svn commit: r187978 - user/thompsa/usb/sys/dev/usb2/ethernet
M. Warner Losh
imp at bsdimp.com
Sun Feb 1 20:55:00 PST 2009
In message: <20090202044416.GC43513 at michelle.cdnetworks.co.kr>
Pyun YongHyeon <pyunyh at gmail.com> writes:
: On Sun, Feb 01, 2009 at 08:36:18PM -0700, M. Warner Losh wrote:
: > In message: <20090201213749.GJ32503 at citylink.fud.org.nz>
: > Andrew Thompson <thompsa at FreeBSD.org> writes:
: > : On Sun, Feb 01, 2009 at 02:28:08PM -0700, M. Warner Losh wrote:
: > : > In message: <200902010650.n116obU1045871 at svn.freebsd.org>
: > : > Andrew Thompson <thompsa at FreeBSD.org> writes:
: > : > : + locked = mtx_owned(&sc->sc_mtx);
: > : > : + if (!locked)
: > : > : + AUE_LOCK(sc);
: > : >
: > : > You do know this is racy, right?
: > :
: > : Yea... It only get called unlocked during mii probe+attach so its fine.
: > : I havnt actaully checked if its ok to hold a mutex during
: > : mii_phy_probe() which would make this go away.
: > You hold GIANT when probe+attach, which means I think you can't
: AFAIK this is not true on USB2 and I think this is reason why
: it have to lock/unlock dance in probe/attach.
It is a newbus requirement that all probe/attach routines have to be
called with GIANT held.
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