| Message ID | 1561723786-22500-1-git-send-email-sricharan@codeaurora.org (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | dmaengine: qcom: bam_dma: Fix completed descriptors count | expand |
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 */ >
On 28-06-19, 17:39, 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 Applied, thanks
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 */
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> --- drivers/dma/qcom/bam_dma.c | 3 +++ 1 file changed, 3 insertions(+)