linux-kernel - Re: [PATCH][next] phy: core: make NULL a valid phy reference if !CONFIG_GENERIC

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Message-ID: <534E56D3.3040907@ti.com>
Date:	Wed, 16 Apr 2014 15:39:23 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>,
	"Balbi, Felipe" <balbi@...com>
CC:	"Strashko, Grygorii" <grygorii.strashko@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH][next] phy: core: make NULL a valid phy reference if !CONFIG_GENERIC_PHY

Hi,

On Thursday 13 March 2014 07:07 PM, Santosh Shilimkar wrote:
> On Thursday 13 March 2014 07:11 PM, Strashko, Grygorii wrote:
>> This fixes a regression on Keystone 2 platforms caused by patch
>> 57303488cd37da58263e842de134dc65f7c626d5
>> "usb: dwc3: adapt dwc3 core to use Generic PHY Framework" which adds
>> optional support of generic phy in DWC3 core.
>>
>> On Keystone 2 platforms the USB is not working now because
>> CONFIG_GENERIC_PHY isn't set and, as result, Generic PHY APIs stubs
>> return -ENOSYS always. The log shows:
>>  dwc3 2690000.dwc3: failed to initialize core
>>  dwc3: probe of 2690000.dwc3 failed with error -38
>>
>> Hence, fix it by making NULL a valid phy reference in Generic PHY
>> APIs stubs in the same way as it was done by the patch
>> 04c2facad8fee66c981a51852806d8923336f362 "drivers: phy: Make NULL
>> a valid phy reference".
>>
>> CC: Kishon Vijay Abraham I <kishon@...com>
>> CC: Felipe Balbi <balbi@...com>
>> CC: Santosh Shilimkar <santosh.shilimkar@...com>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>> ---
> This fixes the regression seen in Linux next and patch seems
> reasonable to me.
> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
> 
> Felipe, Kishon,
> Can you guys pick this fix if you are ok by it. Thanks
> 
> 
>>  include/linux/phy/phy.h |    8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
>> index e2f5ca9..5a9b193 100644
>> --- a/include/linux/phy/phy.h
>> +++ b/include/linux/phy/phy.h
>> @@ -204,21 +204,29 @@ static inline void phy_pm_runtime_forbid(struct phy *phy)
>>  
>>  static inline int phy_init(struct phy *phy)
>>  {
>> +	if (!phy)
>> +		return 0;
>>  	return -ENOSYS;
>>  }
>>  
>>  static inline int phy_exit(struct phy *phy)
>>  {
>> +	if (!phy)
>> +		return 0;
>>  	return -ENOSYS;
>>  }
>>  
>>  static inline int phy_power_on(struct phy *phy)
>>  {
>> +	if (!phy)
>> +		return 0;
>>  	return -ENOSYS;
>>  }
>>  
>>  static inline int phy_power_off(struct phy *phy)
>>  {
>> +	if (!phy)
>> +		return 0;
>>  	return -ENOSYS;
>>  }

Can you add these checks for other stubs in phy.h too?

Thanks
Kishon
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