linux-kernel - Re: [PATCH] usb: dwc3: gadget: remove warning during kernel boot

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Message-ID: <4d62d4d0-3f28-486b-8132-4cc571b6f721@quicinc.com>
Date: Tue, 20 Feb 2024 14:10:32 +0530
From: Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To: Greg KH <gregkh@...uxfoundation.org>, Ray Chi <raychi@...gle.com>
CC: <Thinh.Nguyen@...opsys.com>, <quic_uaggarwa@...cinc.com>,
        <albertccwang@...gle.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc3: gadget: remove warning during kernel boot



On 2/20/2024 2:04 PM, Greg KH wrote:
> On Tue, Feb 20, 2024 at 04:12:04PM +0800, Ray Chi wrote:
>> The dwc3->gadget_driver is not initialized during the dwc3 probe
>> process. This leads to a warning when the runtime power management (PM)
>> attempts to suspend the gadget using dwc3_gadget_suspend().
> 
> What type of warning happens?
> 
>> This patch adds a check to prevent the warning.
>>
>> Cc: stable@...r.kernel.org
>> Fixes: 61a348857e86 ("usb: dwc3: gadget: Fix NULL pointer dereference in dwc3_gadget_suspend")
>> Signed-off-by: Ray Chi <raychi@...gle.com>
>> ---
>>   drivers/usb/dwc3/gadget.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
>> index 28f49400f3e8..de987cffe1ec 100644
>> --- a/drivers/usb/dwc3/gadget.c
>> +++ b/drivers/usb/dwc3/gadget.c
>> @@ -4708,6 +4708,9 @@ int dwc3_gadget_suspend(struct dwc3 *dwc)
>>   	unsigned long flags;
>>   	int ret;
>>   
>> +	if (!dwc->gadget_driver)
>> +		return 0;
>> +
> 
> This directly reverts part of the commit you say this fixes, are you
> SURE about this?  Why?
> 

Hi Ray,

Thinh sent a patch recently addressing the issue in soft disconnect.
Can you check if it helps:

https://lore.kernel.org/all/e3be9b929934e0680a6f4b8f6eb11b18ae9c7e07.1708043922.git.Thinh.Nguyen@synopsys.com/

Regards,
Krishna,