diff options
| author | Takashi Iwai <tiwai@suse.de> | 2018-04-10 19:05:13 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-04-10 22:30:43 +0200 |
| commit | 9e7f06c8beee304ee21b791653fefcd713f48b9a (patch) | |
| tree | aaccea45fd03820b33eee35b77e3bb154e10ea46 /lib/swiotlb.c | |
| parent | b284d4d5a6785f8cd07eda2646a95782373cd01e (diff) | |
| download | linux-9e7f06c8beee304ee21b791653fefcd713f48b9a.tar.bz2 | |
swiotlb: fix unexpected swiotlb_alloc_coherent failures
The code refactoring by commit 0176adb00406 ("swiotlb: refactor coherent
buffer allocation") made swiotlb_alloc_buffer almost always failing due
to a thinko: namely, the function evaluates the dma_coherent_ok call
incorrectly and dealing as if it's invalid. This ends up with weird
errors like iwlwifi probe failure or amdgpu screen flickering.
This patch corrects the logic error.
Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1088658
Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1088902
Fixes: 0176adb00406 ("swiotlb: refactor coherent buffer allocation")
Cc: <stable@vger.kernel.org> # v4.16+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'lib/swiotlb.c')
| -rw-r--r-- | lib/swiotlb.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 47aeb04c1997..de7cc540450f 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -719,7 +719,7 @@ swiotlb_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle, goto out_warn; *dma_handle = __phys_to_dma(dev, phys_addr); - if (dma_coherent_ok(dev, *dma_handle, size)) + if (!dma_coherent_ok(dev, *dma_handle, size)) goto out_unmap; memset(phys_to_virt(phys_addr), 0, size); |