gpio: gpiolib-of: Fix refcount bugs in of_mm_gpiochip_add_data()

We should use of_node_get() when a new reference of device_node
is created. It is noted that the old reference stored in
'mm_gc->gc.of_node' should also be decreased.

This patch is based on the fact that there is a call site in function
'qe_add_gpiochips()' of src file 'drivers\soc\fsl\qe\gpio.c'. In this
function, of_mm_gpiochip_add_data() is contained in an iteration of
for_each_compatible_node() which will automatically increase and
decrease the refcount. So we need additional of_node_get() for the
reference escape in of_mm_gpiochip_add_data().

Fixes: a19e3da5bc5f ("of/gpio: Kill of_gpio_chip and add members directly to gpio_chip")
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 23b8de98bf7c7c86259ad87cae8a0af4c86caf68..f80307be37d5b5f262ec557c952407971652077d 100644 (file)
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -860,7 +860,8 @@ int of_mm_gpiochip_add_data(struct device_node *np,
        if (mm_gc->save_regs)
                mm_gc->save_regs(mm_gc);
 
-       mm_gc->gc.of_node = np;
+       of_node_put(mm_gc->gc.of_node);
+       mm_gc->gc.of_node = of_node_get(np);
 
        ret = gpiochip_add_data(gc, data);
        if (ret)
@@ -868,6 +869,7 @@ int of_mm_gpiochip_add_data(struct device_node *np,
 
        return 0;
 err2:
+       of_node_put(np);
        iounmap(mm_gc->regs);
 err1:
        kfree(gc->label);