linux-kernel - Re: [PATCH 02/43] drivers/net/e2100.c: fix sparse warning: symbol shadows an earlier one

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Message-ID: <499820DF.5070508@bfs.de>
Date:	Sun, 15 Feb 2009 15:04:15 +0100
From:	walter harms <wharms@....de>
To:	Hannes Eder <hannes@...neseder.net>
Cc:	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/43] drivers/net/e2100.c: fix sparse warning: symbol
 shadows	an earlier one

Hi Hannes,
it is ok to replace a fixed boarder with ARRAY_SIZE()
in this special case i would success the following additional cleanup
(untestet !!)


static int set_free_irq(struct net_device *dev)
{
 int irqlist[] = {15,11,10,12,5,9,3,4}, i;

        for (i = 0; i < ARRAY_SIZE(irqlist); i++)
           if (request_irq (irqlist[i], NULL, 0, "bogus", NULL) != -EBUSY) {
                        dev->irq = irqlist[i];
                        return 0;
            }
        return -1;
}

....

if (dev->irq < 2) {
         if ( set_free_irq(dev) < 0) {
                printk(" unable to get IRQ %d.\n", dev->irq);
                retval = -EAGAIN;
                goto out;
        }

for me this looks more readable.

getting a free interrupt from a list mus be a common problem ? I am not in driver programming
perhaps such a code is already in place somewhere  ?

comments ?

re,
 wh


Hannes Eder schrieb:
> Impact: Remove redundant inner scope variable and while being at it
> make use of ARRAY_SIZE instead of a hardcoded number.
> 
> Fix this sparse warning:
>   drivers/net/e2100.c:219:56: warning: symbol 'i' shadows an earlier one
>   drivers/net/e2100.c:181:13: originally declared here
> 
> Signed-off-by: Hannes Eder <hannes@...neseder.net>
> ---
>  drivers/net/e2100.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/e2100.c b/drivers/net/e2100.c
> index b07ba19..d2f6ee1 100644
> --- a/drivers/net/e2100.c
> +++ b/drivers/net/e2100.c
> @@ -216,13 +216,13 @@ static int __init e21_probe1(struct net_device *dev, int ioaddr)
>  		printk(" %02X", station_addr[i]);
>  
>  	if (dev->irq < 2) {
> -		int irqlist[] = {15,11,10,12,5,9,3,4}, i;
> -		for (i = 0; i < 8; i++)
> +		int irqlist[] = {15, 11, 10, 12, 5, 9, 3, 4};
> +		for (i = 0; i < ARRAY_SIZE(irqlist); i++)
>  			if (request_irq (irqlist[i], NULL, 0, "bogus", NULL) != -EBUSY) {
>  				dev->irq = irqlist[i];
>  				break;
>  			}
> -		if (i >= 8) {
> +		if (i >= ARRAY_SIZE(irqlist)) {
>  			printk(" unable to get IRQ %d.\n", dev->irq);
>  			retval = -EAGAIN;
>  			goto out;
> 
> --
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> 
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