[PATCH 4/7] dmaengine: at_xdmac: fix a bug in transfer residue computation
From: Ludovic Desroches <hidden>
Date: 2014-11-13 10:52:42
Also in:
linux-devicetree
Subsystem:
dma generic offload engine subsystem, microchip at91 dma drivers, the rest · Maintainers:
Vinod Koul, Ludovic Desroches, Linus Torvalds
From: Cyrille Pitchen <redacted> The total size of the transfer was wrong in at_xdmac_prep_slave_sg() resulting in bad computation of the transfer residue by at_xdmac_tx_status(). Signed-off-by: Cyrille Pitchen <redacted> Signed-off-by: Ludovic Desroches <redacted> --- drivers/dma/at_xdmac.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index fa9d75a..bf2aacb 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c@@ -562,6 +562,7 @@ at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, struct scatterlist *sg; int i; u32 cfg; + unsigned int xfer_size = 0; if (!sgl) return NULL;
@@ -637,12 +638,13 @@ at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", __func__, desc, first); list_add_tail(&desc->desc_node, &first->descs_list); + xfer_size += len; } spin_unlock_bh(&atchan->lock); first->tx_dma_desc.flags = flags; - first->xfer_size = sg_len; + first->xfer_size = xfer_size; first->direction = direction; return &first->tx_dma_desc;
--
2.0.3