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

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Message-ID: <4BBB28BB.2080102@in.ibm.com>
Date:	Tue, 06 Apr 2010 17:57:39 +0530
From:	Sachin Sant <sachinp@...ibm.com>
To:	Anton Blanchard <anton@...ba.org>
CC:	Amit Shah <amit.shah@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg Kroah-Hartman <gregkh@...e.de>, a.p.zijlstra@...llo.nl,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	tglx@...utronix.de, Linus Torvalds <torvalds@...ux-foundation.org>,
	mingo@...e.hu, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc_remove

Anton Blanchard wrote:
> The patch below changes things to call tty_kref_put once for every
> hvc_close call, and with that my machine boots fine.
>
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> ---
>   
Works for me. Thanks Anton.

Regards
-Sachin

> diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
> index d3890e8..35cca4c 100644
> --- a/drivers/char/hvc_console.c
> +++ b/drivers/char/hvc_console.c
> @@ -368,16 +368,12 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
>  	hp = tty->driver_data;
>
>  	spin_lock_irqsave(&hp->lock, flags);
> -	tty_kref_get(tty);
>
>  	if (--hp->count == 0) {
>  		/* We are done with the tty pointer now. */
>  		hp->tty = NULL;
>  		spin_unlock_irqrestore(&hp->lock, flags);
>
> -		/* Put the ref obtained in hvc_open() */
> -		tty_kref_put(tty);
> -
>  		if (hp->ops->notifier_del)
>  			hp->ops->notifier_del(hp, hp->data);
>
>
>   


-- 

---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------

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