linux-kernel - Re: [PATCH v2] usb: dwc2: Register interrupt handler only once gadget is correctly initialized

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Message-ID: <54DD65B9.8060806@synopsys.com>
Date:	Thu, 12 Feb 2015 18:47:21 -0800
From:	John Youn <John.Youn@...opsys.com>
To:	Romain Perier <romain.perier@...il.com>,
	"John.Youn@...opsys.com" <John.Youn@...opsys.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [PATCH v2] usb: dwc2: Register interrupt handler only once gadget
 is correctly initialized

On 2/12/2015 4:42 AM, Romain Perier wrote:
> ping
> 
> 2015-02-06 17:50 GMT+01:00 Romain Perier <romain.perier@...il.com>:
>> Don't register interrupt handler before usb gadget is correctly initialized.
>> For some embedded platforms which don't have a usb-phy, it crashes the driver
>> because an interrupt is emitted with non-initialized hardware.
>> According to devm_request_irq documentation, an interrupt can be emitted
>> at any time once the interrupt is registered, so we have to care about driver
>> and hardware initialization.
>>
>> Signed-off-by: Romain Perier <romain.perier@...il.com>
>> ---
>>
>> Changes for v2: fix typos in commit log
>>
>>  drivers/usb/dwc2/platform.c | 17 +++++++++--------
>>  1 file changed, 9 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
>> index ae095f0..b26cf8c 100644
>> --- a/drivers/usb/dwc2/platform.c
>> +++ b/drivers/usb/dwc2/platform.c
>> @@ -196,14 +196,6 @@ static int dwc2_driver_probe(struct platform_device *dev)
>>                 return irq;
>>         }
>>
>> -       dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
>> -               irq);
>> -       retval = devm_request_irq(hsotg->dev, irq,
>> -                                 dwc2_handle_common_intr, IRQF_SHARED,
>> -                                 dev_name(hsotg->dev), hsotg);
>> -       if (retval)
>> -               return retval;
>> -
>>         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
>>         hsotg->regs = devm_ioremap_resource(&dev->dev, res);
>>         if (IS_ERR(hsotg->regs))
>> @@ -237,6 +229,15 @@ static int dwc2_driver_probe(struct platform_device *dev)
>>         retval = dwc2_gadget_init(hsotg, irq);
>>         if (retval)
>>                 return retval;
>> +
>> +        dev_dbg(hsotg->dev, "registering common handler for irq%d\n",
>> +                irq);
>> +        retval = devm_request_irq(hsotg->dev, irq,
>> +                                dwc2_handle_common_intr, IRQF_SHARED,
>> +                                dev_name(hsotg->dev), hsotg);
>> +        if (retval)
>> +                return retval;
>> +
>>         retval = dwc2_hcd_init(hsotg, irq, params);
>>         if (retval)
>>                 return retval;

Hi,

I'm going to be away until Wednesday, Feb 18. I'll take a look at
this and other pending dwc2 patches at that time.

Regards,
John


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