,7 @@ static int gmc_v9_0_allocate_vm_inv_eng(
 		}
 
 		ring->vm_inv_eng = inv_eng - 1;
-		change_bit(inv_eng - 1, (unsigned long *)(&vm_inv_engs[vmhub]));
+		vm_inv_engs[vmhub] &= ~(1 << ring->vm_inv_eng);
 
 		dev_info(adev->dev, "ring %s uses VM inv eng %u on hub %u\n",
 			 ring->name, ring->vm_inv_eng, ring->funcs->vmhub);