linux-kernel - Re: [PATCH 2/4] usb: dwc3: dwc3-omap: return -EPROBE

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Message-ID: <513608E6.3010502@ti.com>
Date:	Tue, 5 Mar 2013 20:31:58 +0530
From:	kishon <kishon@...com>
To:	<balbi@...com>
CC:	<grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
	<rob@...dley.net>, <gregkh@...uxfoundation.org>,
	<s-guiriec@...com>, <gg@...mlogic.co.uk>, <sameo@...ux.intel.com>,
	<broonie@...nsource.wolfsonmicro.com>, <ldewangan@...dia.com>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH 2/4] usb: dwc3: dwc3-omap: return -EPROBE_DEFER if probe
 has not yet executed

Hi,

On Tuesday 05 March 2013 08:26 PM, Felipe Balbi wrote:
> On Tue, Mar 05, 2013 at 07:51:58PM +0530, Kishon Vijay Abraham I wrote:
>> return -EPROBE_DEFER from dwc3_omap_mailbox in dwc3-omap.c, if the probe of
>> dwc3-omap has not yet been executed or failed.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>   drivers/usb/dwc3/dwc3-omap.c  |    7 +++++--
>>   include/linux/usb/dwc3-omap.h |    6 +++---
>>   2 files changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
>> index 19c6e72..9428f4e 100644
>> --- a/drivers/usb/dwc3/dwc3-omap.c
>> +++ b/drivers/usb/dwc3/dwc3-omap.c
>> @@ -138,11 +138,14 @@ static inline void dwc3_omap_writel(void __iomem *base, u32 offset, u32 value)
>>   	writel(value, base + offset);
>>   }
>>
>> -void dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status)
>> +int dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status)
>>   {
>>   	u32			val;
>>   	struct dwc3_omap	*omap = _omap;
>>
>> +	if (!omap)
>> +		return -EPROBE_DEFER;
>> +
>>   	switch (status) {
>>   	case OMAP_DWC3_ID_GROUND:
>>   		dev_dbg(omap->dev, "ID GND\n");
>> @@ -185,7 +188,7 @@ void dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status)
>>   		dev_dbg(omap->dev, "ID float\n");
>>   	}
>>
>> -	return;
>> +	return IRQ_HANDLED;
>
> IRQ_HANDLED ????

Actually I did it that way since palmas_vbus_wakeup_irq can directly 
return the return value from dwc3_omap_mailbox. If this seems hacky to 
you, I'll change it.

Thanks
Kishon
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