From 5077ac561c6e8f2697ad1b631e05989b974aa657 Mon Sep 17 00:00:00 2001 From: Sricharan R Date: Fri, 28 Jun 2019 17:39:46 +0530 Subject: [PATCH] dmaengine: qcom: bam_dma: Fix completed descriptors count One space is left unused in circular FIFO to differentiate 'full' and 'empty' cases. So take that in to account while counting for the descriptors completed. Fixes the issue reported here, https://lkml.org/lkml/2019/6/18/669 Cc: stable@vger.kernel.org Reported-by: Srinivas Kandagatla Signed-off-by: Sricharan R Tested-by: Srinivas Kandagatla Signed-off-by: Vinod Koul --- drivers/dma/qcom/bam_dma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c index 4b43844f6af53..8e90a405939df 100644 --- a/drivers/dma/qcom/bam_dma.c +++ b/drivers/dma/qcom/bam_dma.c @@ -799,6 +799,9 @@ static u32 process_channel_irqs(struct bam_device *bdev) /* Number of bytes available to read */ avail = CIRC_CNT(offset, bchan->head, MAX_DESCRIPTORS + 1); + if (offset < bchan->head) + avail--; + list_for_each_entry_safe(async_desc, tmp, &bchan->desc_list, desc_node) { /* Not enough data to read */ -- 2.39.5