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

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Date:	Tue, 7 Jun 2011 23:24:53 +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 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.

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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