linux-kernel - Re: [PATCH 2/3] power: clock_ops.c: check return of clk_enable() in pm_clk

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Date:	Mon, 13 Jan 2014 20:55:58 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:	linux-kernel@...ts.codethink.co.uk, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] power: clock_ops.c: check return of clk_enable() in pm_clk_resume()

On Saturday, January 11, 2014 01:05:39 PM Ben Dooks wrote:
> The clk_enable() call in the pm_clk_resume() call returns an error
> that is not being checked. If clk_enable() fails then we should
> not set the state of the clock to PCE_STATUS_ENABLED.
> 
> Note, the issue of warning the user if this fails has not been
> addressed in this patch as this is not the only place the driver
> calls clk_enable().
> 
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-pm@...r.kernel.org
> Cc: linux-sh@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
> Reviewed-by: Ian Molton <ian.molton@...ethink.co.uk>
> ---
>  drivers/base/power/clock_ops.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
> index b9dd8fa..9bb95ab 100644
> --- a/drivers/base/power/clock_ops.c
> +++ b/drivers/base/power/clock_ops.c
> @@ -252,6 +252,7 @@ int pm_clk_resume(struct device *dev)
>  	struct pm_subsys_data *psd = dev_to_psd(dev);
>  	struct pm_clock_entry *ce;
>  	unsigned long flags;
> +	int ret;
>  
>  	dev_dbg(dev, "%s()\n", __func__);
>  
> @@ -262,8 +263,9 @@ int pm_clk_resume(struct device *dev)
>  
>  	list_for_each_entry(ce, &psd->clock_list, node) {
>  		if (ce->status < PCE_STATUS_ERROR) {
> -			clk_enable(ce->clk);
> -			ce->status = PCE_STATUS_ENABLED;
> +			ret = clk_enable(ce->clk);
> +			if (ret == 0)

Can you please use if (!ret) here?

And analogously in patch [3/3]?

> +				ce->status = PCE_STATUS_ENABLED;
>  		}
>  	}
>  
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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