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Commit 975faaeb authored by George Cherian's avatar George Cherian Committed by Vinod Koul
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dma: cppi41: start tear down only if channel is busy 



Start the channel tear down only if the channel is busy, else just
bail out. In some cases its seen that by the time the tear down is
initiated the cppi completes the DMA, especially in ISOCH transfers.

Signed-off-by: default avatarGeorge Cherian <george.cherian@ti.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent f967d104

drivers/dma/cppi41.c

+5 −2
Original line number Diff line number Diff line
@@ -620,12 +620,15 @@ static int cppi41_stop_chan(struct dma_chan *chan) 
	u32 desc_phys;

	int ret;



	desc_phys = lower_32_bits(c->desc_phys);

	desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);

	if (!cdd->chan_busy[desc_num])

		return 0;



	ret = cppi41_tear_down_chan(c);

	if (ret)

		return ret;



	desc_phys = lower_32_bits(c->desc_phys);

	desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc);

	WARN_ON(!cdd->chan_busy[desc_num]);

	cdd->chan_busy[desc_num] = NULL;