On Tue, 27 Mar 2007 13:15:14 -0400 (EDT), Alan Stern <[EMAIL PROTECTED]> wrote:
> > Suspend to disk still causes "virtual replugging" and I think that > > controller is reset and will unplug/replug devices anyway > > Resolving this problem is very difficult. Maybe it possible to check on > > unplugging event that this caused by suspend if the same device is > > replugged then don't remove/reinstall driver, but this is very difficult to > > implement properly, > > Maybe just refuse to suspend if some valuable device is connected (sorry if > > it is done this way already) > > Long ago I posted a patch that would take care of all this. Not just for > UHCI, but for any USB controller. Maybe I should dig it out, update it, > and submit it. Alan, BTW, look at this please: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=233697 > From David Zeuthen > If I suspend my box, then on the resume path I see all my USB devices being > removed and then added back. This is a problem with storage devices connected > via USB. ..... > The kernel not send an "remove" event if it's going to send an "add" right > after. Instead it should enumerate the bus on resume and only send the events > that represents how to get from the previous device tree to the current one. > From Pete Zaitcev > What does happen if a user suspends, unplugs a USB key, modifies its contents, > plugs it back, and resumes? In such a case, there would be no change between > the state of USB bus between the before-suspend state and after-resume state. > From David Zeuthen > In that case the user would see data corruption - just as if he mounts a piece > of removable media in a USB card reader; yanks out the card and modifies it > elsewhere, and then puts it back in. > I my opinion we can't really defend ourselves against such users... We can of > course add checks in the file system drivers in the resume hooks to validate > the > super block and mount read-only if something change. The GNOME hath spoken? -- Pete ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
