When looking up a DMA controller through its OF node, probe it if it
hasn't already.

The goal is to reduce deferred probes to a minimum, as it makes it very
cumbersome to find out why a device failed to probe, and can introduce
very big delays in when a critical device is probed.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
---

Changes in v3: None
Changes in v2: None

 drivers/dma/of-dma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 1e1f2986eba8..9cfc818b9dc8 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c

@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_dma.h>
+#include <linux/of_platform.h>
 
 static LIST_HEAD(of_dma_list);
 static DEFINE_MUTEX(of_dma_lock);

@@ -263,6 +264,8 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
 		if (of_dma_match_channel(np, name, i, &dma_spec))
 			continue;
 
+		of_platform_probe(dma_spec.np);
+
 		mutex_lock(&of_dma_lock);
 		ofdma = of_dma_find_controller(&dma_spec);
 

-- 
2.4.3

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