diff options
| author | Sylvain ETIENNE <Sylvain.ETIENNE@ingenico.com> | 2015-12-02 17:10:16 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-12-05 14:16:23 +0530 |
| commit | ef10b0b24143238c4457e0e60ec230b0fcc342a4 (patch) | |
| tree | 4c614490777d901053318c7b3da8a5cbeb56e452 /drivers/dma | |
| parent | f5a00eb71902292c5a77d7cc27bdafd09ba3c112 (diff) | |
| download | linux-ef10b0b24143238c4457e0e60ec230b0fcc342a4.tar.bz2 | |
dmaengine: at_xdmac: fix bad behavior in interleaved mode
When performing interleaved transfers with numf > 1, an extra line is
copied. The mbr.bc field is incremented once too often. The length of
the block is (BLEN+1) microblocks.
Signed-off-by: Sylvain ETIENNE <Sylvain.ETIENNE@ingenico.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Fixes: 4e5385784e69 ("dmaengine: at_xdmac: handle numf > 1")
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/at_xdmac.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index c344f89a77e8..bda49519b6de 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -965,7 +965,9 @@ at_xdmac_prep_interleaved(struct dma_chan *chan, NULL, src_addr, dst_addr, xt, xt->sgl); - for (i = 0; i < xt->numf; i++) + + /* Length of the block is (BLEN+1) microblocks. */ + for (i = 0; i < xt->numf - 1; i++) at_xdmac_increment_block_count(chan, first); dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", |