linux-kernel - Re: [PATCH 3.0-rc1] PM / runtime: fix broken iteration over clock ids

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Date:	Wed, 8 Jun 2011 00:27:13 +0200
From:	Janusz Krzysztofik <jkrzyszt@....icnet.pl>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...ts.linux-foundation.org, Pavel Machek <pavel@....cz>,
	Len Brown <len.brown@...el.com>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	linux-kernel@...r.kernel.org,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 3.0-rc1] PM / runtime: fix broken iteration over clock ids

On Tue 07 Jun 2011 at 23:24:53 Janusz Krzysztofik wrote:
> On Tue 07 Jun 2011 at 21:29:25 Rafael J. Wysocki wrote:
> > OK, below is an "official" version.  Can you please double check if
> > it fixes the problem for you?
> 
> Hi,
> I've tested it successfully, but only the CONFIG_PM_RUNTIME=y case,
> not the other because of still another McBSP issue, I believe,
> described elswhere.

With a patch from Kevin, I was able to test the !PM_RUNTIME case 
successfully as well.

Thanks,
Janusz

> Thanks,
> Janusz
> 
> > Rafael
> > 
> > ---
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > Subject: PM / Runtime: Fix loops in pm_runtime_clk_notify()
> > 
> > The loops over connection ID strings in pm_runtime_clk_notify()
> > should actually iterate over the strings and not over the elements
> > of the first of them, so make those loops behave as appropriate.
> > 
> > This fixes a regression introduced by commit 600b776eb39a13a28b090
> > (OMAP1 / PM: Use generic clock manipulation routines for runtime
> > PM).
> > 
> > Reported-by: Janusz Krzysztofik <jkrzyszt@....icnet.pl>
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > ---
> > 
> >  drivers/base/power/clock_ops.c |   16 ++++++++--------
> >  1 file changed, 8 insertions(+), 8 deletions(-)
> > 
> > Index: linux-2.6/drivers/base/power/clock_ops.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/base/power/clock_ops.c
> > +++ linux-2.6/drivers/base/power/clock_ops.c
> > @@ -291,7 +291,7 @@ static int pm_runtime_clk_notify(struct
> > 
> >  {
> >  
> >  	struct pm_clk_notifier_block *clknb;
> >  	struct device *dev = data;
> > 
> > -	char *con_id;
> > +	char **con_id;
> > 
> >  	int error;
> >  	
> >  	dev_dbg(dev, "%s() %ld\n", __func__, action);
> > 
> > @@ -309,8 +309,8 @@ static int pm_runtime_clk_notify(struct
> > 
> >  		dev->pwr_domain = clknb->pwr_domain;
> >  		if (clknb->con_ids[0]) {
> > 
> > -			for (con_id = clknb->con_ids[0]; *con_id; con_id++)
> > -				pm_runtime_clk_add(dev, con_id);
> > +			for (con_id = clknb->con_ids; *con_id; con_id++)
> > +				pm_runtime_clk_add(dev, *con_id);
> > 
> >  		} else {
> >  		
> >  			pm_runtime_clk_add(dev, NULL);
> >  		
> >  		}
> > 
> > @@ -380,7 +380,7 @@ static int pm_runtime_clk_notify(struct
> > 
> >  {
> >  
> >  	struct pm_clk_notifier_block *clknb;
> >  	struct device *dev = data;
> > 
> > -	char *con_id;
> > +	char **con_id;
> > 
> >  	dev_dbg(dev, "%s() %ld\n", __func__, action);
> > 
> > @@ -389,16 +389,16 @@ static int pm_runtime_clk_notify(struct
> > 
> >  	switch (action) {
> >  	
> >  	case BUS_NOTIFY_ADD_DEVICE:
> >  		if (clknb->con_ids[0]) {
> > 
> > -			for (con_id = clknb->con_ids[0]; *con_id; con_id++)
> > -				enable_clock(dev, con_id);
> > +			for (con_id = clknb->con_ids; *con_id; con_id++)
> > +				enable_clock(dev, *con_id);
> > 
> >  		} else {
> >  		
> >  			enable_clock(dev, NULL);
> >  		
> >  		}
> >  		break;
> >  	
> >  	case BUS_NOTIFY_DEL_DEVICE:
> >  		if (clknb->con_ids[0]) {
> > 
> > -			for (con_id = clknb->con_ids[0]; *con_id; con_id++)
> > -				disable_clock(dev, con_id);
> > +			for (con_id = clknb->con_ids; *con_id; con_id++)
> > +				disable_clock(dev, *con_id);
> > 
> >  		} else {
> >  		
> >  			disable_clock(dev, NULL);
> >  		
> >  		}
> > 
> > --
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