From: Ben Hutchings ben.hutchings@mind.be
stable inclusion from stable-5.10.60 commit 1e78179d75fb796b015f4d71d01d8e8725fde466 bugzilla: 177018 https://gitee.com/openeuler/kernel/issues/I4EAUG
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit af01754f9e3c553a2ee63b4693c79a3956e230ab upstream.
When a VLAN is deleted from a port, the flags in struct switchdev_obj_port_vlan are always 0. ksz8_port_vlan_del() copies the BRIDGE_VLAN_INFO_UNTAGGED flag to the port's Tag Removal flag, and therefore always clears it.
In case there are multiple VLANs configured as untagged on this port - which seems useless, but is allowed - deleting one of them changes the remaining VLANs to be tagged.
It's only ever necessary to change this flag when a VLAN is added to the port, so leave it unchanged in ksz8_port_vlan_del().
Fixes: e66f840c08a2 ("net: dsa: ksz: Add Microchip KSZ8795 DSA driver") Signed-off-by: Ben Hutchings ben.hutchings@mind.be Signed-off-by: David S. Miller davem@davemloft.net [bwh: Backport to 5.10: adjust context] Signed-off-by: Ben Hutchings ben.hutchings@mind.be Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/net/dsa/microchip/ksz8795.c | 3 --- 1 file changed, 3 deletions(-)
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c index b4b164d75520..8f2b54ae57f2 100644 --- a/drivers/net/dsa/microchip/ksz8795.c +++ b/drivers/net/dsa/microchip/ksz8795.c @@ -895,7 +895,6 @@ static void ksz8795_port_vlan_add(struct dsa_switch *ds, int port, static int ksz8795_port_vlan_del(struct dsa_switch *ds, int port, const struct switchdev_obj_port_vlan *vlan) { - bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; struct ksz_device *dev = ds->priv; u16 data, vid, pvid; u8 fid, member, valid; @@ -904,8 +903,6 @@ static int ksz8795_port_vlan_del(struct dsa_switch *ds, int port, ksz_pread16(dev, port, REG_PORT_CTRL_VID, &pvid); pvid = pvid & 0xFFF;
- ksz_port_cfg(dev, port, P_TAG_CTRL, PORT_REMOVE_TAG, untagged); - for (vid = vlan->vid_begin; vid <= vlan->vid_end; vid++) { ksz8795_r_vlan_table(dev, vid, &data); ksz8795_from_vlan(data, &fid, &member, &valid);