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Date: Fri, 04 Sep 2009 10:09:31 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: gregkh@...e.de
CC: miklos@...redi.hu, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, alan@...ux.intel.com,
stern@...land.harvard.edu
Subject: Re: WARNINGs in usb-serial.c
On Thu, 3 Sep 2009, Greg KH wrote:
> On Thu, Sep 03, 2009 at 04:13:34PM +0200, Miklos Szeredi wrote:
> > I get the following warnings in 2.6.31-rc. A lot of them:
> >
> > WARNING: at drivers/usb/serial/usb-serial.c:414 serial_write_room+0x59/0x6e [usbserial]()
> > WARNING: at drivers/usb/serial/usb-serial.c:401 serial_write+0x77/0x9d [usbserial]()
> >
> > This is a huawei-3565 modem.
> >
> > The messages don't seem to hurt, but there's lot of trouble with this
> > gadget. Sometimes it just doesn't work after a while and a reboot is
> > needed. Sometimes it hangs the kernel after suspend, etc. Not sure
> > if this is related to the warnings...
>
> {sigh}
>
> The tty layer changes are being a pain here :(
>
> Alan Stern posted a set of patches to the linux-usb list to hopefully
> address stuff like this, is there any way you could test them out to see
> if they help or not?
Nope, it doesn't seem to help. Still got the same warnings with the
patched kernel (latest git + ghk tree + usbserial patches).
Thanks,
Miklos
[ 1658.280527] ------------[ cut here ]------------
[ 1658.280546] WARNING: at drivers/usb/serial/usb-serial.c:421 serial_write_room+0x59/0x6e [usbserial]()
[ 1658.280552] Hardware name: 2007FUG
[ 1658.280556] Modules linked in: option usbserial usb_storage bnep rfcomm sco l2cap acpi_cpufreq nf_conntrack_netbios_ns microcode fuse iwl3945 iwlcore thinkpad_acpi mac80211 backlight btusb led_class bluetooth thermal ac battery processor button nsc_ircc irda crc_ccitt cfg80211 rfkill e1000e uinput [last unloaded: usbserial]
[ 1658.280629] Pid: 9, comm: events/0 Not tainted 2.6.31-rc8-gkh-00038-g37d0892-dirty #33
[ 1658.280634] Call Trace:
[ 1658.280650] [<ffffffffa01ca72c>] ? serial_write_room+0x59/0x6e [usbserial]
[ 1658.280663] [<ffffffff81041d0d>] warn_slowpath_common+0x7c/0xa9
[ 1658.280672] [<ffffffff81041d4e>] warn_slowpath_null+0x14/0x16
[ 1658.280684] [<ffffffffa01ca72c>] serial_write_room+0x59/0x6e [usbserial]
[ 1658.280695] [<ffffffff811c273d>] tty_write_room+0x1d/0x1f
[ 1658.280702] [<ffffffff811c0111>] process_echoes+0x59/0x289
[ 1658.280712] [<ffffffff8131da65>] ? mutex_unlock+0xe/0x10
[ 1658.280720] [<ffffffff811c2078>] n_tty_receive_buf+0xa28/0xebd
[ 1658.280731] [<ffffffff81067ed8>] ? mark_held_locks+0x4d/0x6b
[ 1658.280740] [<ffffffff8131fa88>] ? _spin_unlock_irqrestore+0x44/0x72
[ 1658.280748] [<ffffffff8106814b>] ? trace_hardirqs_on_caller+0x10b/0x12f
[ 1658.280757] [<ffffffff811c47ef>] flush_to_ldisc+0x12f/0x1d7
[ 1658.280767] [<ffffffff810542f7>] worker_thread+0x234/0x350
[ 1658.280775] [<ffffffff810542a0>] ? worker_thread+0x1dd/0x350
[ 1658.280783] [<ffffffff811c46c0>] ? flush_to_ldisc+0x0/0x1d7
[ 1658.280791] [<ffffffff81059226>] ? autoremove_wake_function+0x0/0x3d
[ 1658.280800] [<ffffffff8106817c>] ? trace_hardirqs_on+0xd/0xf
[ 1658.280808] [<ffffffff810540c3>] ? worker_thread+0x0/0x350
[ 1658.280815] [<ffffffff81058e34>] kthread+0x94/0x9c
[ 1658.280824] [<ffffffff8100c29a>] child_rip+0xa/0x20
[ 1658.280832] [<ffffffff8100bc00>] ? restore_args+0x0/0x30
[ 1658.280839] [<ffffffff81058da0>] ? kthread+0x0/0x9c
[ 1658.280846] [<ffffffff8100c290>] ? child_rip+0x0/0x20
[ 1658.280851] ---[ end trace 644f4c2ff2fe597f ]---
[ 1658.280856] ------------[ cut here ]------------
[ 1658.280868] WARNING: at drivers/usb/serial/usb-serial.c:408 serial_write+0x77/0x9d [usbserial]()
[ 1658.280873] Hardware name: 2007FUG
[ 1658.280876] Modules linked in: option usbserial usb_storage bnep rfcomm sco l2cap acpi_cpufreq nf_conntrack_netbios_ns microcode fuse iwl3945 iwlcore thinkpad_acpi mac80211 backlight btusb led_class bluetooth thermal ac battery processor button nsc_ircc irda crc_ccitt cfg80211 rfkill e1000e uinput [last unloaded: usbserial]
