Commit c44da03d authored Nov 01, 2016 by Stephen Barber Committed by Vinod Koul Nov 14, 2016

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>

parent 9a1a34f3

drivers/dma/pl330.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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