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Date:	Sun, 7 Sep 2008 18:00:08 -0400
From:	Shane <>
Subject: warn_on_slowpath at drivers/usb/serial/usb-serial.c:311

Got several of these messages when I plugged in a usb gps unit. The
gps unit worked fine.

Also, the gspca driver works for my web cams now. Very nice to have
that in the kernel. Thanks to all those who worked on it!

Longer log attached.

usb 6-2: pl2303 converter now attached to ttyUSB0
usbcore: registered new interface driver pl2303
pl2303: Prolific PL2303 USB to serial adaptor driver
------------[ cut here ]------------
WARNING: at drivers/usb/serial/usb-serial.c:311 serial_write+0x9c/0xa0
Modules linked in: pl2303 usbserial gspca_spca561 gspca_main
acpi_cpufreq nfsd auth_rpcgss exportfs kvm_intel kvm nfs lockd sunrpc
twofish twofish_common serpent blowfish aes_i586 aes_generic xcbc
sha256_generic crypto_null af_key dm_snapshot dm_mirror dm_log
coretemp w83627ehf hwmon_vid sg joydev usbhid snd_hda_intel
snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd pata_jmicron ata_piix
i2c_i801 ahci ehci_hcd soundcore r8169 uhci_hcd snd_page_alloc usbcore
[last unloaded: pcspkr]
Pid: 7, comm: events/0 Not tainted 2.6.27-rc5.1-00341-gf98ef8e-dirty #1
[<40125e74>] warn_on_slowpath+0x54/0x70
[<4011a787>] ? hrtick_start_fair+0x1a7/0x1b0
[<4011bea3>] ? enqueue_task_fair+0x33/0x2c0
[<401236f6>] ? check_preempt_wakeup+0x106/0x180
[<4020adf9>] ? rb_insert_color+0x99/0xc0
[<4013b5d5>] ? enqueue_hrtimer+0x75/0x100
[<c0a9d43c>] serial_write+0x9c/0xa0 [usbserial]
[<4013bcbe>] ? hrtimer_start+0xae/0x130
[<4024fddb>] tty_put_char+0x2b/0x40
[<4011a75e>] ? hrtick_start_fair+0x17e/0x1b0
[<40253f59>] echo_char+0x49/0x70
[<40254c5f>] n_tty_receive_buf+0x6cf/0x1180
[<40207025>] ? __next_cpu+0x15/0x30
[<4011c664>] ? find_busiest_group+0x134/0x6d0
[<4011934d>] ? update_curr+0x8d/0xc0
[<4011a36a>] ? __dequeue_entity+0x2a/0xa0
[<401228e4>] ? dequeue_task_fair+0xa4/0x110
[<40256eb5>] ? tty_ldisc_try+0x35/0x50
[<4025086d>] flush_to_ldisc+0xdd/0x190
[<40254590>] ? n_tty_receive_buf+0x0/0x1180
[<40250790>] ? flush_to_ldisc+0x0/0x190
[<401352f7>] run_workqueue+0x77/0x100
[<40138a43>] ? prepare_to_wait+0x53/0x60
[<40135c89>] worker_thread+0x99/0xf0
[<40138870>] ? autoremove_wake_function+0x0/0x50
[<40135bf0>] ? worker_thread+0x0/0xf0
[<40138572>] kthread+0x42/0x70
[<40138530>] ? kthread+0x0/0x70
[<40103d63>] kernel_thread_helper+0x7/0x14
---[ end trace 68b706884af5ac09 ]---

View attachment "2.6.27-rc5.1-00341-gf98ef8e-dirty_usb_serial_warn.txt" of type "text/plain" (7507 bytes)

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