On Wed, Apr 28, 2021 at 8:57 AM Oliver Neukum <oneukum@xxxxxxxx> wrote: > > 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? In principle, in the wake of Thunderbolt every PCI driver handling PCIe devices needs to be able to deal with a device that's gone away without notice, because in principle any PCIe device can be included into a Thunderbolt docking station which may go away as a whole without notice.
