From 569432efa7975f5795efb8142134f5a098942381 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 3 Mar 2011 15:47:17 +0530 Subject: [PATCH] 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 Signed-off-by: Vinod Koul --- drivers/dma/dw_dmac.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index 942b50f57f21..2b0d5e99ae71 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -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; -- 2.20.1