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dmaengine/dw_dmac fix: dwc_scan_descriptors must compare first desc address also with llp 

dwc_scan_descriptors scans all descriptors from active_list in case transfer is
not completed.  It compares first_desc->lli.llp, and then all childrens of its
tx_list. But it doesn't compare its own address, i.e. first_desc->txd.phys, as
this is what we have initially programmed into the controller register. So this
causes dma to stop and finish a transfer, which was never started. And thus
fail.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Viresh Kumar 2011-03-24 11:32:15 +05:30 committed by Vinod Koul
parent 3ea205c449
commit 84adccfb8c
1 changed files with 5 additions and 0 deletions
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5
drivers/dma/dw_dmac.c
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@ -304,6 +304,11 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
dev_vdbg(chan2dev(&dwc->chan), "scan_descriptors: llp=0x%x\n", llp);
list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {
/* check first descriptors addr */
if (desc->txd.phys == llp)
return;
/* check first descriptors llp */
if (desc->lli.llp == llp)
/* This one is currently in progress */
return;