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Subject[PATCH] arp: Remove the arp_hh_ops structure
Date
The arp_hh_ops structure is similar to the arp_generic_ops structure.
but the latter is more general,so remove the arp_hh_ops structure.

Fix when took out the neigh->ops assignment:
8.973653] #PF: supervisor read access in kernel mode
[ 8.975027] #PF: error_code(0x0000) - not-present page
[ 8.976310] PGD 0 P4D 0
[ 8.977036] Oops: 0000 [#1] SMP PTI
[ 8.977973] CPU: 1 PID: 210 Comm: sd-resolve Not tainted 5.11.0-rc7-02046-g4591591ab715 #1
[ 8.979998] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 8.981996] RIP: 0010:neigh_probe (kbuild/src/consumer/net/core/neighbour.c:1009)

Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Yejune Deng <yejune.deng@gmail.com>
---
net/ipv4/arp.c | 15 ++-------------
1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 922dd73e5740..9ee59c2e419a 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -135,14 +135,6 @@ static const struct neigh_ops arp_generic_ops = {
.connected_output = neigh_connected_output,
};

-static const struct neigh_ops arp_hh_ops = {
- .family = AF_INET,
- .solicit = arp_solicit,
- .error_report = arp_error_report,
- .output = neigh_resolve_output,
- .connected_output = neigh_resolve_output,
-};
-
static const struct neigh_ops arp_direct_ops = {
.family = AF_INET,
.output = neigh_direct_output,
@@ -277,12 +269,9 @@ static int arp_constructor(struct neighbour *neigh)
memcpy(neigh->ha, dev->broadcast, dev->addr_len);
}

- if (dev->header_ops->cache)
- neigh->ops = &arp_hh_ops;
- else
- neigh->ops = &arp_generic_ops;
+ neigh->ops = &arp_generic_ops;

- if (neigh->nud_state & NUD_VALID)
+ if (!dev->header_ops->cache && (neigh->nud_state & NUD_VALID))
neigh->output = neigh->ops->connected_output;
else
neigh->output = neigh->ops->output;
--
2.29.0
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