On Sun, 7 Oct 2018, Klaus Kusche wrote: > Hello, > > On 03/10/2018 16:02, Alan Stern wrote: > > Well, what happens if you add only US_FL_BROKEN_FUA without > > US_FL_IGNORE_UAS? Does it work? > > Tried all four combinations with gentoo 4.18.12. > Just US_FL_IGNORE_UAS fails with the error message in the original bug report. > > The other three combinations (both flags removed, both flags set, > just US_FL_BROKEN_FUA set) work, at least for a quick test with ext4. > > My guess: > Without US_FL_IGNORE_UAS (i.e. when using UAS), > the FUA command triggering the error is not used at all, > so US_FL_BROKEN_FUA doesn't make a difference.
That may or may not be correct. A usbmon trace would tell us. > > For that matter, does your kernel config include the uas driver? > > Yes, it does. > > > I think we have to wait for sel...@redhat.com . > He could tell why he added US_FL_IGNORE_UAS, > if it's really needed, and why it was not included in mainline. Good point. > However, as US_FL_BROKEN_FUA is set for JMS567, > it is perhaps a good idea to set it for JMS566, too, > independent of US_FL_IGNORE_UAS (which is not set for JMS567). Agreed. Especially since we know that FUA does trigger a problem when UAS isn't used. Alan Stern
