Re: [PATCH 04/30] staging/vme: allow non-dynamic allocation of bus numbers

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 04/11/10 03:40, Emilio G. Cota wrote:
> On Wed, Oct 27, 2010 at 11:13:27 -0400, Emilio G. Cota wrote:
>> On Wed, Oct 27, 2010 at 10:41:18 +0100, Martyn Welch wrote:
>>> On 26/10/10 02:10, Emilio G. Cota wrote:
>>>> From: Emilio G. Cota <cota@xxxxxxxxx>
>>>>
>>>> In a configuration with several bridges, each bridge is
>>>> assigned a certain bus number depending on the order in which
>>>> vme_register_bridge is called. This can complicate multi-bridge
>>>> installations because the eventual bus numbers will depend
>>>> on the order the bridges were loaded.
>>>>
>>>> The appended allows bridges to register with a bus number of
>>>> their choice, while keeping the previous 'first come, first
>>>> served' behaviour as the default.
>>>>
>>>
>>> I can't see where this is being used.
>>
>> Each driver's .probe is fed with bus_number and slot_number.
>> Normally the driver will check that pair against what it received
>> through modparams and act accordingly.
>>
>> For this to be reliable bus numbering should be consistent on
>> a given system, i.e. it should be possible to always allocate
>> the same bus number to a given bus. Otherwise, depending on
>> which bridge is installed first, we'd get different bus numbers
>> assigned.
>>
>> Does that make it clearer now?
>>
>>> I assume this is a part of future changes you wish to make?
>>
>> AFAICT it affects the current model.
> 
> Martyn,
> 
> Have you had time to re-check this one?
> 

I'm afraid I haven't - I'm rather tied up at the moment. I'll try and
set aside some time next week to look at the remaining patches you sent.

Martyn


-- 
Martyn Welch (Principal Software Engineer)   |   Registered in England and
GE Intelligent Platforms                     |   Wales (3828642) at 100
T +44(0)127322748                            |   Barbirolli Square,
Manchester,
E martyn.welch@xxxxxx                        |   M2 3AB  VAT:GB 927559189
_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/devel


[Index of Archives]     [Linux Driver Backports]     [DMA Engine]     [Linux GPIO]     [Linux SPI]     [Video for Linux]     [Linux USB Devel]     [Linux Coverity]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux