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 <[email protected]>
---
drivers/dma/pl330.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 030fe05..458a712 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;
}
--
2.8.0.rc3.226.g39d4020