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Add a DIAGNOSTIC check. From FreeBSD.

This commit is contained in:
augustss 2002-01-03 22:20:45 +00:00
parent b3b35b86aa
commit f854b2521f
1 changed files with 9 additions and 2 deletions
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11
sys/dev/usb/usb.c
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@ -1,4 +1,4 @@
/* $NetBSD: usb.c,v 1.64 2002/01/02 22:44:44 augustss Exp $ */
/* $NetBSD: usb.c,v 1.65 2002/01/03 22:20:45 augustss Exp $ */
/*
* Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
@ -44,7 +44,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: usb.c,v 1.64 2002/01/02 22:44:44 augustss Exp $");
__KERNEL_RCSID(0, "$NetBSD: usb.c,v 1.65 2002/01/03 22:20:45 augustss Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -616,6 +616,13 @@ usb_get_next_event(struct usb_event *ue)
if (usb_nevents <= 0)
return (0);
ueq = SIMPLEQ_FIRST(&usb_events);
#ifdef DIAGNOSTIC
if (ueq == NULL) {
printf("usb: usb_nevents got out of sync! %d\n", usb_nevents);
usb_nevents = 0;
return (0);
}
#endif
*ue = ueq->ue;
SIMPLEQ_REMOVE_HEAD(&usb_events, ueq, next);
free(ueq, M_USBDEV);