[PATCH] hwrng: bcm2835: Handle deferred clock properly

[Stefan Wahren]

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.wah...@i2se.com>
---
 drivers/char/hw_random/bcm2835-rng.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/char/hw_random/bcm2835-rng.c 
b/drivers/char/hw_random/bcm2835-rng.c
index 7a84cec..6767d96 100644
--- 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;
-- 
2.7.4