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List: dmaengine
Subject: Re: [PATCH] dmaengine: qcom: bam_dma: Fix completed descriptors count
From: Srinivas Kandagatla <srinivas.kandagatla () linaro ! org>
Date: 2019-06-28 12:26:48
Message-ID: 6cc5080c-e72f-c97c-715c-9169508cf2d9 () linaro ! org
[Download RAW message or body]
On 28/06/2019 13:09, Sricharan R wrote:
> 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>
Thanks for the patch, It works for me now!
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
--srini
> ---
> 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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