Date: Mon, 16 Jul 2001 00:13:14 +0900 (JST) From: Hajimu UMEMOTO <ume@mahoroba.org> To: net@FreeBSD.org, current@FreeBSD.org Subject: Use of M_WAITOK in if_addmulti(). Message-ID: <20010716.001314.59549708.ume@mahoroba.org> In-Reply-To: <20010715120317.A99869@fump.kawo2.rwth-aachen.de> References: <20010715120317.A99869@fump.kawo2.rwth-aachen.de>
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Hi,
Current if_addmulti() calls MALLOC() with M_WAITOK. However,
if_addmulti() can be called from in[6]_addmulti() with splnet(). It
may lead kernel panic. So, I wish to change to use M_NOWAIT.
Any comment?
Index: sys/net/if.c
diff -u sys/net/if.c.orig sys/net/if.c
--- sys/net/if.c.orig Wed Jul 4 20:28:47 2001
+++ sys/net/if.c Sun Jul 15 23:47:15 2001
@@ -1412,8 +1412,8 @@
llsa = 0;
}
- MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
- MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
+ MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_NOWAIT);
+ MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_NOWAIT);
bcopy(sa, dupsa, sa->sa_len);
ifma->ifma_addr = dupsa;
@@ -1441,9 +1441,9 @@
ifma->ifma_refcount++;
} else {
MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
- M_IFMADDR, M_WAITOK);
+ M_IFMADDR, M_NOWAIT);
MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
- M_IFMADDR, M_WAITOK);
+ M_IFMADDR, M_NOWAIT);
bcopy(llsa, dupsa, llsa->sa_len);
ifma->ifma_addr = dupsa;
ifma->ifma_ifp = ifp;
--
Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
ume@mahoroba.org ume@bisd.hitachi.co.jp ume@{,jp.}FreeBSD.org
http://www.imasy.org/~ume/
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