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| author | Sricharan R <sricharan@codeaurora.org> | 2019-06-28 17:39:46 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-10 09:53:48 +0200 |
| commit | 018c968de710af1372d456ededc0a575ee038b92 (patch) | |
| tree | 49f5d78b79de50b808dc6ab10fc2b13663bc7a0e | |
| parent | 870de149950551a3f9735f359b6440e69ab7ccf9 (diff) | |
| download | linux-stable-018c968de710af1372d456ededc0a575ee038b92.tar.gz linux-stable-018c968de710af1372d456ededc0a575ee038b92.tar.bz2 linux-stable-018c968de710af1372d456ededc0a575ee038b92.zip | |
dmaengine: qcom: bam_dma: Fix completed descriptors count
commit f6034225442c4a87906d36e975fd9e99a8f95487 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/dma/qcom/bam_dma.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c index 1617715aa6e0..489c8fa4d2e2 100644 --- a/drivers/dma/qcom/bam_dma.c +++ b/drivers/dma/qcom/bam_dma.c @@ -808,6 +808,9 @@ 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 */ |