linux-kernel - Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc

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Date:	Fri, 26 Mar 2010 10:30:31 +1100
From:	Anton Blanchard <anton@...ba.org>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, tglx@...utronix.de,
	mingo@...e.hu, a.p.zijlstra@...llo.nl
Subject: Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and
 hvc_remove

 
Hi,

> And this suggests that hvc_kick() is called before hvc_task is
> initialised, ie, before hvc_init() is called.
>
> Does this help?

Looks good, tests OK on my POWER5 box. Thanks!

Tested-by: Anton Blanchard <anton@...ba.org>

> diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
> index ba55bba..50ac983 100644
> --- a/drivers/char/hvc_console.c
> +++ b/drivers/char/hvc_console.c
> @@ -285,6 +285,9 @@ EXPORT_SYMBOL_GPL(hvc_instantiate);
>  /* Wake the sleeping khvcd */
>  void hvc_kick(void)
>  {
> +       if (!hvc_task)
> +               return;
> +
>         hvc_kicked = 1;
>         wake_up_process(hvc_task);
>  }
> 
> 		Amit
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