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| author | Stephen Barber <smbarber@chromium.org> | 2016-11-01 16:44:27 -0700 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-11-14 10:30:06 +0530 |
| commit | c44da03dd517c11c2b3525937b0a241fc1c69399 (patch) | |
| tree | a20a9a2e69c0dfc232978911ee4ff480aeb8729c /drivers/dma/pl330.c | |
| parent | 9a1a34f3c8612864f18a71febc134957a03eca64 (diff) | |
| download | linux-stable-c44da03dd517c11c2b3525937b0a241fc1c69399.tar.gz linux-stable-c44da03dd517c11c2b3525937b0a241fc1c69399.tar.bz2 linux-stable-c44da03dd517c11c2b3525937b0a241fc1c69399.zip | |
dmaengine: pl330: Handle xferred count if DMAMOV hasn't finished
After executing DMAGO it's possible that a request can come in for the
current xferred count, but if that happens too soon then DMAMOV SAR/DAR
may not have yet completed. If that happens, we should explicitly return 0
since nothing has been transferred yet.
Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/pl330.c')
| -rw-r--r-- | drivers/dma/pl330.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 030fe05ed43b..458a712a9da1 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -2263,6 +2263,11 @@ static int pl330_get_current_xferred_count(struct dma_pl330_chan *pch, } pm_runtime_mark_last_busy(pch->dmac->ddma.dev); pm_runtime_put_autosuspend(pl330->ddma.dev); + + /* If DMAMOV hasn't finished yet, SAR/DAR can be zero */ + if (!val) + return 0; + return val - addr; } |