From: Peter Ujfalusi <peter.ujfalusi@ti.com>
Date: Wed, 18 Jul 2018 09:29:57 +0000 (+0300)
Subject: dmaengine: dma_request_chan_by_mask() to handle deferred probing
X-Git-Tag: v4.19-rc1~95^2~13
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ec8ca8e3b4809bf603814a8834bfd3891e1ccf74;p=thirdparty%2Fkernel%2Flinux.git

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: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 84ac38dbdb65c..504420f213ff7 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -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)
-		chan = ERR_PTR(-ENODEV);
+	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;
 }