[PATCH 20/21] dma: of: Probe DMA controllers on demand

Tomeu Vizoso
2015-05-25T14:59:30Z

When looking up a DMA controller through its DT node, ensure that the
corresponding device has been registered.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
---
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 cbd4a8a..2bdb3da 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);
@@ -174,6 +175,8 @@ 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_device_ensure(dma_spec.np);
+
mutex_lock(&of_dma_lock);
ofdma = of_dma_find_controller(&dma_spec);

--
2.4.1