[PATCH] char: hw_random: Fix missing check during driver release

Aditya Pakki
2018-12-26T17:23:51Z

devres_release can return -ENOENT if the device is not freed. The fix
throws a warning consistent with other invocations.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
drivers/char/hw_random/core.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 95be7228f327..582d983fa93f 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -578,7 +578,11 @@ EXPORT_SYMBOL_GPL(devm_hwrng_register);

void devm_hwrng_unregister(struct device *dev, struct hwrng *rng)
{
- devres_release(dev, devm_hwrng_release, devm_hwrng_match, rng);
+ int rc;
+
+ rc = devres_release(dev, devm_hwrng_release, devm_hwrng_match, rng);
+ if (rc)
+ WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_hwrng_unregister);

--
2.17.1