scsi-da does not work with invariants

[Aniruddha Bohra]

Hello
	I tried compiling the 4-STABLE branch with INVARIANTS and 
INVARIANT_SUPPORT.

	I got a panic on boot - The problem is that daregister
calls malloc with M_WAITOK in interrupt context and INVARIANTS
panics the kernel.

  $FreeBSD: src/sys/cam/scsi/scsi_da.c,v 1.42.2.40 2003/08/24 03:26:38 
ken Exp $

	The problem is in the following lines :

	softc->sysctl_tree = SYSCTL_ADD_NODE(&softc->sysctl_ctx,
	SYSCTL_STATIC_CHILDREN(_kern_cam_da), OID_AUTO, tmpstr2,
		CTLFLAG_RD, 0, tmpstr);

	
SYSCTL_ADD_NODE is a macro defined in sys/sysctl.h as :
#define SYSCTL_ADD_NODE(ctx, parent,nbr,name,access,handler, descr)\
	sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_NODE|access,\
	0, 0, handler, "N", descr);

And sysctl_add_oid is defined in kern/kern_sysctl.c and has the following :

oidp = malloc(sizeof(struct sysctl_oid), M_SYSCTLOID, M_WAITOK);

which has a WAITOK malloc.

	
	Unfortunately, I cannot get a trace till tomorrow. Right now
the machine runs fine without INVARIANTS and INVARIANT_SUPPORT.


	Thanks

Aniruddha