Re: [PATCH 2/3] pci: Kill rescan under /sys/.../pci/devices/...

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On Fri, May 13, 2011 at 03:05:08AM -0600, Alex Chiang wrote:
> * Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>:
> > On Mon, 02 May 2011 16:14:50 -0700
> > Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> > 
> > > 
> > > That is not right. the device is already there, there is no reason to rescan it.
> > > We can not get increase resource for them.
> > > 
> > > Now We already have rescan for pci_bus.
> > > 
> > > So remove rescan for all pci devices. less confusing
> > > 
> > > Finally We remove devices, and rescan bus that there were on before.
> > > 
> > > Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> > 
> > I'm reluctant to break an existing interface like this, even though
> > it's only in the "testing" section of the ABI.
> > 
> > Alex, any comments?
> 
> Oof, yeah. :-/
> 
> I just scanned through the patch series and agree that it makes
> more sense to put 'rescan' under the bus, and not on individual
> devices.
> 
> That said, I'm fairly certain that there are existing tools out
> there that are depending on this interface, which has been around
> for a while.
> 
> I think standard ABI deprecation practices should apply here.
> 
> Greg, thoughts?

Ooh, I missed the fact that this series removed a sysfs file, you are
right, we can't do that.

So no, don't delete this file, please fix any tools that might happen to
be using it, and then, in a year or so, we can revisit this to see if it
makes sense to remove it.

thanks,

greg k-h
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