Re: phyX enumeration conflict

[Ben Greear <greearb@candelatech.com>]

On 10/10/2010 01:16 AM, Johannes Berg wrote:
> On Sun, 2010-10-10 at 10:09 +0200, Johannes Berg wrote:
>
>> The commit failed to take into account that allocated wireless devices
>> (wiphys) are not added into the device list upon allocation, but only
>> when they are registered. Therefore, it opened up a race between
>> allocating and registering a name, so that if two processes allocate and
>> register concurrently ("alloc, alloc, register, register" rather than
>> "alloc, register, alloc, register") the code will attempt to use the
>> same name twice.
>
> And as for the actual feature, as far as I'm concerned the discussion
> ends here because we otherwise need to use something as complex as idr.
> A udev rule can't break the kernel and works just as well, even if
> you'll have to use a different namespace, i.e. not "phy%d" -- use say
> "wiphy%d" instead.

Sorry about that.  If anyone has any example udev magic to do this sort
of thing, I'd like to try that out.

Thanks,
Ben

>
> johannes


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com