Commit ec8ca8e3 authored by Peter Ujfalusi's avatar Peter Ujfalusi Committed by Vinod Koul
Browse files

dmaengine: dma_request_chan_by_mask() to handle deferred probing 



If there are no DMA devices registered yet, return with EPROBE_DEFER
similarly to the case when requesting a slave channel.

Signed-off-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent d8095f94

drivers/dma/dmaengine.c

+8 −2
Original line number Diff line number Diff line
@@ -770,8 +770,14 @@ struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask) 
		return ERR_PTR(-ENODEV);



	chan = __dma_request_channel(mask, NULL, NULL);

	if (!chan)

	if (!chan) {

		mutex_lock(&dma_list_mutex);

		if (list_empty(&dma_device_list))

			chan = ERR_PTR(-EPROBE_DEFER);

		else

			chan = ERR_PTR(-ENODEV);

		mutex_unlock(&dma_list_mutex);

	}



	return chan;

}