[PATCH master] mfd: syscon: don't register clocked syscon if geting clock fails

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

When of_syscon_register is called with check_clk=true, it will attempt
to attach the clock. If that fails, the newly allocated syscon is freed,
but a dangling pointer remained in the syscon_list.

Fix this by only registering the syscon in the successful case.

Fixes: b36b7b727192 ("mfd: syscon: clock peripheral if specified in device tree")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/mfd/syscon.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 3e12123b572e..3c2e1241fdff 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -74,8 +74,6 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
 	syscon_config.val_bits = reg_io_width * 8;
 	syscon_config.max_register = resource_size(&res) - reg_io_width;
 
-	list_add_tail(&syscon->list, &syscon_list);
-
 	syscon->regmap = regmap_init_mmio_clk(NULL, NULL, syscon->base,
 					      &syscon_config);
 
@@ -93,6 +91,8 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
 		}
 	}
 
+	list_add_tail(&syscon->list, &syscon_list);
+
 	return syscon;
 
 err_map:
-- 
2.39.2