[ 1658.280940] Pid: 9, comm: events/0 Tainted: G W 2.6.31-rc8-gkh-00038-g37d0892-dirty #33
[ 1658.280945] Call Trace:
[ 1658.280957] [<ffffffffa01ca7b8>] ? serial_write+0x77/0x9d [usbserial]
[ 1658.280966] [<ffffffff81041d0d>] warn_slowpath_common+0x7c/0xa9
[ 1658.280974] [<ffffffff81041d4e>] warn_slowpath_null+0x14/0x16
[ 1658.280986] [<ffffffffa01ca7b8>] serial_write+0x77/0x9d [usbserial]
[ 1658.280994] [<ffffffff811bc4b9>] tty_put_char+0x32/0x34
[ 1658.281002] [<ffffffff811bff14>] do_output_char+0xb3/0x201
[ 1658.281016] [<ffffffff811c0294>] process_echoes+0x1dc/0x289
[ 1658.281024] [<ffffffff811c2078>] n_tty_receive_buf+0xa28/0xebd
[ 1658.281033] [<ffffffff81067ed8>] ? mark_held_locks+0x4d/0x6b
[ 1658.281042] [<ffffffff8131fa88>] ? _spin_unlock_irqrestore+0x44/0x72
[ 1658.281050] [<ffffffff8106814b>] ? trace_hardirqs_on_caller+0x10b/0x12f
[ 1658.281059] [<ffffffff811c47ef>] flush_to_ldisc+0x12f/0x1d7
[ 1658.281068] [<ffffffff810542f7>] worker_thread+0x234/0x350
[ 1658.281103] [<ffffffff810542a0>] ? worker_thread+0x1dd/0x350
[ 1658.281111] [<ffffffff811c46c0>] ? flush_to_ldisc+0x0/0x1d7
[ 1658.281119] [<ffffffff81059226>] ? autoremove_wake_function+0x0/0x3d
[ 1658.281128] [<ffffffff8106817c>] ? trace_hardirqs_on+0xd/0xf
[ 1658.281136] [<ffffffff810540c3>] ? worker_thread+0x0/0x350
[ 1658.281143] [<ffffffff81058e34>] kthread+0x94/0x9c
[ 1658.281151] [<ffffffff8100c29a>] child_rip+0xa/0x20
[ 1658.281159] [<ffffffff8100bc00>] ? restore_args+0x0/0x30
[ 1658.281166] [<ffffffff81058da0>] ? kthread+0x0/0x9c
[ 1658.281173] [<ffffffff8100c290>] ? child_rip+0x0/0x20
[ 1658.281177] ---[ end trace 644f4c2ff2fe5980 ]---
[ 1658.281189] ------------[ cut here ]------------
[ 1658.281201] WARNING: at drivers/usb/serial/usb-serial.c:408 serial_write+0x77/0x9d [usbserial]()
[ 1658.281229] Hardware name: 2007FUG
[ 1658.281232] Modules linked in: option usbserial usb_storage bnep rfcomm sco l2cap acpi_cpufreq nf_conntrack_netbios_ns microcode fuse iwl3945 iwlcore thinkpad_acpi mac80211 backlight btusb led_class bluetooth thermal ac battery processor button nsc_ircc irda crc_ccitt cfg80211 rfkill e1000e uinput [last unloaded: usbserial]
[ 1658.281297] Pid: 9, comm: events/0 Tainted: G W 2.6.31-rc8-gkh-00038-g37d0892-dirty #33
[ 1658.281302] Call Trace:
[ 1658.281314] [<ffffffffa01ca7b8>] ? serial_write+0x77/0x9d [usbserial]
[ 1658.281323] [<ffffffff81041d0d>] warn_slowpath_common+0x7c/0xa9
[ 1658.281332] [<ffffffff81041d4e>] warn_slowpath_null+0x14/0x16
[ 1658.281344] [<ffffffffa01ca7b8>] serial_write+0x77/0x9d [usbserial]
[ 1658.281352] [<ffffffff811bc4b9>] tty_put_char+0x32/0x34
[ 1658.281359] [<ffffffff811bff21>] do_output_char+0xc0/0x201
[ 1658.281367] [<ffffffff811c0294>] process_echoes+0x1dc/0x289
[ 1658.281375] [<ffffffff811c2078>] n_tty_receive_buf+0xa28/0xebd
[ 1658.281384] [<ffffffff81067ed8>] ? mark_held_locks+0x4d/0x6b
[ 1658.281393] [<ffffffff8131fa88>] ? _spin_unlock_irqrestore+0x44/0x72
[ 1658.281402] [<ffffffff8106814b>] ? trace_hardirqs_on_caller+0x10b/0x12f
[ 1658.281410] [<ffffffff811c47ef>] flush_to_ldisc+0x12f/0x1d7
[ 1658.281419] [<ffffffff810542f7>] worker_thread+0x234/0x350
[ 1658.281426] [<ffffffff810542a0>] ? worker_thread+0x1dd/0x350
[ 1658.281434] [<ffffffff811c46c0>] ? flush_to_ldisc+0x0/0x1d7
[ 1658.281442] [<ffffffff81059226>] ? autoremove_wake_function+0x0/0x3d
[ 1658.281450] [<ffffffff8106817c>] ? trace_hardirqs_on+0xd/0xf
[ 1658.281458] [<ffffffff810540c3>] ? worker_thread+0x0/0x350
[ 1658.281465] [<ffffffff81058e34>] kthread+0x94/0x9c
[ 1658.281473] [<ffffffff8100c29a>] child_rip+0xa/0x20
[ 1658.281481] [<ffffffff8100bc00>] ? restore_args+0x0/0x30
[ 1658.281488] [<ffffffff81058da0>] ? kthread+0x0/0x9c
[ 1658.281495] [<ffffffff8100c290>] ? child_rip+0x0/0x20
[ 1658.281499] ---[ end trace 644f4c2ff2fe5981 ]---
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