[PATCH v5 19/23] dma: of: Probe DMA controllers on demand

From: Tomeu Vizoso
Date: Thu Sep 17 2015 - 08:59:56 EST


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@xxxxxxxxxxxxx>
---

Changes in v5: None
Changes in v4: None
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..e899832f7df3 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -16,6 +16,7 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/of_dma.h>

static LIST_HEAD(of_dma_list);
@@ -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_device_probe(dma_spec.np);
+
mutex_lock(&of_dma_lock);
ofdma = of_dma_find_controller(&dma_spec);

--
2.4.3

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