[PATCH 20/21] dma: of: Probe DMA controllers on demand
From: Tomeu Vizoso <hidden>
Date: 2015-05-25 14:59:30
Also in:
lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
When looking up a DMA controller through its DT node, ensure that the corresponding device has been registered. Signed-off-by: Tomeu Vizoso <redacted> --- 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