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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 <srinivas.kandagatla@linaro.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Sricharan R 2019-06-28 17:39:46 +05:30 committed by Vinod Koul
parent 3f93a4f297
commit f603422544
1 changed files with 3 additions and 0 deletions
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3
drivers/dma/qcom/bam_dma.c
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@ -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 */