[PATCH 5.4 048/102] gpiolib: No need to call gpiochip_remove_pin_ranges() twice

Greg Kroah-Hartman
2020-01-24T09:39:57Z

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

commit 2f4133bb5f14f49a99acf0cc55b84996dbfb4dff upstream.

of_gpiochip_add(), when fails, calls gpiochip_remove_pin_ranges().

ADD:
gpiochip_add_data_with_key() ->
of_gpiochip_add() -> (ERROR path)
gpiochip_remove_pin_ranges()

At the same time of_gpiochip_remove() calls exactly the above mentioned
function unconditionally and so does gpiochip_remove().

REMOVE:
gpiochip_remove() ->
gpiochip_remove_pin_ranges()
of_gpiochip_remove() ->
gpiochip_remove_pin_ranges()

Since gpiochip_remove() calls gpiochip_remove_pin_ranges() unconditionally,
we have duplicate call to the same function when it's not necessary.

Move gpiochip_remove_pin_ranges() from of_gpiochip_add() to gpiochip_add()
to avoid duplicate calls and be consistent with the explicit call in
gpiochip_remove().

Fixes: e93fa3f24353 ("gpiolib: remove duplicate pin range code")
Depends-on: f7299d441a4d ("gpio: of: Fix of_gpiochip_add() error path")
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpio/gpiolib-of.c | 5 +----
drivers/gpio/gpiolib.c | 3 ++-
2 files changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -909,16 +909,13 @@ int of_gpiochip_add(struct gpio_chip *ch
of_node_get(chip->of_node);

ret = of_gpiochip_scan_gpios(chip);
- if (ret) {
+ if (ret)
of_node_put(chip->of_node);
- gpiochip_remove_pin_ranges(chip);
- }

return ret;
}

void of_gpiochip_remove(struct gpio_chip *chip)
{
- gpiochip_remove_pin_ranges(chip);
of_node_put(chip->of_node);
}
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1452,6 +1452,7 @@ err_remove_of_chip:
gpiochip_free_hogs(chip);
of_gpiochip_remove(chip);
err_free_gpiochip_mask:
+ gpiochip_remove_pin_ranges(chip);
gpiochip_free_valid_mask(chip);
err_remove_from_list:
spin_lock_irqsave(&gpio_lock, flags);
@@ -1507,8 +1508,8 @@ void gpiochip_remove(struct gpio_chip *c
gdev->chip = NULL;
gpiochip_irqchip_remove(chip);
acpi_gpiochip_remove(chip);
- gpiochip_remove_pin_ranges(chip);
of_gpiochip_remove(chip);
+ gpiochip_remove_pin_ranges(chip);
gpiochip_free_valid_mask(chip);
/*
* We accept no more calls into the driver from this point, so