Re: [patch 2/8] isdn/capi: replace interruptible_sleep_on() with wait_event_interruptible()

[Andrew Morton <akpm@osdl.org>]

domen@coderock.org wrote:
>
> 
> 
> Use wait_event_interruptible() instead of the deprecated
> interruptible_sleep_on(). Patch is straight-forward as current sleep is
> conditionally looped. Patch is compile-tested.
> 
> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
> Signed-off-by: Domen Puncer <domen@coderock.org>
> ---
> 
> 
>  kj-domen/drivers/isdn/capi/capi.c |    9 ++-------
>  1 files changed, 2 insertions(+), 7 deletions(-)
> 
> diff -puN drivers/isdn/capi/capi.c~int_sleep_on-drivers_isdn_capi_capi drivers/isdn/capi/capi.c
> --- kj/drivers/isdn/capi/capi.c~int_sleep_on-drivers_isdn_capi_capi	2005-03-05 16:11:36.000000000 +0100
> +++ kj-domen/drivers/isdn/capi/capi.c	2005-03-05 16:11:36.000000000 +0100
> @@ -675,13 +675,8 @@ capi_read(struct file *file, char __user
>  		if (file->f_flags & O_NONBLOCK)
>  			return -EAGAIN;
>  
> -		for (;;) {
> -			interruptible_sleep_on(&cdev->recvwait);
> -			if ((skb = skb_dequeue(&cdev->recvqueue)) != 0)
> -				break;
> -			if (signal_pending(current))
> -				break;
> -		}
> +		wait_event_interruptible(cdev->recvwait,
> +				((skb = skb_dequeue(&cdev->recvqueue)) == 0));
>  		if (skb == 0)
>  			return -ERESTARTNOHAND;
>  	}

hmm, OK.  Putting an expression with side-effect such as this into a macro
which evaluates the expression multiple times is a bit of a worry, but it
appears that everything will work OK.

That being said, I'd prefer that this come in via the ISDN team, after
having been tested please.