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authorVladimir Oltean <olteanv@gmail.com>2019-11-16 18:08:25 +0200
committerDavid S. Miller <davem@davemloft.net>2019-11-16 12:23:53 -0800
commitc80ed84e76886487703bf04b38ce10e92e2d6e26 (patch)
tree86c08fae6406be9cb32fd74fe477fa1e1d7ddf67
parente84fa0aebf33e776afab72d2008ac1524c38f7d9 (diff)
downloadlinux-sh-c80ed84e76886487703bf04b38ce10e92e2d6e26.tar.gz
net: dsa: tag_8021q: Fix dsa_8021q_restore_pvid for an absent pvid
This sequence of operations: ip link set dev br0 type bridge vlan_filtering 1 bridge vlan del dev swp2 vid 1 ip link set dev br0 type bridge vlan_filtering 1 ip link set dev br0 type bridge vlan_filtering 0 apparently fails with the message: [ 31.305716] sja1105 spi0.1: Reset switch and programmed static config. Reason: VLAN filtering [ 31.322161] sja1105 spi0.1: Couldn't determine PVID attributes (pvid 0) [ 31.328939] sja1105 spi0.1: Failed to setup VLAN tagging for port 1: -2 [ 31.335599] ------------[ cut here ]------------ [ 31.340215] WARNING: CPU: 1 PID: 194 at net/switchdev/switchdev.c:157 switchdev_port_attr_set_now+0x9c/0xa4 [ 31.349981] br0: Commit of attribute (id=6) failed. [ 31.354890] Modules linked in: [ 31.357942] CPU: 1 PID: 194 Comm: ip Not tainted 5.4.0-rc6-01792-gf4f632e07665-dirty #2062 [ 31.366167] Hardware name: Freescale LS1021A [ 31.370437] [<c03144dc>] (unwind_backtrace) from [<c030e184>] (show_stack+0x10/0x14) [ 31.378153] [<c030e184>] (show_stack) from [<c11d1c1c>] (dump_stack+0xe0/0x10c) [ 31.385437] [<c11d1c1c>] (dump_stack) from [<c034c730>] (__warn+0xf4/0x10c) [ 31.392373] [<c034c730>] (__warn) from [<c034c7bc>] (warn_slowpath_fmt+0x74/0xb8) [ 31.399827] [<c034c7bc>] (warn_slowpath_fmt) from [<c11ca204>] (switchdev_port_attr_set_now+0x9c/0xa4) [ 31.409097] [<c11ca204>] (switchdev_port_attr_set_now) from [<c117036c>] (__br_vlan_filter_toggle+0x6c/0x118) [ 31.418971] [<c117036c>] (__br_vlan_filter_toggle) from [<c115d010>] (br_changelink+0xf8/0x518) [ 31.427637] [<c115d010>] (br_changelink) from [<c0f8e9ec>] (__rtnl_newlink+0x3f4/0x76c) [ 31.435613] [<c0f8e9ec>] (__rtnl_newlink) from [<c0f8eda8>] (rtnl_newlink+0x44/0x60) [ 31.443329] [<c0f8eda8>] (rtnl_newlink) from [<c0f89f20>] (rtnetlink_rcv_msg+0x2cc/0x51c) [ 31.451477] [<c0f89f20>] (rtnetlink_rcv_msg) from [<c1008df8>] (netlink_rcv_skb+0xb8/0x110) [ 31.459796] [<c1008df8>] (netlink_rcv_skb) from [<c1008648>] (netlink_unicast+0x17c/0x1f8) [ 31.468026] [<c1008648>] (netlink_unicast) from [<c1008980>] (netlink_sendmsg+0x2bc/0x3b4) [ 31.476261] [<c1008980>] (netlink_sendmsg) from [<c0f43858>] (___sys_sendmsg+0x230/0x250) [ 31.484408] [<c0f43858>] (___sys_sendmsg) from [<c0f44c84>] (__sys_sendmsg+0x50/0x8c) [ 31.492209] [<c0f44c84>] (__sys_sendmsg) from [<c0301000>] (ret_fast_syscall+0x0/0x28) [ 31.500090] Exception stack(0xedf47fa8 to 0xedf47ff0) [ 31.505122] 7fa0: 00000002 b6f2e060 00000003 beabd6a4 00000000 00000000 [ 31.513265] 7fc0: 00000002 b6f2e060 5d6e3213 00000128 00000000 00000001 00000006 000619c4 [ 31.521405] 7fe0: 00086078 beabd658 0005edbc b6e7ce68 The reason is the implementation of br_get_pvid: static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) { if (!vg) return 0; smp_rmb(); return vg->pvid; } Since VID 0 is an invalid pvid from the bridge's point of view, let's add this check in dsa_8021q_restore_pvid to avoid restoring a pvid that doesn't really exist. Fixes: 5f33183b7fdf ("net: dsa: tag_8021q: Restore bridge VLANs when enabling vlan_filtering") Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/dsa/tag_8021q.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/dsa/tag_8021q.c b/net/dsa/tag_8021q.c
index 9c1cc2482b68..9e5a883a9f0c 100644
--- a/net/dsa/tag_8021q.c
+++ b/net/dsa/tag_8021q.c
@@ -106,7 +106,7 @@ static int dsa_8021q_restore_pvid(struct dsa_switch *ds, int port)
slave = ds->ports[port].slave;
err = br_vlan_get_pvid(slave, &pvid);
- if (err < 0)
+ if (!pvid || err < 0)
/* There is no pvid on the bridge for this port, which is
* perfectly valid. Nothing to restore, bye-bye!
*/