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| author | Ben Skeggs <bskeggs@redhat.com> | 2013-09-17 14:21:15 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2013-09-19 11:48:30 +1000 |
| commit | 182b17c8dc4e83aab000ce86587b6810e515da87 (patch) | |
| tree | 64962eec5002e424d812cd9564e549daf801c03a /drivers | |
| parent | 4f7d1bc973ec71dfeeb951765cafe1ff3a63243e (diff) | |
| download | linux-182b17c8dc4e83aab000ce86587b6810e515da87.tar.gz linux-182b17c8dc4e83aab000ce86587b6810e515da87.tar.bz2 linux-182b17c8dc4e83aab000ce86587b6810e515da87.zip | |
drm/ttm: fix the tt_populated check in ttm_tt_destroy()
After a vmalloc failure in ttm_dma_tt_alloc_page_directory(),
ttm_dma_tt_init() will call ttm_tt_destroy() to cleanup, and end up
inside the driver's unpopulate() hook when populate() has never yet
been called.
On nouveau, the first issue to be hit because of this is that
dma_address[] may be a NULL pointer. After working around this,
ttm_pool_unpopulate() may potentially hit the same issue with
the pages[] array.
It seems to make more sense to avoid calling unpopulate on already
unpopulated TTMs than to add checks to all the implementations.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Cc: stable@vger.kernel.org
Cc: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_tt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 5e93a52d4f2c..210d50365162 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -170,7 +170,7 @@ void ttm_tt_destroy(struct ttm_tt *ttm) ttm_tt_unbind(ttm); } - if (likely(ttm->pages != NULL)) { + if (ttm->state == tt_unbound) { ttm->bdev->driver->ttm_tt_unpopulate(ttm); } |