Problems with USB-Serial adapter after upgrade to 2.6.26-1
Hi all,
yesterday I did an "apt-get dist-upgrade" on my NSLU2 running Debian lenny
(armel version). Now I have kernel 2.6.26-1-ixp4xx.
I'm using an USB-to-Serial adapter based on the pl2303 chipset, which has
been working flawlessly with all previous versions of Debian I had
installed on that NSLU2. Now I get repeated errors on this interface, with
error messages in syslog like these:
Aug 30 20:20:06 slug kernel: [43051075.690000] ------------[ cut here
]------------
Aug 30 20:20:06 slug kernel: [43051075.690000] WARNING: at
drivers/usb/serial/usb-serial.c:322 serial_write_room+0x50/0x7c
[usbserial]()
Aug 30 20:20:06 slug kernel: [43051075.700000] Modules linked in: evdev
pl2303 ixp4xx_beeper ixp4xx_eth ixp4xx_npe firmware_class ixp4xx_qmgr
usbserial ext3 jbd mbcache sd_mod usb_storage scsi_mod ohci_hcd ehci_hcd
usbcore
Aug 30 20:20:06 slug kernel: [43051075.720000] [<c0029f74>]
(dump_stack+0x0/0x14) from [<c003e6bc>] (warn_on_slowpath+0x4c/0x84)
Aug 30 20:20:06 slug kernel: [43051075.730000] [<c003e670>]
(warn_on_slowpath+0x0/0x84) from [<bf09d4d0>] (serial_write_room+0x50/0x7c
[usbserial])
Aug 30 20:20:06 slug kernel: [43051075.740000] r6:c0950400 r5:00000043
r4:c1c4b000
Aug 30 20:20:06 slug kernel: [43051075.740000] [<bf09d480>]
(serial_write_room+0x0/0x7c [usbserial]) from [<c01531e8>]
(tty_write_room+0x24/0x30)
Aug 30 20:20:06 slug kernel: [43051075.750000] r4:c0950400
Aug 30 20:20:06 slug kernel: [43051075.760000] [<c01531c4>]
(tty_write_room+0x0/0x30) from [<c015107c>] (opost+0x1c/0x1b0)
Aug 30 20:20:06 slug kernel: [43051075.760000] [<c0151060>]
(opost+0x0/0x1b0) from [<c0151278>] (echo_char+0x68/0x70)
Aug 30 20:20:06 slug kernel: [43051075.770000] r5:c0950400 r4:00000043
Aug 30 20:20:06 slug kernel: [43051075.780000] [<c0151210>]
(echo_char+0x0/0x70) from [<c0152720>] (n_tty_receive_buf+0xb88/0xe08)
Aug 30 20:20:06 slug kernel: [43051075.780000] r5:c0950c00 r4:00000043
Aug 30 20:20:06 slug kernel: [43051075.790000] [<c0151b98>]
(n_tty_receive_buf+0x0/0xe08) from [<c014e70c>]
(flush_to_ldisc+0xdc/0x174)
Aug 30 20:20:06 slug kernel: [43051075.800000] [<c014e630>]
(flush_to_ldisc+0x0/0x174) from [<c004ea70>] (run_workqueue+0xbc/0x150)
Aug 30 20:20:06 slug kernel: [43051075.810000] r8:00000000 r7:00000000
r6:c014e630 r5:c1c26000 r4:c1c01940
Aug 30 20:20:06 slug kernel: [43051075.810000] [<c004e9b4>]
(run_workqueue+0x0/0x150) from [<c004f524>] (worker_thread+0xa8/0xbc)
Aug 30 20:20:06 slug kernel: [43051075.820000] r6:c004f47c r5:c1c01940
r4:c1c01948
Aug 30 20:20:06 slug kernel: [43051075.830000] [<c004f47c>]
(worker_thread+0x0/0xbc) from [<c0052588>] (kthread+0x5c/0x94)
Aug 30 20:20:06 slug kernel: [43051075.840000] r5:c1c01940 r4:c1c26000
Aug 30 20:20:06 slug kernel: [43051075.840000] [<c005252c>]
(kthread+0x0/0x94) from [<c00419b0>] (do_exit+0x0/0x6a4)
Aug 30 20:20:06 slug kernel: [43051075.850000] r6:00000000 r5:00000000
r4:00000000
Aug 30 20:20:06 slug kernel: [43051075.850000] ---[ end trace
