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authorDave Jiang <dave.jiang@intel.com>2016-07-25 19:33:57 +0200
committerVinod Koul <vinod.koul@intel.com>2016-08-08 04:41:43 +0200
commit9b335978f7081cd4fe264709599a18073e12fee2 (patch)
tree643e45c4e51861d7d7856082ee0b48eeefd271c4 /drivers/dma/fsldma.c
parentdmaengine: sh_shdma-base: convert callback to helper function (diff)
downloadlinux-9b335978f7081cd4fe264709599a18073e12fee2.tar.xz
linux-9b335978f7081cd4fe264709599a18073e12fee2.zip
dmaengine: fsldma: move unmap to before callback
Completion callback should happen after dma_descriptor_unmap() has happened. This allow the cache invalidate to happen and ensure that the data accessed by the upper layer is in memory that was from DMA rather than stale data. On some architecture this is done by the hardware, however we should make the code consistent to not cause confusion. Signed-off-by: Dave Jiang <dave.jiang@intel.com> Acked-by: Li Yang <leoyang.li@nxp.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/fsldma.c')
-rw-r--r--drivers/dma/fsldma.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index ef808665aeca..b557ccbaa1b5 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -516,9 +516,9 @@ static dma_cookie_t fsldma_run_tx_complete_actions(struct fsldma_chan *chan,
if (txd->cookie > 0) {
ret = txd->cookie;
+ dma_descriptor_unmap(txd);
/* Run the link descriptor callback function */
dmaengine_desc_get_callback_invoke(txd, NULL);
- dma_descriptor_unmap(txd);
}
/* Run any dependencies */