destroy_dev_drain stuck (devscd) after kldload, ls -l cloned device, kldunload (trying to fix kqemu...)

[Juergen Lock]

On Sat, Apr 19, 2008 at 06:57:36AM +0300, Kostik Belousov wrote:
> On Fri, Apr 18, 2008 at 09:51:50PM +0200, Juergen Lock wrote:
> > Using this... after what has been done to /sys/netsmb/smb_dev.c:
> > 
> > Index: Makefile
> > ===================================================================
> > RCS file: /home/pcvs/ports/emulators/kqemu-kmod/Makefile,v
> > retrieving revision 1.21
> > diff -u -p -r1.21 Makefile
> > --- Makefile	26 Jul 2007 21:46:30 -0000	1.21
> > +++ Makefile	18 Apr 2008 18:58:29 -0000
> > @@ -7,7 +7,7 @@
> >  
> >  PORTNAME=	kqemu
> >  PORTVERSION=	1.3.0.p11
> > -PORTREVISION=	2
> > +PORTREVISION=	3
> >  CATEGORIES=	emulators kld
> >  MASTER_SITES=	http://fabrice.bellard.free.fr/qemu/ \
> >  		http://qemu.org/ \
> > @@ -57,17 +57,6 @@ IGNORE=		kqemu requires kernel source to
> >  CFLAGS+=	-DKSE
> >  .endif
> >  
> > -# XXX the following is wrong if you run a custom SMP kernel on a
> > -# singleprocessor machine (but it probably doesn't really matter)
> > -KERNCONF!=	${UNAME} -v | ${SED} 's-.*/--' | ${TR} -d ' '
> > -NCPU!=		${SYSCTL} -n hw.ncpu 2>/dev/null
> > -# we know 7.x GENERIC has SMP
> > -.if ${KERNCONF} == "GENERIC" && ${OSVERSION} >= 700000
> > -CFLAGS+=	-DSMP
> > -.elif ${NCPU} > 1
> > -CFLAGS+=	-DSMP
> > -.endif
> > -
> >  post-extract:
> >  .if ${OSVERSION} >= 700024 && !defined(NOKSE)
> >  	@${ECHO_MSG} "Compiling with -DKSE."
> > Index: files/patch-kqemu-freebsd.c
> > ===================================================================
> > RCS file: /home/pcvs/ports/emulators/kqemu-kmod/files/patch-kqemu-freebsd.c,v
> > retrieving revision 1.6
> > diff -u -p -r1.6 patch-kqemu-freebsd.c
> > --- files/patch-kqemu-freebsd.c	21 Jul 2007 19:38:16 -0000	1.6
> > +++ files/patch-kqemu-freebsd.c	18 Apr 2008 18:37:00 -0000
> > @@ -17,13 +17,30 @@ Index: kqemu-freebsd.c
> >       return SIGPENDING(curthread);
> >   }
> >   #endif
> > -@@ -320,6 +328,9 @@
> > +@@ -320,8 +320,15 @@
> >   #if __FreeBSD_version >= 500000
> >       dev->si_drv1 = NULL;
> >       TAILQ_REMOVE(&kqemuhead, ks, kqemu_ent);
> > ++#if __FreeBSD_version >= 700051
> > ++    destroy_dev_sched(dev);
> > ++#else
> >  +#if __FreeBSD_version >= 700024
> >  +    dev_relthread(dev); 
> >  +#endif
> >       destroy_dev(dev);
> >   #endif
> > ++#endif
> >       free(ks, M_KQEMU);
> > +     --kqemu_ref_count;
> > + }
> > +@@ -500,6 +507,10 @@
> > + 	while ((ks = TAILQ_FIRST(&kqemuhead)) != NULL) {
> > + 	    kqemu_destroy(ks);
> > + 	}
> > ++#if __FreeBSD_version >= 700051
> > ++	drain_dev_clone_events();
> > ++	/* destroy_dev_drain(&kqemu_cdevsw); */
> > ++#endif
> > + 	clone_cleanup(&kqemuclones);
> > + #endif
> > +         kqemu_global_delete(kqemu_gs);
> 
> The destroy_dev_drain() function waits for the cdevs having the
> kqemu_cdevsw cdevsw to be destroyed. I did not looked into the actual
> kqemu sources, but assumed that kqemuclones have kqemu_cdevsw as
> cdevsw. If this is the case, you shall call clone_cleanup() before
> destroy_dev_drain().

Ah, that seems to work indeed.

 Thanx!
	Juergen