[PATCH v6 18/22] dma: of: Probe DMA controllers on demand
From: Tomeu Vizoso <hidden>
Date: 2015-09-21 14:05:51
Also in:
linux-acpi, linux-devicetree, lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
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 <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 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