28dbfda44f8c329c ]---
Aug 30 20:20:06 slug kernel: [43051075.860000] ------------[ cut here
]------------
Aug 30 20:20:06 slug kernel: [43051075.860000] WARNING: at
drivers/usb/serial/usb-serial.c:309 serial_write+0x74/0xac [usbserial]()
Aug 30 20:20:06 slug kernel: [43051075.870000] Modules linked in: evdev
pl2303 ixp4xx_beeper ixp4xx_eth ixp4xx_npe firmware_class ixp4xx_qmgr
usbserial ext3 jbd mbcache sd_mod usb_storage scsi_mod ohci_hcd ehci_hcd
usbcore
Aug 30 20:20:06 slug kernel: [43051075.890000] [<c0029f74>]
(dump_stack+0x0/0x14) from [<c003e6bc>] (warn_on_slowpath+0x4c/0x84)
Aug 30 20:20:06 slug kernel: [43051075.900000] [<c003e670>]
(warn_on_slowpath+0x0/0x84) from [<bf09d570>] (serial_write+0x74/0xac
[usbserial])
Aug 30 20:20:06 slug kernel: [43051075.910000] r6:c1c27e5f r5:00000001
r4:c1c4b000
Aug 30 20:20:06 slug kernel: [43051075.910000] [<bf09d4fc>]
(serial_write+0x0/0xac [usbserial]) from [<c014cdc8>]
(tty_put_char+0x40/0x48)
Aug 30 20:20:06 slug kernel: [43051075.920000] r6:c0950400 r5:00000043
r4:c0950400
Aug 30 20:20:06 slug kernel: [43051075.930000] [<c014cd88>]
(tty_put_char+0x0/0x48) from [<c01511e4>] (opost+0x184/0x1b0)
Aug 30 20:20:06 slug kernel: [43051075.940000] [<c0151060>]
(opost+0x0/0x1b0) from [<c0151278>] (echo_char+0x68/0x70)
Aug 30 20:20:06 slug kernel: [43051075.950000] r5:c0950400 r4:00000043
Aug 30 20:20:06 slug kernel: [43051075.950000] [<c0151210>]
(echo_char+0x0/0x70) from [<c0152720>] (n_tty_receive_buf+0xb88/0xe08)
Aug 30 20:20:06 slug kernel: [43051075.960000] r5:c0950c00 r4:00000043
Aug 30 20:20:06 slug kernel: [43051075.960000] [<c0151b98>]
(n_tty_receive_buf+0x0/0xe08) from [<c014e70c>]
(flush_to_ldisc+0xdc/0x174)
Aug 30 20:20:06 slug kernel: [43051075.970000] [<c014e630>]
(flush_to_ldisc+0x0/0x174) from [<c004ea70>] (run_workqueue+0xbc/0x150)
Aug 30 20:20:06 slug kernel: [43051075.980000] r8:00000000 r7:00000000
r6:c014e630 r5:c1c26000 r4:c1c01940
Aug 30 20:20:06 slug kernel: [43051075.990000] [<c004e9b4>]
(run_workqueue+0x0/0x150) from [<c004f524>] (worker_thread+0xa8/0xbc)
Aug 30 20:20:06 slug kernel: [43051076.000000] r6:c004f47c r5:c1c01940
r4:c1c01948
Aug 30 20:20:06 slug kernel: [43051076.000000] [<c004f47c>]
(worker_thread+0x0/0xbc) from [<c0052588>] (kthread+0x5c/0x94)
Aug 30 20:20:06 slug kernel: [43051076.010000] r5:c1c01940 r4:c1c26000
Aug 30 20:20:06 slug kernel: [43051076.020000] [<c005252c>]
(kthread+0x0/0x94) from [<c00419b0>] (do_exit+0x0/0x6a4)
Aug 30 20:20:06 slug kernel: [43051076.020000] r6:00000000 r5:00000000
r4:00000000
Aug 30 20:20:06 slug kernel: [43051076.030000] ---[ end trace
28dbfda44f8c329c ]---
These errors happen at irregular intervals, in between the serial
communication works ok. I don't know how to interpret the error messages.
Is this a known problem, and what can I do about it?
Please let me know if more detailed information is necessary to track down
this problem.
Regards, Richard
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