Dear members,thx for welcome to me.I Have a server connect to modem(wavecom) via usb serial,last day i got some messages like below:

Sep 7 06:50:02 mkios kernel: ftdi_sio ttyUSB22: ftdi_submit_read_urb - failed submitting read urb, error -1
Sep 7 06:50:07 mkios kernel: ------------[ cut here ]------------
Sep 7 06:50:07 mkios kernel: WARNING: at drivers/usb/serial/usb-serial.c:406 serial_write_room+0x84/0x90 [usbserial]() (Tainted: G W --------------- )
Sep 7 06:50:07 mkios kernel: Hardware name: PowerEdge R720
Sep 7 06:50:07 mkios kernel: Modules linked in: bridge stp llc fuse tun autofs4 sunrpc ipv6 iptable_filter ip_tables power_meter ftdi_sio usbserial dcdbas microcode sb_edac edac_core iTCO_w
dt iTCO_vendor_support shpchp bnx2x libcrc32c mdio sg ses enclosure usb_storage ext4 mbcache jbd2 sr_mod cdrom sd_mod crc_t10dif ahci wmi megaraid_sas dm_mirror dm_region_hash dm_log dm_mod [
last unloaded: speedstep_lib]
Sep 7 06:50:07 mkios kernel: Pid: 51, comm: events/0 Tainted: G W --------------- 2.6.32-279.19.1.el6.x86_64 #1
Sep 7 06:50:07 mkios kernel: Call Trace:
Sep 7 06:50:07 mkios kernel: [<ffffffff8106a1e7>] ? warn_slowpath_common+0x87/0xc0
Sep 7 06:50:07 mkios kernel: [<ffffffff8106a23a>] ? warn_slowpath_null+0x1a/0x20
Sep 7 06:50:07 mkios kernel: [<ffffffffa01fc564>] ? serial_write_room+0x84/0x90 [usbserial]
Sep 7 06:50:07 mkios kernel: [<ffffffff8130eecd>] ? tty_write_room+0x1d/0x20
Sep 7 06:50:07 mkios kernel: [<ffffffff8130c188>] ? process_echoes+0x68/0x330
Sep 7 06:50:07 mkios kernel: [<ffffffff814eb13e>] ? mutex_lock+0x1e/0x50
Sep 7 06:50:07 mkios kernel: [<ffffffff8130eb0e>] ? n_tty_receive_buf+0xeee/0x1270
Sep 7 06:50:07 mkios kernel: [<ffffffff810096f0>] ? __switch_to+0xd0/0x320
Sep 7 06:50:07 mkios kernel: [<ffffffff814e9c50>] ? thread_return+0x4e/0x76e
Sep 7 06:50:07 mkios kernel: [<ffffffff813116c3>] ? flush_to_ldisc+0x183/0x1b0
Sep 7 06:50:07 mkios kernel: [<ffffffff81311540>] ? flush_to_ldisc+0x0/0x1b0
Sep 7 06:50:07 mkios kernel: [<ffffffff8108b120>] ? worker_thread+0x170/0x2a0
Sep 7 06:50:07 mkios kernel: [<ffffffff81090990>] ? autoremove_wake_function+0x0/0x40
Sep 7 06:50:07 mkios kernel: [<ffffffff8108afb0>] ? worker_thread+0x0/0x2a0
Sep 7 06:50:07 mkios kernel: [<ffffffff81090626>] ? kthread+0x96/0xa0
Sep 7 06:50:07 mkios kernel: [<ffffffff8100c0ca>] ? child_rip+0xa/0x20
Sep 7 06:50:07 mkios kernel: [<ffffffff81090590>] ? kthread+0x0/0xa0
Sep 7 06:50:07 mkios kernel: [<ffffffff8100c0c0>] ? child_rip+0x0/0x20
Sep 7 06:50:07 mkios kernel: ---[ end trace d3b076f82e75ec2e ]---


Problem with my modem or usb serial?Any idea.....