Messages in this thread | | | Date | Wed, 02 Jan 2002 19:13:35 -0500 | From | Roger Leblanc <> | Subject | Re: Deadlock in kernel on USB shutdown |
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----- Original Message ----- From: "Greg KH" <greg@kroah.com> To: "Roger Leblanc" <r_leblanc@videotron.ca> Cc: <linux-kernel@vger.kernel.org> Sent: Wednesday, January 02, 2002 9:40 AM Subject: Re: Deadlock in kernel on USB shutdown
>> On Tue, Jan 01, 2002 at 04:48:41PM -0500, Roger Leblanc wrote: > >>> > Hi, >>> > >>> > I just compiled version 2.4.17 of the Linux kernel for my Pentium III. >>> > It is compiled with modular USB support so I can run my USB scanner (an >>> > Epson Perfection 1200U). >>> > >>> > The scanner works fine but the system freeses when I shut it down. I >>> > investigated a bit and found that in the file: >>> > <kernel_root>/drivers/usb/usb.c >>> > in function: >>> > usb_disconnect(struct usb_device **pdev) >>> > >>> > there is a call to function: >>> > usbdevfs_remove_device(dev) >>> > at line 2423. >>> > >>> > That is the exact point where it freeses. If I comment out that line, >>> > everything goes fine. I know! This is not the proper way to fix it! But >>> > at least, it fixes my problem. Since I'm not a kernel expert, I will >>> > leave it to you to find the right way to fix it. >> >> >> Does the system lock up when you unload the usbcore module by hand >> without shutting the system down? >> >> Are your init scripts unmounting the usbdevfs filesystem properly before >> trying to unload the usbcore module? > It doesn't get that far. The first thing my init script (or Mandrake 8.1 script) does at shutdown is to run modprobe -r on modules usb-ohci, usb-uhci and uhci. The system freeses when it gets to usb-uhci. It does it also if I run these commands on the command line.
Thanks
Roger
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