From: Mateusz Berezecki <mateuszb@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: "scheduling while atomic" ?
Date: Tue, 12 Jul 2005 16:08:44 +0200 [thread overview]
Message-ID: <42D3CEEC.90603@gmail.com> (raw)
In-Reply-To: <1121175049.6917.19.camel@localhost.localdomain>
>When you say enable a lock, do you mean that you grabbed a lock? Now if
>you grabbed a spinlock, it is really bad to then call schedule, since a
>another process that will grab that same spinlock will deadlock the CPU
>(on an SMP system). Since you are using locks (I'm also assuming that
>you are using spinlocks) I assume that you will be running this on a
>CONFIG_PREEMPT or SMP system.
>
>So the fix will be to release the lock before calling something that
>will schedule, and regrab it afterwards.
>
>
Sorry for not being too precise. Yes, your assumptions were correct ;-)
I grab a lock using
spin_lock(&ieee->lock);
and release it using
spin_unlock(&ieee->lock);
there is quite a lot of debugging printk's inbetween. Can this be a cause ?
next prev parent reply other threads:[~2005-07-12 14:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-12 13:19 "scheduling while atomic" ? Mateusz Berezecki
2005-07-12 13:30 ` Richard B. Johnson
2005-07-12 13:30 ` Steven Rostedt
2005-07-12 14:08 ` Mateusz Berezecki [this message]
2005-07-12 14:11 ` Steven Rostedt
2005-07-12 14:22 ` Mateusz Berezecki
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