netdev - Re: [PATCH] net/smsc911x: Fix deferred probe for interrupt

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Date:	Sun, 30 Aug 2015 00:33:52 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Tony Lindgren <tony@...mide.com>,
	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-omap@...r.kernel.org,
	Steve Glendinning <steve.glendinning@...well.net>
Subject: Re: [PATCH] net/smsc911x: Fix deferred probe for interrupt

Hello.

On 8/28/2015 9:50 PM, Tony Lindgren wrote:

> The interrupt handler may not be available when smsc911x probes if the
> interrupt handler is a GPIO controller for example. Let's fix that
> by adding handling for -EPROBE_DEFER.

> Cc: Steve Glendinning <steve.glendinning@...well.net>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>   drivers/net/ethernet/smsc/smsc911x.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c
> index 959aeea..cb9f166f 100644
> --- a/drivers/net/ethernet/smsc/smsc911x.c
> +++ b/drivers/net/ethernet/smsc/smsc911x.c
> @@ -2435,7 +2435,10 @@ static int smsc911x_drv_probe(struct platform_device *pdev)
>   	res_size = resource_size(res);
>
>   	irq = platform_get_irq(pdev, 0);
> -	if (irq <= 0) {
> +	if (irq == -EPROBE_DEFER) {
> +		retval = -EPROBE_DEFER;
> +		goto out_0;
> +	} else if (irq <= 0) {
>   		pr_warn("Could not allocate irq resource\n");
>   		retval = -ENODEV;

    I'd propagate the error code from platfrom_get_irq() instead (in fact, 
I've submitted a couple of such patches yesterday and they have been already 
merged).

[...]

NBR, Sergei

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