netdev - [PATCH 1/1] net: usb: qmi_wwan: allow qmimux add/del with master up

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Message-Id: <20210304131513.3052-1-dnlplm@gmail.com>
Date:   Thu,  4 Mar 2021 14:15:13 +0100
From:   Daniele Palmas <dnlplm@...il.com>
To:     Bjørn Mork <bjorn@...k.no>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        Aleksander Morgado <aleksander@...ksander.es>,
        Daniele Palmas <dnlplm@...il.com>
Subject: [PATCH 1/1] net: usb: qmi_wwan: allow qmimux add/del with master up

There's no reason for preventing the creation and removal
of qmimux network interfaces when the underlying interface
is up.

This makes qmi_wwan mux implementation more similar to the
rmnet one, simplifying userspace management of the same
logical interfaces.

Fixes: c6adf77953bc ("net: usb: qmi_wwan: add qmap mux protocol support")
Reported-by: Aleksander Morgado <aleksander@...ksander.es>
Signed-off-by: Daniele Palmas <dnlplm@...il.com>
---
 drivers/net/usb/qmi_wwan.c | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 17a050521b86..6700f1970b24 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -429,13 +429,6 @@ static ssize_t add_mux_store(struct device *d,  struct device_attribute *attr, c
 		goto err;
 	}
 
-	/* we don't want to modify a running netdev */
-	if (netif_running(dev->net)) {
-		netdev_err(dev->net, "Cannot change a running device\n");
-		ret = -EBUSY;
-		goto err;
-	}
-
 	ret = qmimux_register_device(dev->net, mux_id);
 	if (!ret) {
 		info->flags |= QMI_WWAN_FLAG_MUX;
@@ -465,13 +458,6 @@ static ssize_t del_mux_store(struct device *d,  struct device_attribute *attr, c
 	if (!rtnl_trylock())
 		return restart_syscall();
 
-	/* we don't want to modify a running netdev */
-	if (netif_running(dev->net)) {
-		netdev_err(dev->net, "Cannot change a running device\n");
-		ret = -EBUSY;
-		goto err;
-	}
-
 	del_dev = qmimux_find_dev(dev, mux_id);
 	if (!del_dev) {
 		netdev_err(dev->net, "mux_id not present\n");
-- 
2.17.1