dpaa2-eth: destroy workqueue at the end of remove function

stable inclusion
from stable-v5.10.84
commit e26dab79e16b73efe878335d8cbab8a03f4995f4
bugzilla: 186030 https://gitee.com/openeuler/kernel/issues/I4QV2F

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e26dab79e16b73efe878335d8cbab8a03f4995f4

--------------------------------

commit f4a8adbf upstream.

The commit c5521189 ("dpaa2-eth: support PTP Sync packet one-step
timestamping") forgets to destroy workqueue at the end of remove
function.

Fix this by adding destroy_workqueue before fsl_mc_portal_free and
free_netdev.

Fixes: c5521189 ("dpaa2-eth: support PTP Sync packet one-step timestamping")
Signed-off-by: NDongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

@@ -4432,6 +4432,8 @@ static int dpaa2_eth_remove(struct fsl_mc_device *ls_dev)
 
 	fsl_mc_portal_free(priv->mc_io);
 
+	destroy_workqueue(priv->dpaa2_ptp_wq);
+
 	dev_dbg(net_dev->dev.parent, "Removed interface %s\n", net_dev->name);
 
 	free_netdev(net_dev);