On Tue, 7 Jul 2009, Carlos R. Mafra wrote: > I was looking at the 'dmesg' output for 2.6.31-rc2 and noticed > this warning > > ------------[ cut here ]------------ > WARNING: at drivers/usb/host/ehci-hcd.c:1048 ehci_endpoint_reset+0xfc/0x140 [ehci_hcd]() > Hardware name: VGN-FZ240E > clear_halt for a busy endpoint > Modules linked in: usbhid nvram dvb_usb_dib0700 dib7000p dib7000m dvb_usb dib3000mc dibx000_common dib0070 option usb_storage usbserial uvc video snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm iwlagn ehci_hcd sky2 snd_timer uhci_hcd i2c_i801 evdev snd_page_alloc sg sr_mod ata_piix ahci libata sd_mod scsi_mod > Pid: 5043, comm: comgt Not tainted 2.6.31-rc2 #109 > Call Trace: > [<ffffffffa00d2b6c>] ? ehci_endpoint_reset+0xfc/0x140 [ehci_hcd] > [<ffffffff8103f2b8>] warn_slowpath_common+0x78/0xd0 > [<ffffffff8103f394>] warn_slowpath_fmt+0x64/0x70 > [<ffffffff81264bd5>] ? usb_free_urb+0x15/0x20 > [<ffffffff812660d7>] ? usb_start_wait_urb+0x97/0xe0 > [<ffffffffa00d2b6c>] ehci_endpoint_reset+0xfc/0x140 [ehci_hcd] > [<ffffffff81261fed>] usb_hcd_reset_endpoint+0x1d/0x70 > [<ffffffff812653f2>] usb_reset_endpoint+0x22/0x40 > [<ffffffff81266556>] usb_clear_halt+0x66/0x80 > [<ffffffffa0199d1c>] option_open+0xcc/0x180 [option] > [<ffffffffa0177986>] serial_open+0x176/0x240 [usbserial] > [<ffffffff811bd81a>] tty_open+0x1fa/0x530 > [<ffffffff810ac755>] chrdev_open+0xf5/0x1a0 > [<ffffffff810ac660>] ? chrdev_open+0x0/0x1a0 > [<ffffffff810a77c5>] __dentry_open+0xd5/0x2f0 > [<ffffffff810a7ae7>] nameidata_to_filp+0x57/0x70 > [<ffffffff810b68ba>] do_filp_open+0x71a/0xb10 > [<ffffffff810c06ea>] ? alloc_fd+0x4a/0x140 > [<ffffffff810a75df>] do_sys_open+0x7f/0x140 > [<ffffffff810a76cb>] sys_open+0x1b/0x20 > [<ffffffff8100bdab>] system_call_fastpath+0x16/0x1b > ---[ end trace f21382a71ff3302a ]--- > > > However I can still use a USB pendrive and everything seems to be fine. This is definitely a bug in the option driver. If you remove the call to usb_clear_halt() in drivers/usb/serial/option.c:option_open(), does the warning go away and does everything continue to work okay? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
