linux-kernel - [PATCH 4.8 087/140] soc/fsl/qe: fix gpio save

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Date:   Wed, 26 Oct 2016 14:22:27 +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, Christophe Leroy <christophe.leroy@....fr>,
        Linus Walleij <linus.walleij@...aro.org>,
        Scott Wood <oss@...error.net>
Subject: [PATCH 4.8 087/140] soc/fsl/qe: fix gpio save_regs functions

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe Leroy <christophe.leroy@....fr>

commit 5dc6f3fedee58efa343e822558fc3e2f0eb2ad1f upstream.

of_mm_gpiochip_add_data() calls mm_gc->save_regs() before
setting the data. Therefore ->save_regs() cannot use
gpiochip_get_data()

An Oops is encountered without this fix.

fixes: 1e714e54b5ca5 ("powerpc: qe_lib-gpio: use gpiochip data pointer")
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Scott Wood <oss@...error.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/soc/fsl/qe/gpio.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/soc/fsl/qe/gpio.c
+++ b/drivers/soc/fsl/qe/gpio.c
@@ -41,7 +41,8 @@ struct qe_gpio_chip {
 
 static void qe_gpio_save_regs(struct of_mm_gpio_chip *mm_gc)
 {
-	struct qe_gpio_chip *qe_gc = gpiochip_get_data(&mm_gc->gc);
+	struct qe_gpio_chip *qe_gc =
+		container_of(mm_gc, struct qe_gpio_chip, mm_gc);
 	struct qe_pio_regs __iomem *regs = mm_gc->regs;
 
 	qe_gc->cpdata = in_be32(&regs->cpdata);