linux-kernel - [PATCH 5.4 58/58] pinctrl: stm32: use valid pin identifier in stm32_pinctrl

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Message-Id: <20211025190947.321499484@linuxfoundation.org>
Date:   Mon, 25 Oct 2021 21:15:15 +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,
        Fabien Dessenne <fabien.dessenne@...s.st.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 5.4 58/58] pinctrl: stm32: use valid pin identifier in stm32_pinctrl_resume()

From: Fabien Dessenne <fabien.dessenne@...s.st.com>

commit c370bb474016ab9edfdabd7c08a88dd13a71ddbd upstream.

When resuming from low power, the driver attempts to restore the
configuration of some pins. This is done by a call to:
  stm32_pinctrl_restore_gpio_regs(struct stm32_pinctrl *pctl, u32 pin)
where 'pin' must be a valid pin value (i.e. matching some 'groups->pin').
Fix the current implementation which uses some wrong 'pin' value.

Fixes: e2f3cf18c3e2 ("pinctrl: stm32: add suspend/resume management")
Signed-off-by: Fabien Dessenne <fabien.dessenne@...s.st.com>
Link: https://lore.kernel.org/r/20211008122517.617633-1-fabien.dessenne@foss.st.com
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pinctrl/stm32/pinctrl-stm32.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -1554,8 +1554,8 @@ int __maybe_unused stm32_pinctrl_resume(
 	struct stm32_pinctrl_group *g = pctl->groups;
 	int i;
 
-	for (i = g->pin; i < g->pin + pctl->ngroups; i++)
-		stm32_pinctrl_restore_gpio_regs(pctl, i);
+	for (i = 0; i < pctl->ngroups; i++, g++)
+		stm32_pinctrl_restore_gpio_regs(pctl, g->pin);
 
 	return 0;
 }