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Re: [RFD] Functional dependencies between devices

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On 30 October 2015 at 23:52, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Tue, Oct 27, 2015 at 04:24:14PM +0100, Rafael J. Wysocki wrote:
>> My idea is to represent a supplier-consumer dependency between devices (or
>> more precisely between device+driver combos) as a "link" object containing
>> pointers to the devices in question, a list node for each of them and some
>> additional information related to the management of those objects, ie.
>> something like:
>>
>> struct device_link {
>>       struct device *supplier;
>>       struct list_head supplier_node;
>>       struct device *consumer;
>>       struct list_head consumer_node;
>>       <flags, status etc>
>> };
>>
>> In general, there will be two lists of those things per device, one list
>> of links to consumers and one list of links to suppliers.
>>
>> In that picture, links will be created by calling, say:
>>
>> int device_add_link(struct device *me, struct device *my_supplier, unsigned int flags);
>
> At first glance, I like this, nice.  Now to see how well it can be
> implemented :)

Hi Greg,

what's your opinion on using this to order device probes so we don't
try to probe a device that we know it has unfulfilled dependencies?

Regards,

Tomeu
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Re: [RFD] Functional dependencies between devices Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2016-01-07 16:00 +0100
  Re: [RFD] Functional dependencies between devices Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-01-07 22:30 +0100
    Re: [RFD] Functional dependencies between devices Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2016-01-08 08:30 +0100
      Re: [RFD] Functional dependencies between devices Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-01-08 16:20 +0100

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