Re: Please revert 5adc55da4a7758021bcc374904b0f8b076508a11 (PCI_MULTITHREAD_PROBE)

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

 

On Wed, 9 May 2007, Cornelia Huck wrote:


On Wed, 9 May 2007 10:53:52 -0700 (PDT),
[email protected] wrote:


if you want the registration to use hotplug and be async then do do the
registration during step 2 and make step 4 be a noop, in fact some drivers
may do all their work in step 2, while others (everything currently) will
do all their work during step 1


The added benefit of setup() I was thinking of was being able to
enable/disable devices later on (where enable entails the "heavy
lifting").

Say you have a range of devices you only use seldomly for some special
purpose. They may take a long time to get up and use a lot of resources
when they're on. You don't want to slow the boot process down for them,
so they start disabled with just very basic setup (the fast stuff)
done. (It is also useful if you want some manual configuration between
the fast stuff and the heavy lifting.) When you need them, you spin
them up (may take some time) and then use them. Afterwards, you could
spin them down again. (This is what the ccw/ccwgroup/ap bus online
attribute does today.)
this sounds like something that you want to load the driver module for when you want to use it and unload the driver module when you are done.
if you want to make a seperate enable/disable function I think it would probably be more appropriate to use the power management functions. 

David Lang
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/
[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux