This is a note to let you know that I've just added the patch titled
drm/ttm: Fix 'buf' pointer update in ttm_bo_vm_access_kmap() (v2)
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-ttm-fix-buf-pointer-update-in-ttm_bo_vm_access_kmap-v2.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 95244db2d3f743f37e69446a2807dd1a42750542 Mon Sep 17 00:00:00 2001
From: Tom St Denis <tom.stdenis@xxxxxxx>
Date: Fri, 26 Jan 2018 09:32:29 -0500
Subject: drm/ttm: Fix 'buf' pointer update in ttm_bo_vm_access_kmap() (v2)
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From: Tom St Denis <tom.stdenis@xxxxxxx>
commit 95244db2d3f743f37e69446a2807dd1a42750542 upstream.
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@xxxxxxxxxxxxxxx
Fixes: 09ac4fcb3f25 ("drm/ttm: Implement vm_operations_struct.access v2")
Signed-off-by: Tom St Denis <tom.stdenis@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo_vm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -299,7 +299,7 @@ static void ttm_bo_vm_close(struct vm_ar
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;
@@ -328,6 +328,7 @@ static int ttm_bo_vm_access_kmap(struct
ttm_bo_kunmap(&map);
page++;
+ buf += bytes;
bytes_left -= bytes;
offset = 0;
} while (bytes_left);
Patches currently in stable-queue which might be from tom.stdenis@xxxxxxx are
queue-4.15/drm-ttm-fix-buf-pointer-update-in-ttm_bo_vm_access_kmap-v2.patch