Re: [PATCH] 2.5: ewrk3 cli/sti removal by VDA

[Jeff Garzik <jgarzik@pobox.com>]

Adam Kropelin wrote:

>On Mon, Oct 21, 2002 at 08:36:17PM -0400, Jeff Garzik wrote:
>  
>
>>Adam Kropelin wrote:
>>    
>>
>>>Below is a patch from Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua> 
>>>which
>>>removes cli/sti in the ewrk3 driver. It tests out fine here with SMP & 
>>>preempt.
>>>      
>>>
>>Applied and then cleaned up...  ETHTOOL_PHYS_ID needs to use 
>>schedule_timeout(), and using typeof should be avoided.
>>    
>>
>
>The patch below (against yours) should fix ETHTOOL_PHYS_ID again. Let me
>know if I got it wrong. Was my prior use of
>wait_event_interruptible_tiumeout actually broken or rather
>just a lot more complicated than it needed to be?
>
>I didn't find any use of typeof. If you point me to it I'll fix that up,
>too.
>
>Thanks for bearing with me. I'm climbing the clue-ladder as fast as I
>can... ;)
>
>--Adam
>
>--- linux-2.5.44/drivers/net/ewrk3.c	Mon Oct 21 22:01:01 2002
>+++ linux-2.5.44/drivers/net/ewrk3.c.new	Mon Oct 21 21:58:13 2002
>@@ -1759,23 +1759,18 @@
> 		return 0;
> 	}
> 
>-#ifdef BROKEN
> 	/* Blink LED for identification */
> 	case ETHTOOL_PHYS_ID: {
> 		struct ethtool_value edata;
> 		u_long flags;
>-		long delay, ret;
>+		long ret=0;
> 		u_char cr;
> 		int count;
>-		wait_queue_head_t wait;
>-
>-		init_waitqueue_head(&wait);
> 
> 		if (copy_from_user(&edata, useraddr, sizeof(edata)))
> 			return -EFAULT;
> 
> 		/* Toggle LED 4x per second */
>-		delay = HZ >> 2;
> 		count = edata.data << 2;
> 
> 		spin_lock_irqsave(&lp->hw_lock, flags);
>@@ -1796,24 +1791,21 @@
> 
> 			/* Wait a little while */
> 			spin_unlock_irqrestore(&lp->hw_lock, flags);
>-			ret = delay;
>-			__wait_event_interruptible_timeout(wait, 0, ret);
>+			set_current_state(TASK_INTERRUPTIBLE);
>+			ret = schedule_timeout(HZ>>2);
>  
>


close -- if schedule_timeout() returns greater than zero, that number is 
the remaining jiffies that schedule_timeout _should_ have slept, but did 
not.  Ideally you need to call it in a loop, that decrements a variable 
based on schedule_timeout return code.