linux-kernel - [PATCH AUTOSEL 5.10 10/12] gpio: Revert regression in sysfs-gpio (gpiolib.c)

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Date:   Wed, 16 Mar 2022 10:16:34 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marcelo Roberto Jimenez <marcelo.jimenez@...il.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Sasha Levin <sashal@...nel.org>, linus.walleij@...aro.org,
        linux-gpio@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 10/12] gpio: Revert regression in sysfs-gpio (gpiolib.c)

From: Marcelo Roberto Jimenez <marcelo.jimenez@...il.com>

[ Upstream commit fc328a7d1fcce263db0b046917a66f3aa6e68719 ]

Some GPIO lines have stopped working after the patch
commit 2ab73c6d8323f ("gpio: Support GPIO controllers without pin-ranges")

And this has supposedly been fixed in the following patches
commit 89ad556b7f96a ("gpio: Avoid using pin ranges with !PINCTRL")
commit 6dbbf84603961 ("gpiolib: Don't free if pin ranges are not defined")

But an erratic behavior where some GPIO lines work while others do not work
has been introduced.

This patch reverts those changes so that the sysfs-gpio interface works
properly again.

Signed-off-by: Marcelo Roberto Jimenez <marcelo.jimenez@...il.com>
Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpiolib.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index af5bb8fedfea..ac69ec8fb37a 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1804,11 +1804,6 @@ static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc)
  */
 int gpiochip_generic_request(struct gpio_chip *gc, unsigned offset)
 {
-#ifdef CONFIG_PINCTRL
-	if (list_empty(&gc->gpiodev->pin_ranges))
-		return 0;
-#endif
-
 	return pinctrl_gpio_request(gc->gpiodev->base + offset);
 }
 EXPORT_SYMBOL_GPL(gpiochip_generic_request);
@@ -1820,11 +1815,6 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_request);
  */
 void gpiochip_generic_free(struct gpio_chip *gc, unsigned offset)
 {
-#ifdef CONFIG_PINCTRL
-	if (list_empty(&gc->gpiodev->pin_ranges))
-		return;
-#endif
-
 	pinctrl_gpio_free(gc->gpiodev->base + offset);
 }
 EXPORT_SYMBOL_GPL(gpiochip_generic_free);
-- 
2.34.1