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ehci_free_itd: use LIST_INSERT_HEAD rather than

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LIST_INSERT_AFTER(LIST_FIRST(..), ..) when returning itds to the freelist
to prevent a crash when the freelist is empty. Reviewed by Jeremy Morse.
This commit is contained in:
jmcneill 2008-10-06 02:21:50 +00:00
parent aef4db128d
commit 04fec95922
1 changed files with 3 additions and 3 deletions
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6
sys/dev/usb/ehci.c
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@ -1,4 +1,4 @@
/* $NetBSD: ehci.c,v 1.149 2008/10/05 21:31:39 jmcneill Exp $ */
/* $NetBSD: ehci.c,v 1.150 2008/10/06 02:21:50 jmcneill Exp $ */
/*
* Copyright (c) 2004-2008 The NetBSD Foundation, Inc.
@ -52,7 +52,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ehci.c,v 1.149 2008/10/05 21:31:39 jmcneill Exp $");
__KERNEL_RCSID(0, "$NetBSD: ehci.c,v 1.150 2008/10/06 02:21:50 jmcneill Exp $");
#include "ohci.h"
#include "uhci.h"
@ -2828,7 +2828,7 @@ ehci_free_itd(ehci_softc_t *sc, ehci_soft_itd_t *itd)
int s;
s = splusb();
LIST_INSERT_AFTER(LIST_FIRST(&sc->sc_freeitds), itd, u.free_list);
LIST_INSERT_HEAD(&sc->sc_freeitds, itd, u.free_list);
splx(s);
}