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dw_dmac: Calling dwc_scan_descriptors from dwc_tx_status() after taking lock 

Lock must be taken before calling dwc_scan_descriptors, as this may
access/modify shared data and queues. dwc_tx_status wasn't taking lock before
calling this routine. This patch add code that takes lock before calling
dwc_scan_descriptors.

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 2011-03-03 15:47:17 +05:30 committed by Vinod Koul
parent f336e42f73
commit 569432efa7
1 changed files with 2 additions and 0 deletions
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2
drivers/dma/dw_dmac.c
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@ -836,7 +836,9 @@ dwc_tx_status(struct dma_chan *chan,
ret = dma_async_is_complete(cookie, last_complete, last_used);
if (ret != DMA_SUCCESS) {
spin_lock_bh(&dwc->lock);
dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
spin_unlock_bh(&dwc->lock);
last_complete = dwc->completed;
last_used = chan->cookie;