Re: [PATCH] EHCI interrupt transactions failing during CPU frequency changes

On Tue, 20 Feb 2007 [email protected] wrote:

...
> This patch turns off periodic list processing in the EHCI controller for
> the duration of processor frequency changes.
> 
> Signed-off-by: Stuart Hayes <[email protected]>

> +#define __type_entry(ptr,type,member) ((type *)((char *)(ptr)-offsetof(type,member)))
> +
> +static int ehci_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
> +				 void *data)
> +{
> +	struct ehci_hcd *ehci = __type_entry(nb, struct ehci_hcd, 
> +					     cpufreq_transition);

There already is a standard container_of() macro to do this.

Alan Stern


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