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dmaengine/dw_dmac: don't scan descriptors if no xfers in progress

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Some hardware (picoChip picoXCell in particular) sometimes has
the block transfer complete bit being set for a channel after the
whole transfer has completed. If we don't have any transfers in the
active list then don't bother to scan the descriptors. This often
happens in normal operation and doesn't require the channel to be
reset.

v2: cleanup whitespace

Signed-off-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jamie Iles 2011-01-21 14:11:52 +00:00 committed by Dan Williams
parent e8a7e48bb2
commit 087809fce2
1 changed files with 3 additions and 0 deletions
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drivers/dma/dw_dmac.c
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@ -291,6 +291,9 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
return;
}
if (list_empty(&dwc->active_list))
return;
dev_vdbg(chan2dev(&dwc->chan), "scan_descriptors: llp=0x%x\n", llp);
list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {