From: Peter Griffin peter.griffin@linaro.org
[ Upstream commit e28c28a34ee9fa2ea671a20e5e7064e6220d55e7 ]
of_parse_phandle() returns a device_node with refcount incremented, which the callee needs to call of_node_put() on when done. We should only call of_node_put() when the property argument is provided though as otherwise nothing has taken a reference on the node.
Fixes: f36e789a1f8d ("mfd: altera-sysmgr: Add SOCFPGA System Manager") Signed-off-by: Peter Griffin peter.griffin@linaro.org Link: https://lore.kernel.org/r/20240220115012.471689-4-peter.griffin@linaro.org Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mfd/altera-sysmgr.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/mfd/altera-sysmgr.c b/drivers/mfd/altera-sysmgr.c index 591b300d90953..59efe7d5dcaa9 100644 --- a/drivers/mfd/altera-sysmgr.c +++ b/drivers/mfd/altera-sysmgr.c @@ -110,7 +110,9 @@ struct regmap *altr_sysmgr_regmap_lookup_by_phandle(struct device_node *np,
dev = driver_find_device_by_of_node(&altr_sysmgr_driver.driver, (void *)sysmgr_np); - of_node_put(sysmgr_np); + if (property) + of_node_put(sysmgr_np); + if (!dev) return ERR_PTR(-EPROBE_DEFER);