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From 5df92ca22532ab926b65641f678def3dec823267 Mon Sep 17 00:00:00 2001
From: Tom St Denis <tom.stdenis@amd.com>
Date: Tue, 20 Mar 2018 09:13:08 -0400
Subject: [PATCH 3824/4131] drm/amd/amdgpu: fix offset into page with
amdgpu_iomem debugfs file
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The offset inside the page wasn't included in the copy call meaning
the start of the page was being read/written instead.
Reported-by: Jay Cornwall <Jay.Cornwall@amd.com>
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 2c4eed2..e6946fe 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -2232,7 +2232,7 @@ static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
return -EPERM;
ptr = kmap(p);
- r = copy_to_user(buf, ptr, bytes);
+ r = copy_to_user(buf, ptr + off, bytes);
kunmap(p);
if (r)
return -EFAULT;
@@ -2276,7 +2276,7 @@ static ssize_t amdgpu_iomem_write(struct file *f, const char __user *buf,
return -EPERM;
ptr = kmap(p);
- r = copy_from_user(ptr, buf, bytes);
+ r = copy_from_user(ptr + off, buf, bytes);
kunmap(p);
if (r)
return -EFAULT;
--
2.7.4
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