linux-kernel - Re: [PATCH] DWC2: intializes the spin

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Message-ID: <CACh+v5P10mZk5WVZ8Gi09T+nsQ-EsVrpS=T2ZOEjotGS41UP9g@mail.gmail.com>
Date:	Fri, 23 May 2014 09:17:41 +0200
From:	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] DWC2: intializes the spin_lock earlier in the probe

My mistake. It actually comes not from the mainline but from the altera tree.
Sorry for the noise

2014-05-22 20:48 GMT+02:00 Paul Zimmerman <Paul.Zimmerman@...opsys.com>:
>
>> From: Jean-Jacques Hiblot [mailto:jjhiblot@...phandler.com]
>> Sent: Thursday, May 22, 2014 5:10 AM
>>
>> The spinlock hsotg->lock is intialized at the end of the probe. However it
>> may be used from within dwc2_hcd_init(). This patch moves the
>> initialization before the call to dwc2_hcd_init(). This make the locking
>> correctness validator happy.
>>
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
>> ---
>>  drivers/usb/dwc2/platform.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
>> index 37a8ab0..55fb30d 100644
>> --- a/drivers/usb/dwc2/platform.c
>> +++ b/drivers/usb/dwc2/platform.c
>> @@ -156,6 +156,8 @@ static int dwc2_driver_probe(struct platform_device *dev)
>>               params.dma_desc_enable = prop;
>>       }
>>
>> +     spin_lock_init(&hsotg->lock);
>> +
>>       if (IS_ENABLED(CONFIG_USB_DWC2_HOST)) {
>>               retval = dwc2_hcd_init(hsotg, irq, &params);
>>               if (retval)
>> @@ -175,7 +177,6 @@ static int dwc2_driver_probe(struct platform_device *dev)
>>               if (retval)
>>                       return retval;
>>       }
>> -     spin_lock_init(&hsotg->lock);
>>
>>       platform_set_drvdata(dev, hsotg);
>>       return retval;
>> --
>
> Hmm. What tree is this against? platform.c in both Linus' tree and in
> Greg's usb-next tree does not have a call to spin_lock_init().
>
> --
> Paul
>
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