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Add in some INVARIANT checks in the TX mbuf descriptor "freelist" management code.

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Slot 0 must always remain "free" and be a pointer to the first free entry in the
mbuf descriptor list. It is thus an error to have code allocate or push slot 0
back into the list.
This commit is contained in:
Adrian Chadd 2009-05-27 01:45:23 +00:00
parent 7e1e3d9462
commit 0e6993e4a7
1 changed files with 2 additions and 0 deletions
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2
sys/dev/xen/netfront/netfront.c
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@ -310,6 +310,7 @@ struct netfront_rx_info {
static inline void
add_id_to_freelist(struct mbuf **list, unsigned short id)
{
KASSERT(id != 0, ("add_id_to_freelist: the head item (0) must always be free."));
list[id] = list[0];
list[0] = (void *)(u_long)id;
}
@ -318,6 +319,7 @@ static inline unsigned short
get_id_from_freelist(struct mbuf **list)
{
u_int id = (u_int)(u_long)list[0];
KASSERT(id != 0, ("get_id_from_freelist: the head item (0) must always remain free."));
list[0] = list[id];
return (id);
}