hwrng: bcm2835 - Handle deferred clock properly

In case the probe of the clock is deferred, we would assume it is
optional. This is wrong, so defer the probe of this driver until
the clock is available.

Fixes: 791af4f4907a ("hwrng: bcm2835 - Manage an optional clock")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
index 7a84cec30c3a2e10bf77f69ccdee5e61b47c8021..6767d965c36c5254e052c84d1b9577af7c0ca5e1 100644 (file)
--- a/drivers/char/hw_random/bcm2835-rng.c
+++ b/drivers/char/hw_random/bcm2835-rng.c
@@ -163,6 +163,8 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
 
        /* Clock is optional on most platforms */
        priv->clk = devm_clk_get(dev, NULL);
+       if (IS_ERR(priv->clk) && PTR_ERR(priv->clk) == -EPROBE_DEFER)
+               return -EPROBE_DEFER;
 
        priv->rng.name = pdev->name;
        priv->rng.init = bcm2835_rng_init;