linux-kernel - Re: [PATCH] gfs2/locking/dlm: use an temp variable to reduce a spin

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Date:	Wed, 25 Jul 2007 15:09:36 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Denis Cheng <crquan@...il.com>
Cc:	cluster-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gfs2/locking/dlm: use an temp variable to reduce a
	spin_unlock

Hi,

Now applied to the GFS2 -nmw git tree. Thanks,

Steve.

On Wed, 2007-07-25 at 17:53 +0800, Denis Cheng wrote:
> this is more clear.
> 
> Signed-off-by: Denis Cheng <crquan@...il.com>
> ---
>  fs/gfs2/locking/dlm/plock.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/gfs2/locking/dlm/plock.c b/fs/gfs2/locking/dlm/plock.c
> index fba1f1d..1f7b038 100644
> --- a/fs/gfs2/locking/dlm/plock.c
> +++ b/fs/gfs2/locking/dlm/plock.c
> @@ -346,15 +346,16 @@ static ssize_t dev_write(struct file *file, const char __user *u, size_t count,
>  
>  static unsigned int dev_poll(struct file *file, poll_table *wait)
>  {
> +	unsigned int mask = 0;
> +
>  	poll_wait(file, &send_wq, wait);
>  
>  	spin_lock(&ops_lock);
> -	if (!list_empty(&send_list)) {
> -		spin_unlock(&ops_lock);
> -		return POLLIN | POLLRDNORM;
> -	}
> +	if (!list_empty(&send_list))
> +		mask = POLLIN | POLLRDNORM;
>  	spin_unlock(&ops_lock);
> -	return 0;
> +
> +	return mask;
>  }
>  
>  static const struct file_operations dev_fops = {

-
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