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From: Greg KH <greg@kroah.com>
To: linux-kernel@vger.kernel.org,
	"David A. Desrosiers" <desrod@gnu-designs.com>
Cc: linux-usb-devel@lists.sourceforge.net
Subject: Re: USBDEVFS_RESET deadlocks USB bus.
Date: Fri, 4 Jun 2004 12:52:47 -0700	[thread overview]
Message-ID: <20040604195247.GA12688@kroah.com> (raw)
In-Reply-To: <20040604193911.GA3261@babylon.d2dc.net>

On Fri, Jun 04, 2004 at 03:39:11PM -0400, Zephaniah E. Hull wrote:
> Starting at 2.6.7-rc1 or so (that is when we first noticed it) the new
> pilot-link libusb back end started deadlocking the entire USB bus that
> the palm device was on.
> 
> I have finally tracked it down to happening when we make the
> USBDEVFS_RESET ioctl, we never return from it and from that point on the
> bus in question is completely dead, no processing is done, no
> notifications of devices being plugged in or unplugged.
> 
> This is still happening in 2.6.7-rc2-mm1.
> 
> It seems to happen with both the UHCI and OHCI back ends, so it is
> probably above that.
> 
> Given that there were heavy locking changes, I suspect that the case in
> question got screwed up somehow.

This needs to go to the linux-usb-devel list, now CC:

Anyway, can you look at the output of SysRq-T and see where the
processes are hung?

thanks,

greg k-h

  reply	other threads:[~2004-06-04 19:53 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-06-04 19:39 USBDEVFS_RESET deadlocks USB bus Zephaniah E. Hull
2004-06-04 19:52 ` Greg KH [this message]
2004-06-04 20:02   ` Zephaniah E. Hull
2004-06-04 20:05     ` Zephaniah E. Hull
2004-06-04 20:07     ` Greg KH
2004-06-04 20:28       ` David A. Desrosiers
2004-06-04 21:06       ` Zephaniah E. Hull
2004-06-04 20:40     ` [linux-usb-devel] " Duncan Sands
2004-06-04 21:30       ` Zephaniah E. Hull
2004-06-05  7:55         ` Duncan Sands
2004-06-06  6:35           ` Zephaniah E. Hull
2004-06-07  7:05             ` Duncan Sands
2004-06-07 15:43               ` Zephaniah E. Hull
2004-06-07 19:11                 ` Duncan Sands
2004-06-07 23:13                   ` Zephaniah E. Hull
2004-06-08 20:19                     ` Duncan Sands
2004-06-18 20:02                       ` Ian Morgan
2004-06-19 13:48                         ` Duncan Sands
2004-07-02 20:47                       ` Zephaniah E. Hull
2004-07-02 21:11                         ` Alan Stern
2004-07-02 21:52                           ` Zephaniah E. Hull
2004-07-03  8:28                             ` Duncan Sands

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