linux-kernel - Re: [PATCH 1/1] avr32: handle NULL as a valid clock object

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Date:	Fri, 24 Jul 2015 13:02:53 +0200
From:	Hans-Christian Egtvedt <egtvedt@...fundet.no>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Haavard Skinnemoen <hskinnemoen@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] avr32: handle NULL as a valid clock object

Around Fri 24 Jul 2015 13:49:48 +0300 or thereabout, Andy Shevchenko wrote:
> Since NULL is used as valid clock object on optional clocks we have to handle
> this case in avr32 implementation as well.
> 
> Fixes: e1824dfe0d8e (net: macb: Adjust tx_clk when link speed changes)
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Acked-by: Hans-Christian Egtvedt <egtvedt@...fundet.no>

Although, IMO this should have been in the common part of the clk framework.

I'll add it into my tree and ask Linus to pull it as a fix for current RC.

> ---
>  arch/avr32/mach-at32ap/clock.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c
> index 23b1a97..52c179b 100644
> --- a/arch/avr32/mach-at32ap/clock.c
> +++ b/arch/avr32/mach-at32ap/clock.c
> @@ -80,6 +80,9 @@ int clk_enable(struct clk *clk)
>  {
>  	unsigned long flags;
>  
> +	if (!clk)
> +		return 0;
> +
>  	spin_lock_irqsave(&clk_lock, flags);
>  	__clk_enable(clk);
>  	spin_unlock_irqrestore(&clk_lock, flags);
> @@ -106,6 +109,9 @@ void clk_disable(struct clk *clk)
>  {
>  	unsigned long flags;
>  
> +	if (IS_ERR_OR_NULL(clk))
> +		return;
> +
>  	spin_lock_irqsave(&clk_lock, flags);
>  	__clk_disable(clk);
>  	spin_unlock_irqrestore(&clk_lock, flags);
> @@ -117,6 +123,9 @@ unsigned long clk_get_rate(struct clk *clk)
>  	unsigned long flags;
>  	unsigned long rate;
>  
> +	if (!clk)
> +		return 0;
> +
>  	spin_lock_irqsave(&clk_lock, flags);
>  	rate = clk->get_rate(clk);
>  	spin_unlock_irqrestore(&clk_lock, flags);
> @@ -129,6 +138,9 @@ long clk_round_rate(struct clk *clk, unsigned long rate)
>  {
>  	unsigned long flags, actual_rate;
>  
> +	if (!clk)
> +		return 0;
> +
>  	if (!clk->set_rate)
>  		return -ENOSYS;
>  
> @@ -145,6 +157,9 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
>  	unsigned long flags;
>  	long ret;
>  
> +	if (!clk)
> +		return 0;
> +
>  	if (!clk->set_rate)
>  		return -ENOSYS;
>  
> @@ -161,6 +176,9 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
>  	unsigned long flags;
>  	int ret;
>  
> +	if (!clk)
> +		return 0;
> +
>  	if (!clk->set_parent)
>  		return -ENOSYS;
>  
> @@ -174,7 +192,7 @@ EXPORT_SYMBOL(clk_set_parent);
>  
>  struct clk *clk_get_parent(struct clk *clk)
>  {
> -	return clk->parent;
> +	return !clk ? NULL : clk->parent;
>  }
>  EXPORT_SYMBOL(clk_get_parent);
>  
-- 
mvh
Hans-Christian Egtvedt
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