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    Subject[PATCH v4 18/22] dma: of: Probe DMA controllers on demand
    Date
    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@collabora.com>
    ---

    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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