Commit 049c0d57 authored Nov 05, 2014 by Srikanth Thokala Committed by Vinod Koul Nov 06, 2014

dmaengine: xilinx: vdma: Check if the segment list is empty in a descriptor



The segment list in a descriptor should be checked for empty, else
it will try to access invalid address for the first call.  This
patch fixes this issue.

Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

parent cd166280

drivers/dma/xilinx/xilinx_vdma.c

+5 −3

Original line number	Diff line number	Diff line
		@@ -971,9 +971,11 @@ xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
		hw->buf_addr = xt->src_start;

		/* Link the previous next descriptor to current */
		if (!list_empty(&desc->segments)) {
		prev = list_last_entry(&desc->segments,
		struct xilinx_vdma_tx_segment, node);
		prev->hw.next_desc = segment->phys;
		}

		/* Insert the segment into the descriptor segments list. */
		list_add_tail(&segment->node, &desc->segments);