From: Andrew Morton <akpm@osdl.org>
To: Ryan Arnold <rsa@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, linuxppc64-dev@lists.linuxppc.org,
paulus@samba.org, benh@kernel.crashing.org
Subject: Re: [PATCH] interrupt driven hvc_console as vio device
Date: Tue, 24 Aug 2004 21:46:20 -0700 [thread overview]
Message-ID: <20040824214620.769e03de.akpm@osdl.org> (raw)
In-Reply-To: <1093394937.3402.83.camel@localhost>
Ryan Arnold <rsa@us.ibm.com> wrote:
>
> static void hvc_close(struct tty_struct *tty, struct file * filp)
> {
> ...
> + while (hp->n_outbuf) {
> + spin_unlock_irqrestore(&hp->lock, flags);
> + yield();
> + spin_lock_irqsave(&hp->lock, flags);
> + }
ick.
I suspect that if the caller of hvc_close() has realtime scheduling policy,
this locks up. Unless it's waiting for interrupt activity.
Really, a real sleep/wakeup would be tons better.
next prev parent reply other threads:[~2004-08-25 4:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-25 0:48 Ryan Arnold
2004-08-25 4:46 ` Andrew Morton [this message]
2004-08-25 5:09 ` Ryan Arnold
2004-08-25 4:49 ` Andrew Morton
2004-08-25 5:12 ` Ryan Arnold
2004-08-25 4:59 ` Paul Mackerras
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