linux-kernel - [PATCH] dmaengine: qcom: bam_dma: Fix completed descriptors count

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Date:   Fri, 28 Jun 2019 17:39:46 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     agross@...nel.org, david.brown@...aro.org,
        dan.j.williams@...el.com, vkoul@...nel.org,
        linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, srinivas.kandagatla@...aro.org
Cc:     stable@...r.kernel.org, sricharan@...eaurora.org
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@...r.kernel.org
Reported-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Signed-off-by: Sricharan R <sricharan@...eaurora.org>
---
 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 4b43844..8e90a40 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 */
-- 
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