linux-kernel - [PATCH v2 2/7] gpio: mockup: tweak gpio_mockup_event

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Date:   Tue, 30 May 2017 10:58:35 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH v2 2/7] gpio: mockup: tweak gpio_mockup_event_write()

Invert the logic of the irq_enabled check and only access the private
data after the input is sanitized.

Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
---
 drivers/gpio/gpio-mockup.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index da76267..d78e8e0 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -210,24 +210,23 @@ static ssize_t gpio_mockup_event_write(struct file *file,
 	struct gpio_chip *gc;
 	int rv, val;
 
-	sfile = file->private_data;
-	priv = sfile->private;
-	desc = priv->desc;
-	chip = priv->chip;
-	gc = &chip->gc;
-
 	rv = kstrtoint_from_user(usr_buf, size, 0, &val);
 	if (rv)
 		return rv;
 	if (val != 0 && val != 1)
 		return -EINVAL;
 
-	if (!chip->lines[priv->offset].irq_enabled)
-		return size;
+	sfile = file->private_data;
+	priv = sfile->private;
+	desc = priv->desc;
+	chip = priv->chip;
+	gc = &chip->gc;
 
-	gpiod_set_value_cansleep(desc, val);
-	priv->chip->irq_ctx.irq = gc->irq_base + priv->offset;
-	irq_work_queue(&priv->chip->irq_ctx.work);
+	if (chip->lines[priv->offset].irq_enabled) {
+		gpiod_set_value_cansleep(desc, val);
+		priv->chip->irq_ctx.irq = gc->irq_base + priv->offset;
+		irq_work_queue(&priv->chip->irq_ctx.work);
+	}
 
 	return size;
 }
-- 
2.9.3