diff options
| author | Thomas Hellstrom <thellstrom@vmware.com> | 2013-10-30 03:29:50 -0700 |
|---|---|---|
| committer | Thomas Hellstrom <thellstrom@vmware.com> | 2013-11-06 04:36:12 -0800 |
| commit | da95c788ef0c645378ffccb7060a0df1a33aee38 (patch) | |
| tree | d09283dd7a99a2afa40398ebadcd29b8cdd505dd /drivers/gpu/drm/ttm | |
| parent | 9a0599ddeae012a771bba5e23393fc52d8a59d89 (diff) | |
drm/ttm: Fix ttm_bo_move_memcpy
All error paths will want to keep the mm node, so handle this at the
function exit. This fixes an ioremap failure error path.
Also add some comments to make the function a bit easier to understand.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/gpu/drm/ttm')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo_util.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c index 8369e35c0dce..4834c463c38b 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -343,21 +343,25 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo, if (ret) goto out; + /* + * Single TTM move. NOP. + */ if (old_iomap == NULL && new_iomap == NULL) goto out2; + + /* + * Move nonexistent data. NOP. + */ if (old_iomap == NULL && ttm == NULL) goto out2; - /* TTM might be null for moves within the same region. + /* + * TTM might be null for moves within the same region. */ if (ttm && ttm->state == tt_unpopulated) { ret = ttm->bdev->driver->ttm_tt_populate(ttm); - if (ret) { - /* if we fail here don't nuke the mm node - * as the bo still owns it */ - old_copy.mm_node = NULL; + if (ret) goto out1; - } } add = 0; @@ -383,11 +387,8 @@ int ttm_bo_move_memcpy(struct ttm_buffer_object *bo, prot); } else ret = ttm_copy_io_page(new_iomap, old_iomap, page); - if (ret) { - /* failing here, means keep old copy as-is */ - old_copy.mm_node = NULL; + if (ret) goto out1; - } } mb(); out2: @@ -405,7 +406,12 @@ out1: ttm_mem_reg_iounmap(bdev, old_mem, new_iomap); out: ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap); - ttm_bo_mem_put(bo, &old_copy); + + /* + * On error, keep the mm node! + */ + if (!ret) + ttm_bo_mem_put(bo, &old_copy); return ret; } EXPORT_SYMBOL(ttm_bo_move_memcpy); |