linux-kernel - Re: [PATCH 05/14] HID: i2c-hid: fix i2c_hid

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Date:	Wed, 5 Dec 2012 10:56:53 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	linux-input@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/14] HID: i2c-hid: fix i2c_hid_dbg macro

On Tue, 4 Dec 2012, Jean Delvare wrote:

> > This avoids the problematic case:
> > 
> > if (condition)
> > 	i2c_hid_dbg(ihid, "Blah blah %d\n", i);
> > else
> > 	do_something_very_important();
> > 
> > Which looks correct, however with the previous macro definition,
> > this expands to the unexpected:
> > 
> > if (condition) {
> > 	if (debug)	\
> > 		dev_printk(KERN_DEBUG, &ihid->client->dev,
> > 				"Blah blah %d\n", i);
> > 	else
> > 		do_something_very_important();
> > }
> > 
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>
> > ---
> >  drivers/hid/i2c-hid/i2c-hid.c | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
> > index 9ee6555..54950be 100644
> > --- a/drivers/hid/i2c-hid/i2c-hid.c
> > +++ b/drivers/hid/i2c-hid/i2c-hid.c
> > @@ -50,9 +50,11 @@ static bool debug;
> >  module_param(debug, bool, 0444);
> >  MODULE_PARM_DESC(debug, "print a lot of debug information");
> >  
> > -#define i2c_hid_dbg(ihid, fmt, arg...)	\
> > -	if (debug)			\
> > -		dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg)
> > +#define i2c_hid_dbg(ihid, fmt, arg...)					  \
> > +do {									  \
> > +	if (debug)							  \
> > +		dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
> > +} while (0)
> >  
> >  struct i2c_hid_desc {
> >  	__le16 wHIDDescLength;
> 
> Reviewed-by: Jean Delvare <khali@...ux-fr.org>

Applied.

-- 
Jiri Kosina
SUSE Labs
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