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List: linux-omap
Subject: Re: [PATCH] net/smsc911x: Fix deferred probe for interrupt
From: Sergei Shtylyov <sergei.shtylyov () cogentembedded ! com>
Date: 2015-08-31 17:05:02
Message-ID: 55E4893E.2010309 () cogentembedded ! com
[Download RAW message or body]
Hello.
On 08/31/2015 05:03 PM, Grygorii Strashko 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@shawell.net>
>>> Signed-off-by: Tony Lindgren <tony@atomide.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).
> Have you paid some attention on current platform_get_irq_() implementation?
> The platform_get_irq() can return 0 in case of DT-boot.
This is what's indeed worth filtering out and converting to -ENODEV. ;-)
But my patches just ignored this possibility. I'm not at all fond of Linus'
idea about IRQ0 being invalid, BTW...
WBR, Sergei
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