linux-kernel - Re: [PATCH] kernel/locking/locktorture: fix deadlock in 'rw_lock

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Message-ID: <20150307003742.GH5236@linux.vnet.ibm.com>
Date:	Fri, 6 Mar 2015 16:37:42 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Alexey Kodanev <alexey.kodanev@...cle.com>
Cc:	josh@...htriplett.org, linux-kernel@...r.kernel.org,
	vasily.isaenko@...cle.com, dave@...olabs.net
Subject: Re: [PATCH] kernel/locking/locktorture: fix deadlock in
 'rw_lock_irq' type

On Sat, Mar 07, 2015 at 03:06:53AM +0300, Alexey Kodanev wrote:
> torture_rwlock_read_unlock_irq() must use read_unlock_irqrestore()
> instead of write_unlock_irqrestore().
> 
> Use read_unlock_irqrestore() instead of write_unlock_irqrestore().
> 
> Signed-off-by: Alexey Kodanev <alexey.kodanev@...cle.com>

Good catch!  If Davidlohr has no objections, I will queue this one.

							Thanx, Paul

> ---
>  kernel/locking/locktorture.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
> index ec8cce2..6a2723c 100644
> --- a/kernel/locking/locktorture.c
> +++ b/kernel/locking/locktorture.c
> @@ -309,7 +309,7 @@ static int torture_rwlock_read_lock_irq(void) __acquires(torture_rwlock)
>  static void torture_rwlock_read_unlock_irq(void)
>  __releases(torture_rwlock)
>  {
> -	write_unlock_irqrestore(&torture_rwlock, cxt.cur_ops->flags);
> +	read_unlock_irqrestore(&torture_rwlock, cxt.cur_ops->flags);
>  }
> 
>  static struct lock_torture_ops rw_lock_irq_ops = {
> -- 
> 1.7.1
> 

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