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

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Date:	Mon, 6 Jun 2011 21:18:17 +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 Mon 06 Jun 2011 at 19:47:36 Rafael J. Wysocki wrote:
> Hi,
> 
> On Sunday, June 05, 2011, Janusz Krzysztofik wrote:
> > In its current form, pm_runtime_clk_notify() iterates through sub-
> > strings of pm_clk_notifier_block.con_ids[0] rather than consecutive
> > pm_clk_notifier_block.con_ids[] elements. As a noticeable result,
> > McBSP1 port no longer worked for me on updated
> > arch/arm/mach-omap1/pm_bus.c (commit
> > 600b776eb39a13a28b090ba9efceb0c69d4508aa, "OMAP1 / PM: Use generic
> > clock manipulation routines for runtime PM"), not being able to
> > activate "fck" when required.
> > 
> > Tested on Amstrad Delta.
> > 
> > Signed-off-by: Janusz Krzysztofik <jkrzyszt@....icnet.pl>
> > ---
> > 
> >  drivers/base/power/clock_ops.c |    6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > --- git/drivers/base/power/clock_ops.c.orig	2011-05-30
> > 22:16:35.000000000 +0200 +++
> > git/drivers/base/power/clock_ops.c	2011-06-05 15:19:55.000000000
> > +0200 @@ -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[0]; *con_id; con_id++)
> > +				pm_runtime_clk_add(dev, *con_id);
> > 
> >  		} else {
> >  		
> >  			pm_runtime_clk_add(dev, NULL);
> >  		
> >  		}
> 
> First off, sorry for the breakage.  Second, while the patch is
> correct in the part is covered, it is incomplete (it also should
> cover the !CONFIG_PM_RUNTIME case.  So, I think the appended patch
> would be better.

That's right, please take it over.

Thanks,
Janusz


> Thanks,
> Rafael
> 
> ---
>  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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