The commit in the Fixes tag breaks my laptop (found by git bisect). My home RJ45 LAN cable cannot connect after that commit.
The call to netif_carrier_on() should be done when netif_carrier_ok() is false. Not when it's true. Because calling netif_carrier_on() when __LINK_STATE_NOCARRIER is not set actually does nothing.
Cc: Armando Budianto sprite@gnuweeb.org Cc: stable@vger.kernel.org Closes: https://lore.kernel.org/netdev/0752dee6-43d6-4e1f-81d2-4248142cccd2@gnuweeb.... Fixes: 0d9cfc9b8cb1 ("net: usbnet: Avoid potential RCU stall on LINK_CHANGE event") Signed-off-by: Ammar Faizi ammarfaizi2@gnuweeb.org ---
v2: - Rebase on top of the latest netdev/net tree. The previous patch was based on 0d9cfc9b8cb1. Line numbers have changed since then.
drivers/net/usb/usbnet.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index a38ffbf4b3f0..a1827684b92c 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1114,31 +1114,31 @@ static const struct ethtool_ops usbnet_ethtool_ops = { };
/*-------------------------------------------------------------------------*/
static void __handle_link_change(struct usbnet *dev) { if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) return;
if (!netif_carrier_ok(dev->net)) { + if (test_and_clear_bit(EVENT_LINK_CARRIER_ON, &dev->flags)) + netif_carrier_on(dev->net); + /* kill URBs for reading packets to save bus bandwidth */ unlink_urbs(dev, &dev->rxq);
/* * tx_timeout will unlink URBs for sending packets and * tx queue is stopped by netcore after link becomes off */ } else { - if (test_and_clear_bit(EVENT_LINK_CARRIER_ON, &dev->flags)) - netif_carrier_on(dev->net); - /* submitting URBs for reading packets */ queue_work(system_bh_wq, &dev->bh_work); }
/* hard_mtu or rx_urb_size may change during link change */ usbnet_update_max_qlen(dev);
clear_bit(EVENT_LINK_CHANGE, &dev->flags); }