[PATCH AUTOSEL 4.19 228/671] hwrng: bcm2835 - fix probe as platform device

Sasha Levin
2020-01-16T19:04:15Z

From: Jonas Gorski <jonas.gorski@gmail.com>

[ Upstream commit 984798de671a927ac73da31096a150df42e6aaf3 ]

BCM63XX (MIPS) does not use device tree, so there cannot be any
of_device_id, causing the driver to fail on probe:

[ 0.904564] bcm2835-rng: probe of bcm63xx-rng failed with error -22

Fix this by checking for match data only if we are probing from device
tree.

Fixes: 8705f24f7b57 ("hwrng: bcm2835 - Enable BCM2835 RNG to work on BCM63xx platforms")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/char/hw_random/bcm2835-rng.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
index 6767d965c36c..19bde680aee1 100644
--- a/drivers/char/hw_random/bcm2835-rng.c
+++ b/drivers/char/hw_random/bcm2835-rng.c
@@ -171,14 +171,16 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
priv->rng.read = bcm2835_rng_read;
priv->rng.cleanup = bcm2835_rng_cleanup;

- rng_id = of_match_node(bcm2835_rng_of_match, np);
- if (!rng_id)
- return -EINVAL;
-
- /* Check for rng init function, execute it */
- of_data = rng_id->data;
- if (of_data)
- priv->mask_interrupts = of_data->mask_interrupts;
+ if (dev_of_node(dev)) {
+ rng_id = of_match_node(bcm2835_rng_of_match, np);
+ if (!rng_id)
+ return -EINVAL;
+
+ /* Check for rng init function, execute it */
+ of_data = rng_id->data;
+ if (of_data)
+ priv->mask_interrupts = of_data->mask_interrupts;
+ }

/* register driver */
err = devm_hwrng_register(dev, &priv->rng);
--
2.20.1