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Make sure that the first mbuf in the chain passed to atm_intr

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always contains a packet header.
This commit is contained in:
Hartmut Brandt 2004-02-21 13:01:54 +00:00
parent 962956583e
commit bf30351bdc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=126066
1 changed files with 8 additions and 4 deletions
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12
sys/dev/harp/if_harp.c
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@ -560,23 +560,27 @@ harp_input(struct ifnet *ifp, struct mbuf **mp, struct atm_pseudohdr *ah,
/* fit two pointers into the mbuf - assume, that the the data is
* pointer aligned. If it doesn't fit into the first mbuf, prepend
* another one, but leave the packet header where it is. atm_intr
* relies on this. */
* another one.
* Don't count the new fields in the packet length (XXX)
*/
mlen = m->m_pkthdr.len;
pfxlen = sizeof(atm_intr_func_t) + sizeof(void *);
if (M_LEADINGSPACE(m) < pfxlen) {
MGET(m0, 0, MT_DATA);
MGETHDR(m0, 0, MT_DATA);
if (m0 == NULL) {
printf("%s: no leading space in buffer\n", __func__);
goto drop;
}
m0->m_len = 0;
m0->m_next = m;
M_MOVE_PKTHDR(m0, m);
m = m0;
}
m->m_len += pfxlen;
m->m_data -= pfxlen;
KB_DATASTART(m, cp, char *);
cp = mtod(m, char *);
*((atm_intr_func_t *)cp) = harp_recv_stack;
cp += sizeof(atm_intr_func_t);
*((void **)cp) = (void *)vcc;