linux-kernel - Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver

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Message-ID: <51771F66.3080801@hp.com>
Date:	Wed, 24 Apr 2013 07:55:18 +0800
From:	ZhenHua <zhen-hual@...com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	stern@...land.harvard.edu, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, tom.vaden@...com
Subject: Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver

On 04/23/2013 10:07 PM, Greg KH wrote:
> On Tue, Apr 23, 2013 at 03:15:01PM +0800, Li, Zhen-Hua wrote:
>> From: "Li, Zhen-Hua" <zhen-hual@...com>
>>
>> This patch is trying to fix bug QXCR1001261767.
Sorry for the bug number. Please ignore this line.

> What is that bug number?  Where can it be referenced?  If you are going
> to put it in a public place (like a kernel changelog), it needs to be
> publicly accessible.
>
>> On some HP platform, when usb driver inits the iLo Virtual USB Controller, there may be a warning "Controller not stopped yet!". It is because driver does not wait enough time.
> What happened to your line endings?
>
>> This patch adds more time waiting and retries.
> Why not only do this for your device?
>
>> Signed-off-by: Li, Zhen-Hua <zhen-hual@...com>
>> ---
>>   drivers/usb/host/uhci-hcd.c |   16 +++++++++++++++-
>>   1 file changed, 15 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
>> index 4a86b63..514e9d7 100644
>> --- a/drivers/usb/host/uhci-hcd.c
>> +++ b/drivers/usb/host/uhci-hcd.c
>> @@ -277,6 +277,9 @@ static int global_suspend_mode_is_broken(struct uhci_hcd *uhci)
>>   		uhci->global_suspend_mode_is_broken(uhci) : 0;
>>   }
>>   
>> +#define UHCI_SUSPENDRH_RETRY_MAX      10
>> +#define UHCI_SUSPENDRH_RETRY_DELAY    100
>> +
>>   static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
>>   __releases(uhci->lock)
>>   __acquires(uhci->lock)
>> @@ -284,6 +287,7 @@ __acquires(uhci->lock)
>>   	int auto_stop;
>>   	int int_enable, egsm_enable, wakeup_enable;
>>   	struct usb_device *rhdev = uhci_to_hcd(uhci)->self.root_hub;
>> +	u16 try, stopped;
>>   
>>   	auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
>>   	dev_dbg(&rhdev->dev, "%s%s\n", __func__,
>> @@ -355,7 +359,17 @@ __acquires(uhci->lock)
>>   		if (uhci->dead)
>>   			return;
>>   	}
>> -	if (!(uhci_readw(uhci, USBSTS) & USBSTS_HCH))
>> +
>> +	for (try = 0; try < UHCI_SUSPENDRH_RETRY_MAX; try++) {
>> +		/*
>> +		 * Sometimes we may need to wait more time and try again.
>> +		 */
> "Sometimes"?  Please be more specific.  Also, a multi-line comment isn't
> needed, make it one line please.
>
> thanks,
>
> greg k-h

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