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bonding: fix double dev_add_pack

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Bonding can erroneously register the same packet_type to receive
ARPs (for use by ARP validation): once at device open time, and once via
sysfs.  Since sysfs can change the validate setting (and thus register
or unregister) at any time, a flag is needed to synchronize with device
open in order to avoid double registrations, and the simplest place is
within the packet_type structure itself.  Double unregister is not an
issue.

	Bug reported by Ulrich Oelmann <ulrich.oelmann@web.de>.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jay Vosburgh 2007-02-28 17:03:20 -08:00 committed by Jeff Garzik
parent c3442e2965
commit c4f283b1f2
1 changed files with 7 additions and 1 deletions
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8
drivers/net/bonding/bond_main.c
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@ -3423,6 +3423,9 @@ void bond_register_arp(struct bonding *bond)
{
struct packet_type *pt = &bond->arp_mon_pt;
if (pt->type)
return;
pt->type = htons(ETH_P_ARP);
pt->dev = NULL; /*bond->dev;XXX*/
pt->func = bond_arp_rcv;
@ -3431,7 +3434,10 @@ void bond_register_arp(struct bonding *bond)
void bond_unregister_arp(struct bonding *bond)
{
dev_remove_pack(&bond->arp_mon_pt);
struct packet_type *pt = &bond->arp_mon_pt;
dev_remove_pack(pt);
pt->type = 0;
}
/*---------------------------- Hashing Policies -----------------------------*/