linux-gpio.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Linus Walleij <linus.walleij@linaro.org>
To: linux-gpio@vger.kernel.org, Alessandro Rubini <rubini@gnudd.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH 16/54] gpio: sta2x11: Be sure to clamp return value
Date: Tue, 22 Dec 2015 15:22:35 +0100	[thread overview]
Message-ID: <1450794155-23122-1-git-send-email-linus.walleij@linaro.org> (raw)

As we want gpio_chip .get() calls to be able to return negative
error codes and propagate to drivers, we need to go over all
drivers and make sure their return values are clamped to [0,1].
We do this by using the ret = !!(val) design pattern.

Cc: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpio/gpio-sta2x11.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-sta2x11.c b/drivers/gpio/gpio-sta2x11.c
index 55e47828ddfc..af0be81ad2b6 100644
--- a/drivers/gpio/gpio-sta2x11.c
+++ b/drivers/gpio/gpio-sta2x11.c
@@ -90,7 +90,7 @@ static int gsta_gpio_get(struct gpio_chip *gpio, unsigned nr)
 	struct gsta_regs __iomem *regs = __regs(chip, nr);
 	u32 bit = __bit(nr);
 
-	return readl(&regs->dat) & bit;
+	return !!(readl(&regs->dat) & bit);
 }
 
 static int gsta_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
-- 
2.4.3


                 reply	other threads:[~2015-12-22 14:22 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1450794155-23122-1-git-send-email-linus.walleij@linaro.org \
    --to=linus.walleij@linaro.org \
    --cc=linux-gpio@vger.kernel.org \
    --cc=rubini@gnudd.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).