svn commit: r225458 - in stable/8/sys: dev/usb dev/usb/quirk dev/usb/storage sys

Hans Petter Selasky hselasky at
Sat Sep 10 11:23:20 UTC 2011

On Saturday 10 September 2011 12:54:08 Robert Watson wrote:
> On Fri, 9 Sep 2011, Hans Petter Selasky wrote:
> > Log:
> >  MFC r225350 and r225400:
> >  
> >  This patch adds automatic detection of USB mass storage devices
> >  which does not support the no synchronize cache SCSI command.
> >  
> >  The __FreeBSD_version version macro has been bumped and
> >  external kernel modules needs to be recompiled after
> >  this patch.
> >  
> >  PR:	usb/160299
> For most other classes of hardware device driver framework KPIs --
> especially things like PCI bus attachment, busdma, CAM, ifnet, and GEOM
> frameworks, our MFC rules would strictly disallow this sort of change, on
> the grounds that it is our KBI policy that we not break common classes of
> third-party device drivers (i.e., require them to be recompiled).  My
> suspicion is that we should be applying the same rules to the USB
> framework -- however, I don't know if we have any third-party USB device
> drivers?
> (If we do, then this change should not have been MFC'd.)

Hi Robert,

I understand your point. The change is not breaking any KPIs towards 
userspace. The structure in question is only used within the kernel and kernel 


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