linux-kernel - Re: cdc-acm driver hangs on poll() call

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Date:	Wed, 22 Apr 2009 12:06:59 +0200
From:	Maróy Ákos <akos@...oy.hu>
To:	Oliver Neukum <oliver@...kum.org>
CC:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: cdc-acm driver hangs on poll() call - 2.6.27, works on 2.6.24

Oliver,

> Does it happen with 2.6.29?
> Could you get dmesg of 2.6.2(7/9) with CONFIG_USB_DEBUG and debug
> activated in drivers/usb/class/cdc-acm.c ?

interesting, the dmesg output is not that talkative:

Apr 22 11:50:37 tomodachi kernel: [  623.236068] usb 2-1: new full speed
USB device using uhci_hcd and address 2
Apr 22 11:50:37 tomodachi kernel: [  623.400102] usb 2-1: New USB device
found, idVendor=ffff, idProduct=0005
Apr 22 11:50:37 tomodachi kernel: [  623.400107] usb 2-1: New USB device
strings: Mfr=1, Product=2, SerialNumber=3
Apr 22 11:50:37 tomodachi kernel: [  623.400111] usb 2-1: Product: USBSerial
Apr 22 11:50:37 tomodachi kernel: [  623.400114] usb 2-1: Manufacturer:
LPCUSB
Apr 22 11:50:37 tomodachi kernel: [  623.400117] usb 2-1: SerialNumber:
DEADC0DE
Apr 22 11:50:37 tomodachi kernel: [  623.400654] usb 2-1: configuration
#1 chosen from 1 choice
Apr 22 11:50:37 tomodachi kernel: [  623.453590] cdc_acm 2-1:1.0:
ttyACM0: USB ACM device
Apr 22 11:50:37 tomodachi kernel: [  623.457094] usbcore: registered new
interface driver cdc_acm
Apr 22 11:50:37 tomodachi kernel: [  623.457100] cdc_acm: v0.26:USB
Abstract Control Model driver for USB modems and ISDN adapters


even though:

$ zcat /proc/config.gz | grep CONFIG_USB_DEBUG
CONFIG_USB_DEBUG=y


maybe it did not recompile the cdc-acm module after I changed the
CONFIG_USB_DEBUG setting in .config? I'll do a clean recompile..


Akos

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