Re: [PATCH v2 2/2] pci: Support "removable" attribute for PCI devices

Oliver Neukum
2021-04-28T06:57:02Z

Am Dienstag, den 27.04.2021, 12:59 +0000 schrieb David Laight:
> From: Oliver Neukum
> > Sent: 27 April 2021 13:00

> > that is true for those options, but not for the style
> > of PCI hotplug which requires you to push a button and wait
> > for the blinking light.
>
> True, I remember some of those PCI hotplug chassis from 25 years ago.
> ISTR we did get the removal events working (SVR4/Unixware) but I
> don't remember the relevant chassis ever being sold.
> In spite of the marketing hype I suspect it was only ever possible
> to remove a completely working board and replace it with an
> exactly equivalent one.
>
> In any case those chassis are not 'surprise removal'.
>
> More modern drivers are less likely to crash (and burn?) when
> a PCI read returns ~0u.
> But I suspect an awful lot really don't handle surprise removal
> very well at all.

So you are saying that these systems are so rare that it should be
handled as special cases if at all?

Regards
Oliver