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gpiolib: No need to call gpiochip_remove_pin_ranges() twice 

commit 2f4133bb5f 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: e93fa3f243 ("gpiolib: remove duplicate pin range code")
Depends-on: f7299d441a ("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>
5.4-rM2-2.2.x-imx-squashed
Andy Shevchenko 2019-11-05 20:06:54 +02:00 committed by Greg Kroah-Hartman
parent 37bb3c4646
commit ddb46d9a90
2 changed files with 3 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpio/gpiolib-of.c
View File

@ -909,16 +909,13 @@ int of_gpiochip_add(struct gpio_chip *chip)
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);
}

3
drivers/gpio/gpiolib.c
View File

@ -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 *chip)
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