linux-kernel - Re: [PATCH] usb: ehci-platform: add reset controller number in struct ehci_platform

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Date:	Tue, 26 Apr 2016 09:16:28 +0800
From:	Jiancheng Xue <xuejiancheng@...ilicon.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<yanhaifeng@...ilicon.com>, <yanghongwei@...ilicon.com>,
	<zhangzhenxing@...ilicon.com>, <suwenping@...ilicon.com>,
	<raojun@...ilicon.com>, <ml.yang@...ilicon.com>,
	<gaofei@...ilicon.com>, <hermit.wangheming@...ilicon.com>,
	<jiangheng@...ilicon.com>, <lpc.li@...ilicon.com>
Subject: Re: [PATCH] usb: ehci-platform: add reset controller number in struct
 ehci_platform_priv

Hi Alan,

On 2016/4/25 22:43, Alan Stern wrote:
> On Sat, 23 Apr 2016, Jiancheng Xue wrote:
> 
>> Some generic-ehci compatible controllers have more than one reset signal
>> lines, e.g., Synopsys DWC USB2.0 Host-AHB Controller has two resets bus_reset
>> and roothub_reset. Two more resets are added in this patch in order for this
>> kind of controller to use this driver directly.
>>
>> Signed-off-by: Jiancheng Xue <xuejiancheng@...ilicon.com>
> 
> 
>> +	for (rst = 0; rst < EHCI_MAX_RSTS; rst++) {
>> +		priv->rsts[rst] = of_reset_control_get_by_index(
>> +					dev->dev.of_node, rst);
>> +		if (IS_ERR(priv->rsts[rst])) {
>> +			err = PTR_ERR(priv->rsts[rst]);
>> +			if (err == -EPROBE_DEFER)
>> +				goto err_reset;
>> +			priv->rsts[rst] = NULL;
>> +			break;
>> +		}
>> +
>> +		err = reset_control_deassert(priv->rsts[rst]);
>>  		if (err)
>> -			goto err_put_clks;
>> +			goto err_reset;
> 
> If an error occurs here...
> 
Sorry. It's really a problem. I'll modify it in v2 like below:

err = reset_control_deassert(priv->rsts[rst]);
if(err) {
	reset_control_put(priv->rsts[rst]);
	goto err_reset;
}

>>  	}
>>  
>>  	if (pdata->big_endian_desc)
>> @@ -300,8 +305,10 @@ err_power:
>>  	if (pdata->power_off)
>>  		pdata->power_off(dev);
>>  err_reset:
>> -	if (priv->rst)
>> -		reset_control_assert(priv->rst);
>> +	while (--rst >= 0) {
>> +		reset_control_assert(priv->rsts[rst]);
>> +		reset_control_put(priv->rsts[rst]);
>> +	}
> 
> You won't call reset_control_put() for the offending reset line.
> 
See above.

Is it OK except this bug? If so, I'll send out v2 patch.

Thank you very much!

Regards.
Jiancheng