The sysfs path may not exist due to race conditions while accessing sysfs. It's better to check the prefix 'wlan' as the last fallback method.
For example, 'wlan0' has been renamed to 'wlp1s0', but it's still checking 'wlan0' above so it will always fail. You can see this problem below. Nov 28 06:22:36 u-Precision-5520 kernel: ath10k_pci 0000:01:00.0 wlp1s0: renamed from wlan0 Nov 28 06:22:36 u-Precision-5520 NetworkManager[772]: <trace> [1480332156.5568] platform-linux: event-notification: NEWLINK, seq 0: 2: wlan0 <DOWN;broadcast,multicast> mtu 1500 arp 1 ethernet? not-init addrgenmode eui64 addr 40:49:0F:8A:E5:97 Nov 28 06:22:36 u-Precision-5520 NetworkManager[772]: <debug> [1480332156.5568] platform: signal: link added: 2: wlan0 <DOWN;broadcast,multicast> mtu 1500 arp 1 ethernet? not-init addrgenmode eui64 addr 40:49:0F:8A:E5:97 driver unknown Nov 28 06:22:36 u-Precision-5520 NetworkManager[772]: <warn> [1480332156.5569] device (wlan0): failed to find device 2 'wlan0' with udev Nov 28 06:22:36 u-Precision-5520 NetworkManager[772]: <info> [1480332156.5569] device (wlan0): driver '(null)' does not support carrier detection. Nov 28 06:22:36 u-Precision-5520 NetworkManager[772]: <debug> [1480332156.5569] device[0xab4b80] (wlan0): constructed (NMDeviceEthernet) Nov 28 06:22:36 u-Precision-5520 NetworkManager[772]: <debug> [1480332156.5569] device[0xab4b80] (wlan0): start setup of NMDeviceEthernet, kernel ifindex 2 Nov 28 06:22:36 u-Precision-5520 NetworkManager[772]: <debug> [1480332156.5570] platform-linux: error reading /sys/class/net/wlan0/phys_port_id: Failed to open file '/sys/class/net/wlan0/phys_port_id': No such file or directory Nov 28 06:22:36 u-Precision-5520 NetworkManager[772]: <debug> [1480332156.5570] platform-linux: error reading /sys/class/net/wlan0/dev_id: Failed to open file '/sys/class/net/wlan0/dev_id': No such file or directory After the device type is decided as NM_LINK_TYPE_ETHERNET, there is no way back unless NetworkManager will check all device types again, but it won't do that. Shih-Yuan Lee (FourDollars) (1): linux: check the prefix 'wlan' for WiFi device as the last fallback src/platform/wifi/wifi-utils.c | 9 +++++++++ 1 file changed, 9 insertions(+) -- 2.7.4 _______________________________________________ networkmanager-list mailing list [email protected] https://mail.gnome.org/mailman/listinfo/networkmanager-list
