linux-kernel - Re: [patch 2.6.29-rc] regulator: minor cleanup of virtual consumer

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Date:	Thu, 15 Jan 2009 16:13:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	david-b@...bell.net, broonie@...nsource.wolfsonmicro.com,
	lrg@...mlogic.co.uk, linux-kernel@...r.kernel.org
Subject: Re: [patch 2.6.29-rc] regulator: minor cleanup of virtual consumer

On Thu, 15 Jan 2009 16:10:22 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 14 Jan 2009 13:16:27 -0800
> David Brownell <david-b@...bell.net> wrote:
> 
> > From: David Brownell <dbrownell@...rs.sourceforge.net>
> > 
> > Minor cleanup to the regulator set_mode sysfs support:
> > switch to sysfs_streq() in set_mode(), which is also
> > a code shrink.  Use the same strings that get_mode()
> > uses, shrinking data too.
> > 
> > Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
> > ---
> >  drivers/regulator/virtual.c |    8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > --- a/drivers/regulator/virtual.c
> > +++ b/drivers/regulator/virtual.c
> > @@ -226,13 +226,13 @@ static ssize_t set_mode(struct device *d
> >  	unsigned int mode;
> >  	int ret;
> >  
> > -	if (strncmp(buf, "fast", strlen("fast")) == 0)
> > +	if (sysfs_streq(buf, "fast\n") == 0)
> >  		mode = REGULATOR_MODE_FAST;
> > -	else if (strncmp(buf, "normal", strlen("normal")) == 0)
> > +	else if (sysfs_streq(buf, "normal\n") == 0)
> >  		mode = REGULATOR_MODE_NORMAL;
> > -	else if (strncmp(buf, "idle", strlen("idle")) == 0)
> > +	else if (sysfs_streq(buf, "idle\n") == 0)
> >  		mode = REGULATOR_MODE_IDLE;
> > -	else if (strncmp(buf, "standby", strlen("standby")) == 0)
> > +	else if (sysfs_streq(buf, "standby\n") == 0)
> >  		mode = REGULATOR_MODE_STANDBY;
> 
> we don't need the \n's, do we?

oh, it's for the string sharing.  Sneaky.

I wonder how many people will try to fix that up for us?

--- a/drivers/regulator/virtual.c~regulator-minor-cleanup-of-virtual-consumer-fix
+++ a/drivers/regulator/virtual.c
@@ -226,6 +226,10 @@ static ssize_t set_mode(struct device *d
 	unsigned int mode;
 	int ret;
 
+	/*
+	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
+	 * will be shared with show_mode(), above.
+	 */
 	if (sysfs_streq(buf, "fast\n") == 0)
 		mode = REGULATOR_MODE_FAST;
 	else if (sysfs_streq(buf, "normal\n") == 0)
_

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