linux-kernel - Re: Linux 3.0 oopses when pulling a USB CDROM

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Message-ID: <20110702181501.GN23059@one.firstfloor.org>
Date:	Sat, 2 Jul 2011 20:15:01 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Dave Jones <davej@...hat.com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, axboe@...nel.dk, rjw@...k.pl,
	linux-usb@...r.kernel.org
Subject: Re: Linux 3.0 oopses when pulling a USB CDROM

> And the transition after unplug goes
> 
> 13->12->10->8->7->6->5->3
> 
> implying we're missing put events.

Don't know why. I used this check (with trace_scsi_dev containing the name)
in put_device:

if (trace_scsi && dev->type == &scsi_dev_type &&
     trace_scsi_dev[0] == 0 || !strcmp(dev_name(dev), trace_scsi_dev))) {
	dev_printk ...

If you want instrumentation somewhere else please let me know.

Maybe there simply isn't a put_device to 0 and the NULL pointer happens
for some other reason?

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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