From: Ingo Molnar <mingo@elte.hu>
To: Andrew Morton <akpm@osdl.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
linux-kernel@vger.kernel.org, greg@kroah.com, zaitcev@redhat.com
Subject: Re: 2.6.15-mm4: sem2mutex problem in USB OHCI
Date: Mon, 16 Jan 2006 09:21:59 +0100 [thread overview]
Message-ID: <20060116082159.GA9744@elte.hu> (raw)
In-Reply-To: <20060114160526.228da734.akpm@osdl.org>
* Andrew Morton <akpm@osdl.org> wrote:
> > Badness in __mutex_trylock_slowpath at kernel/mutex.c:281
> >
> > Call Trace: <IRQ> <ffffffff80148d8d>{mutex_trylock+141}
> >
> > <ffffffff880abaf0>{:ohci_hcd:ohci_hub_status_data+480}
> > <ffffffff802d25d0>{rh_timer_func+0} <ffffffff802d24c3>{usb_hcd_poll_rh_status+67}
> > <ffffffff802d25d0>{rh_timer_func+0} <ffffffff802d25d9>{rh_timer_func+9}
> > <ffffffff8013a3cc>{run_timer_softirq+396}
> err, taking a mutex from softirq context.
btw., i'm wondering how the down_trylock() can be correct code: what
guarantees progress if the trylock happens to fail all the time? (or
just happens to fail frequently, due to some other, unrelated dev->mutex
workload)
Shouldnt this code use some other solution to process these timed events
more robustly?
Ingo
prev parent reply other threads:[~2006-01-16 8:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-14 23:58 2.6.15-mm4: sem2mutex problem in USB OHCI Rafael J. Wysocki
2006-01-15 0:05 ` Andrew Morton
2006-01-15 4:38 ` Ingo Molnar
2006-01-15 15:31 ` Rafael J. Wysocki
2006-01-16 22:51 ` Greg KH
2006-01-16 8:21 ` Ingo Molnar [this message]
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