From a197f3c7d48c0c1f45076ea47533a76ba9b1a959 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Fri, 18 Mar 2016 14:26:33 +0200 Subject: [PATCH] dmaengine: hsu: correct residue calculation of active descriptor The commit f0579c8ceaf1 ("dmaengine: hsu: speed up residue calculation") speeded up calculation of the queued descriptor but broke the initial residue value for active descriptor. In accordance with documentation the hardware descriptor is updated each time DMA transfered some bytes. It means we have to calculate a sum of lengths of non-submitted hardware descriptors and whatever current values in the hardware. Do this straightforward. Fixes: f0579c8ceaf1 ("dmaengine: hsu: speed up residue calculation") Cc: stable@vger.kernel.org Signed-off-by: Andy Shevchenko Signed-off-by: Vinod Koul --- drivers/dma/hsu/hsu.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c index c7643e022578..b3b212146620 100644 --- a/drivers/dma/hsu/hsu.c +++ b/drivers/dma/hsu/hsu.c @@ -254,10 +254,13 @@ static void hsu_dma_issue_pending(struct dma_chan *chan) static size_t hsu_dma_active_desc_size(struct hsu_dma_chan *hsuc) { struct hsu_dma_desc *desc = hsuc->desc; - size_t bytes = desc->length; + size_t bytes = 0; int i; - i = desc->active % HSU_DMA_CHAN_NR_DESC; + for (i = desc->active; i < desc->nents; i++) + bytes += desc->sg[i].len; + + i = HSU_DMA_CHAN_NR_DESC - 1; do { bytes += hsu_chan_readl(hsuc, HSU_CH_DxTSR(i)); } while (--i >= 0); -- 2.20.1