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authorChristoph Hellwig <hch@lst.de>2018-12-07 00:39:32 +0300
committerChristoph Hellwig <hch@lst.de>2018-12-13 23:06:18 +0300
commit356da6d0cde3323236977fce54c1f9612a742036 (patch)
tree87ad8176833266fbaa038780d67aebcc490d0d64 /drivers/gpu/drm
parent190d4e5916a2d70a11009022b968fca948fb5dc7 (diff)
downloadlinux-356da6d0cde3323236977fce54c1f9612a742036.tar.xz
dma-mapping: bypass indirect calls for dma-direct
Avoid expensive indirect calls in the fast path DMA mapping operations by directly calling the dma_direct_* ops if we are using the directly mapped DMA operations. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/vmwgfx/vmwgfx_drv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 61a84b958d67..50637f372e9f 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -581,7 +581,7 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv)
dev_priv->map_mode = vmw_dma_map_populate;
- if (dma_ops->sync_single_for_cpu)
+ if (dma_ops && dma_ops->sync_single_for_cpu)
dev_priv->map_mode = vmw_dma_alloc_coherent;
#ifdef CONFIG_SWIOTLB
if (swiotlb_nr_tbl() == 0)