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Don't call usl_sync_check_sig from an interrupt context. Call it only if waitok.

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Stack trace:	mutex_vector_enter <- usl_sync_check_sig <- usl_detachproc <-
		wsdisplay_switch <- wskbd_translate <- wskbd_input <-
		pckbd_input <- pckbcintr <- intr_biglock_wrapper <-
		Xintr_ioapic_edge1
Reported by Anon Ymous
This commit is contained in:
christos 2009-10-04 22:24:15 +00:00
parent 2641b26df3
commit 28b2719313
1 changed files with 6 additions and 4 deletions
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10
sys/dev/wscons/wsdisplay_compat_usl.c
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@ -1,4 +1,4 @@
/* $NetBSD: wsdisplay_compat_usl.c,v 1.45 2008/04/24 15:35:28 ad Exp $ */
/* $NetBSD: wsdisplay_compat_usl.c,v 1.46 2009/10/04 22:24:15 christos Exp $ */
/*
* Copyright (c) 1998
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: wsdisplay_compat_usl.c,v 1.45 2008/04/24 15:35:28 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: wsdisplay_compat_usl.c,v 1.46 2009/10/04 22:24:15 christos Exp $");
#include "opt_compat_freebsd.h"
#include "opt_compat_netbsd.h"
@ -191,8 +191,10 @@ usl_detachproc(void *cookie, int waitok,
*/
sd->s_callback = callback;
sd->s_cbarg = cbarg;
if (!usl_sync_check_sig(sd, sd->s_relsig, SF_DETACHPENDING))
return (0);
if (waitok) {
if (!usl_sync_check_sig(sd, sd->s_relsig, SF_DETACHPENDING))
return (0);
}
callout_schedule(&sd->s_detach_ch, wscompat_usl_synctimeout * hz);
return (EAGAIN);