linux-kernel - [PATCH 5.15 019/913] Revert "gpio: Revert regression in sysfs-gpio (gpiolib.c)"

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Date:   Tue,  5 Apr 2022 09:18:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bartosz Golaszewski <brgl@...ev.pl>,
        Michael Walle <michael@...le.cc>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        Marcelo Roberto Jimenez <marcelo.jimenez@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 5.15 019/913] Revert "gpio: Revert regression in sysfs-gpio (gpiolib.c)"

From: Bartosz Golaszewski <brgl@...ev.pl>

[ Upstream commit 56e337f2cf1326323844927a04e9dbce9a244835 ]

This reverts commit fc328a7d1fcce263db0b046917a66f3aa6e68719.

This commit - while attempting to fix a regression - has caused a number
of other problems. As the fallout from it is more significant than the
initial problem itself, revert it for now before we find a correct
solution.

Link: https://lore.kernel.org/all/20220314192522.GA3031157@roeck-us.net/
Link: https://lore.kernel.org/stable/20220314155509.552218-1-michael@walle.cc/
Link: https://lore.kernel.org/all/20211217153555.9413-1-marcelo.jimenez@gmail.com/
Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
Reported-and-bisected-by: Guenter Roeck <linux@...ck-us.net>
Reported-by: Michael Walle <michael@...le.cc>
Cc: Thorsten Leemhuis <linux@...mhuis.info>
Cc: Marcelo Roberto Jimenez <marcelo.jimenez@...il.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpiolib.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 12b59cdffdf3..358f0ad9d0f8 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1660,6 +1660,11 @@ static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc)
  */
 int gpiochip_generic_request(struct gpio_chip *gc, unsigned int 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);
@@ -1671,6 +1676,11 @@ EXPORT_SYMBOL_GPL(gpiochip_generic_request);
  */
 void gpiochip_generic_free(struct gpio_chip *gc, unsigned int 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