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Date: Sun, 25 Jan 2004 17:57:23 +0000
From: viro@parcelfarce.linux.theplanet.co.uk
To: Jan Ischebeck <mail@jan-ischebeck.de>
Cc: Andrew Morton <akpm@osdl.org>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.2-rc1-mm2: sleep_on_timeout with parport
Message-ID: <20040125175723.GQ21151@parcelfarce.linux.theplanet.co.uk>
References: <1074870538.5122.9.camel@JHome.uni-bonn.de> <20040123103959.4dcf5b58.akpm@osdl.org> <1075046073.26778.3.camel@JHome.uni-bonn.de>
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On Sun, Jan 25, 2004 at 04:55:01PM +0100, Jan Ischebeck wrote:
> Trying to print without switching the printer on I got the following
> error messages.
> 
> lp0 out of paper
> Badness in interruptible_sleep_on_timeout at kernel/sched.c:2245
> Call Trace:
>  [<c0121a6f>] interruptible_sleep_on_timeout+0x10f/0x120
>  [<c0121500>] default_wake_function+0x0/0x20
>  [<e0a34e5f>] parport_release+0x7f/0x140 [parport]

Yeah...  parport locking primitives (and, frankly, the rest of parport
API) apparently had been designed on serious drugs.

I'm cleaning up that crap; some patches are already in -mm, more will
follow.  In particular, yes, parprt_claim()/parport_claim_or_block()/
parport_release() is racy and most of the users have problems with
missing wakeups.
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