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Loosen the locking in nd6-free() again after r216022 to avoid

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a LOR and a recursed lock.

Reported by:	delphij
Tested by:	delphij
PR:		kern/148857
MFC After:	3 days
This commit is contained in:
Bjoern A. Zeeb 2010-12-07 22:43:29 +00:00
parent 7214d5d75b
commit 1d5089c2c2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216277
1 changed files with 24 additions and 13 deletions
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37
sys/netinet6/nd6.c
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@ -1053,15 +1053,6 @@ nd6_free(struct llentry *ln, int gc)
return (next);
}
if (ln->ln_router || dr) {
/*
* rt6_flush must be called whether or not the neighbor
* is in the Default Router List.
* See a corresponding comment in nd6_na_input().
*/
rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
}
if (dr) {
/*
* Unreachablity of a router might affect the default
@ -1077,7 +1068,27 @@ nd6_free(struct llentry *ln, int gc)
* or the entry itself will be deleted.
*/
ln->ln_state = ND6_LLINFO_INCOMPLETE;
}
if (ln->ln_router || dr) {
/*
* We need to unlock to avoid a LOR with rt6_flush() with the
* rnh and for the calls to pfxlist_onlink_check() and
* defrouter_select() in the block further down for calls
* into nd6_lookup(). We still hold a ref.
*/
LLE_WUNLOCK(ln);
/*
* rt6_flush must be called whether or not the neighbor
* is in the Default Router List.
* See a corresponding comment in nd6_na_input().
*/
rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
}
if (dr) {
/*
* Since defrouter_select() does not affect the
* on-link determination and MIP6 needs the check
@ -1087,13 +1098,13 @@ nd6_free(struct llentry *ln, int gc)
pfxlist_onlink_check();
/*
* Refresh default router list. Have to unlock as
* it calls into nd6_lookup(), still holding a ref.
* Refresh default router list.
*/
LLE_WUNLOCK(ln);
defrouter_select();
LLE_WLOCK(ln);
}
if (ln->ln_router || dr)
LLE_WLOCK(ln);
}
/*