linux-kernel - Re: [PATCH] staging: iio: light: Fix compiler warning in tsl2563.c

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Date:	Fri, 2 Sep 2011 12:41:07 +0300
From:	"Maxin B. John" <maxin.john@...il.com>
To:	Dan Carpenter <error27@...il.com>
Cc:	Jonathan Cameron <jic23@....ac.uk>,
	Bryan Freed <bfreed@...omium.org>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	linux-iio@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	devel@...verdev.osuosl.org,
	Amit Kucheria <amit.kucheria@...durent.com>
Subject: Re: [PATCH] staging: iio: light: Fix compiler warning in tsl2563.c

> Don't overwrite the error code.  For example, the lower layers can
> return -EAGAIN and that's more useful than just returning -EIO every
> time.
Ahh.. Thanks a lot for explaining this.

> Your fix works, but it's not very clean.  Just add a "*id = ret;"
> line before the "return 0;" and that's it.  (It doesn't make sense
> to pass a pointer to "id" and not use it).
Dan, yes, I agree with you. This fix is much much better than what I 
had in my mind.

> Yikes - I wonder why my various compilers don't throw that up.
I guess, in "iio-blue.git" tree, the 'id = 0' suppresses this warning.

Signed-off-by: Maxin B. John <maxin.john@...il.com>
---
diff --git a/drivers/staging/iio/light/tsl2563.c b/drivers/staging/iio/light/tsl2563.c
index f25243b..55012ff 100644
--- a/drivers/staging/iio/light/tsl2563.c
+++ b/drivers/staging/iio/light/tsl2563.c
@@ -226,7 +226,7 @@ static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
 	ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
 	if (ret < 0)
 		return ret;
-
+	*id = ret;
 	return 0;
 }
 
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