linux-kernel - Re: [Alsa-devel] [2.6 patch] sound/core/control.c: remove dead code

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Date:	Tue, 07 Nov 2006 11:43:48 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	perex@...e.cz, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Alsa-devel] [2.6 patch] sound/core/control.c: remove dead code

At Mon, 6 Nov 2006 19:30:18 +0100,
Adrian Bunk wrote:
> 
> This patch removes some obviously dead code spotted by the Coverity 
> checker.
> 
> Signed-off-by: Adrian Bunk <bunk@...sta.de>

I think it's a wrong fix.  result could be > 0 indeed.


Takashi

> 
> --- linux-2.6/sound/core/control.c.old	2006-11-06 19:11:32.000000000 +0100
> +++ linux-2.6/sound/core/control.c	2006-11-06 19:11:52.000000000 +0100
> @@ -1267,23 +1267,23 @@ static ssize_t snd_ctl_read(struct file 
>  			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
>  				err = -EAGAIN;
>  				goto __end_lock;
>  			}
>  			init_waitqueue_entry(&wait, current);
>  			add_wait_queue(&ctl->change_sleep, &wait);
>  			set_current_state(TASK_INTERRUPTIBLE);
>  			spin_unlock_irq(&ctl->read_lock);
>  			schedule();
>  			remove_wait_queue(&ctl->change_sleep, &wait);
>  			if (signal_pending(current))
> -				return result > 0 ? result : -ERESTARTSYS;
> +				return -ERESTARTSYS;
>  			spin_lock_irq(&ctl->read_lock);
>  		}
>  		kev = snd_kctl_event(ctl->events.next);
>  		ev.type = SNDRV_CTL_EVENT_ELEM;
>  		ev.data.elem.mask = kev->mask;
>  		ev.data.elem.id = kev->id;
>  		list_del(&kev->list);
>  		spin_unlock_irq(&ctl->read_lock);
>  		kfree(kev);
>  		if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) {
>  			err = -EFAULT;
> 
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