From: Oliver Neukum <oneukum@suse.de>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Josh Boyer <jwboyer@redhat.com>,
Alan Stern <stern@rowland.harvard.edu>,
gregkh@linuxfoundation.org, mdharm-usb@one-eyed-alien.net,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: USB autosuspend vs. URB submission
Date: Thu, 10 Jan 2013 10:42:37 +0100 [thread overview]
Message-ID: <1643419.R9VmOAX4j3@linux-5eaq.site> (raw)
In-Reply-To: <2664900.viczl5BYBS@avalon>
On Thursday 10 January 2013 00:05:55 Laurent Pinchart wrote:
> I've had a quick look at the trace posted at
> https://bugzilla.redhat.com/show_bug.cgi?id=879462 but usbmon only shows URBs
> that are successfully submitted. I'm not sure what useful information I could
> get from the trace.
The test is at the very start of usb_submit_urb()
if (!urb || !urb->complete)
return -EINVAL;
if (urb->hcpriv) {
WARN_ONCE(1, "URB %p submitted while active\n", urb);
return -EBUSY;
}
usbmon will never see such URBs
I suggest that for debugging you change the WARN_ONCE into a WARN and compare
the URB pointers of usbmon and dmesg.
In the long run it is probably a good idea to pass duplicated URBs to usbmon by
a special code path.
Regards
Oliver
next prev parent reply other threads:[~2013-01-10 9:42 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-07 20:42 USB autosuspend vs. URB submission Josh Boyer
2013-01-08 15:51 ` Alan Stern
2013-01-08 16:03 ` Josh Boyer
2013-01-09 23:05 ` Laurent Pinchart
2013-01-10 5:13 ` Ming Lei
2013-01-10 10:02 ` Oliver Neukum
2013-01-10 9:42 ` Oliver Neukum [this message]
2013-01-10 15:20 ` Alan Stern
2013-01-10 15:37 ` Oliver Neukum
2013-01-10 15:13 ` Alan Stern
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