>> -----Original Message----- >> From: Johan Hovold [mailto:jhovold@xxxxxxxxx] >> Sent: Tuesday, November 26, 2013 6:39 AM >> To: Dmitry Kunilov >> Cc: linux-usb@xxxxxxxxxxxxxxx >> Subject: Re: zte_ev not properly handling ZTE AC2726 CDMA modems >> >> On Mon, Nov 25, 2013 at 06:15:28PM -0800, Dmitry Kunilov wrote: >> > Hi everyone, >> > >> > As a late follow-up to the discussion that happened in June about >> > moving support for most ZTE CDMA devices from option.c to zte_ev.c >> > (where the decision was to "convert and see if anyone complains"), >> > I'd like to complain >> > :) >> > >> > We have a park of approximately thirty ZTE AC2726 EVDO modems >> > connected to Broadcom-based routers running Linux-mips. After recent >> > upgrade from ancient >> > 2.6.22 to relatively modern 3.9.11, all 30 are having the same >> > problem: pppd connects and Internet access works for 20 to 60 >> > seconds, then connectivity drops and pppd logs an LCP timeout. After >> > that, pppd is able to restart the connection and run for another 20-60 seconds. >> > >> > I did notice that these modems are now handled by zte_ev instead of >> > option, so I went and moved all the DEVICE_INFO's back from zte_ev.c >> > to option.c and also disabled zte_ev module in the kernel >> > configuration. After this change, the modems work just fine, like >> > they did on 2.6.22 - using the option driver. >> > >> > Please let me know if there is any debug info I can collect to help > > resolve this issue. >> >> Would you mind trying the patch below (against v3.12)? >> >> Thanks, >> Johan > >On Tue, Nov 26, 2013 at 12:37:21PM -0800, Dmitry Kunilov wrote: >> Hi Jonah, >> >> Do you think this patch will work against 3.9.11? If not, I'll have to >> invest some time into upgrading to 3.12 which proved to be difficult >> given all the Broadcom-related modifications in the kernel.. > >Yes, the patch should work on 3.9 as well, although it might not apply cleanly. Try the patch below instead if your stuck with 3.9. > >Thanks, >Johan The patch didn't fix the problem. I am attaching the output that I am getting in the syslog. Note that I have two usb modems connected to that router and that's how I am able to debug it. 2-1 is an external USB2.0 hub, 2-1.2 is the ZTE modem, and 2-1.1 is a Huawei CDMA modem, which is working fine. The problem happens both with and without a hub. Dmitry.
Nov 26 22:31:28 iqvpn daemon.notice pppd[647]: local IP address 10.182.147.158 Nov 26 22:31:28 iqvpn daemon.notice pppd[647]: remote IP address 192.168.50.12 Nov 26 22:31:28 iqvpn daemon.notice pppd[647]: primary DNS address 213.55.96.148 Nov 26 22:31:28 iqvpn daemon.notice pppd[647]: secondary DNS address 213.55.96.166 Nov 26 22:31:58 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 1, a5 ep4 t10008d82 Nov 26 22:31:58 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 1, a5 ep6 t10008d80 Nov 26 22:31:59 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 1, a5 ep6 t10008d80 Nov 26 22:32:00 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 2, a6 ep4 t08008d82 Nov 26 22:32:00 iqvpn kern.warn kernel: zte_ev ttyUSB4: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:00 iqvpn kern.warn kernel: zte_ev ttyUSB4: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:01 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 1, a5 ep6 t90008d80 Nov 26 22:32:03 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 2, a6 ep4 t08008d82 Nov 26 22:32:03 iqvpn kern.warn kernel: zte_ev ttyUSB4: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:03 iqvpn kern.warn kernel: zte_ev ttyUSB4: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:17 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 1, a5 ep6 t90008d80 Nov 26 22:32:19 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 2, a6 ep4 t08008d82 Nov 26 22:32:19 iqvpn kern.warn kernel: zte_ev ttyUSB4: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:19 iqvpn kern.warn kernel: zte_ev ttyUSB4: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:31 iqvpn kern.warn kernel: zte_ev ttyUSB5: usb_serial_generic_write_bulk_callback - non-zero urb status: -2 Nov 26 22:32:31 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 2, a6 ep7 t00018c82 Nov 26 22:32:31 iqvpn kern.warn kernel: zte_ev ttyUSB5: usb_serial_generic_write_bulk_callback - non-zero urb status: -2 Nov 26 22:32:31 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 2, a6 ep7 t08008d82 Nov 26 22:32:31 iqvpn kern.warn kernel: zte_ev ttyUSB5: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:31 iqvpn kern.warn kernel: zte_ev ttyUSB5: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:33 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 2, a6 ep8 t08008d80 Nov 26 22:32:33 iqvpn kern.warn kernel: zte_ev ttyUSB6: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:33 iqvpn kern.warn kernel: zte_ev ttyUSB6: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:38 iqvpn daemon.info pppd[647]: No response to 3 echo-requests Nov 26 22:32:38 iqvpn daemon.notice pppd[647]: Serial link appears to be disconnected. Nov 26 22:32:38 iqvpn daemon.info pppd[647]: Connect time 1.2 minutes. Nov 26 22:32:38 iqvpn daemon.info pppd[647]: Sent 30395 bytes, received 41872 bytes. Nov 26 22:32:44 iqvpn daemon.notice pppd[647]: Connection terminated. Nov 26 22:32:44 iqvpn local2.info chat[1731]: abort on (BUSY) Nov 26 22:32:44 iqvpn local2.info chat[1731]: abort on (ERROR) Nov 26 22:32:44 iqvpn local2.info chat[1731]: abort on (NO DIALTONE) Nov 26 22:32:44 iqvpn local2.info chat[1731]: timeout set to 10 seconds Nov 26 22:32:44 iqvpn local2.info chat[1731]: send (+++) Nov 26 22:32:44 iqvpn local2.info chat[1731]: send (ATH^M) Nov 26 22:32:44 iqvpn daemon.info pppd[647]: Serial link disconnected. Nov 26 22:32:44 iqvpn kern.warn kernel: zte_ev ttyUSB3: usb_serial_generic_read_bulk_callback - non-zero urb status: -2 Nov 26 22:32:44 iqvpn daemon.notice pppd[647]: Modem hangup Nov 26 22:32:44 iqvpn kern.debug kernel: usb 2-1: clear tt buffer port 2, a6 ep2 t88008d80 Nov 26 22:32:44 iqvpn kern.warn kernel: zte_ev ttyUSB3: usb_serial_generic_read_bulk_callback - non-zero urb status: -2
