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drm/ttm: Fix 'buf' pointer update in ttm_bo_vm_access_kmap() (v2)

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The buf pointer was not being incremented inside the loop
meaning the same block of data would be read or written
repeatedly.

(v2) Change 'buf' pointer to uint8_t* type

Cc: stable@vger.kernel.org
Fixes: 09ac4fcb3f ("drm/ttm: Implement vm_operations_struct.access v2")

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tom St Denis 2018-01-26 09:32:29 -05:00 committed by Alex Deucher
parent a86170290c
commit 95244db2d3
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/ttm/ttm_bo_vm.c
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@ -316,7 +316,7 @@ static void ttm_bo_vm_close(struct vm_area_struct *vma)
static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
unsigned long offset,
void *buf, int len, int write)
uint8_t *buf, int len, int write)
{
unsigned long page = offset >> PAGE_SHIFT;
unsigned long bytes_left = len;
@ -345,6 +345,7 @@ static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
ttm_bo_kunmap(&map);
page++;
buf += bytes;
bytes_left -= bytes;
offset = 0;
} while (bytes_left);