linux-kernel - Re: [PATCH v1 1/3] usb: gadget: f_ecm: Add get

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Message-ID: <0b210acd-9030-4038-ac7a-480dc2b5db0f@oss.qualcomm.com>
Date: Tue, 8 Apr 2025 10:35:16 +0530
From: Prashanth K <prashanth.k@....qualcomm.com>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Bakker <kees@...erbout.nl>,
        William McVicker <willmcvicker@...gle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...nel.org" <stable@...nel.org>
Subject: Re: [PATCH v1 1/3] usb: gadget: f_ecm: Add get_status callback



On 08-04-25 06:38 am, Thinh Nguyen wrote:
> On Thu, Apr 03, 2025, Prashanth K wrote:
>> When host sends GET_STATUS to ECM interface, handle the request
>> from the function driver. Since the interface is wakeup capable,
>> set the corresponding bit, and set RW bit if the function is
>> already armed for wakeup by the host.
>>
>> Cc: stable@...nel.org
>> Fixes: 481c225c4802 ("usb: gadget: Handle function suspend feature selector")
>> Signed-off-by: Prashanth K <prashanth.k@....qualcomm.com>
>> ---
>>  drivers/usb/gadget/function/f_ecm.c | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c
>> index 80841de845b0..027226325039 100644
>> --- a/drivers/usb/gadget/function/f_ecm.c
>> +++ b/drivers/usb/gadget/function/f_ecm.c
>> @@ -892,6 +892,12 @@ static void ecm_resume(struct usb_function *f)
>>  	gether_resume(&ecm->port);
>>  }
>>  
>> +static int ecm_get_status(struct usb_function *f)
>> +{
>> +	return (f->func_wakeup_armed ? USB_INTRF_STAT_FUNC_RW : 0) |
>> +		USB_INTRF_STAT_FUNC_RW_CAP;
>> +}
>> +
> 
> Why does USB_INTRF_STAT_FUNC_RW_CAP is set regardless of
> USB_CONFIG_ATT_WAKEUP?
>
We check that in composite.c before calling get_status().
Have added some comments there [Patch v1 2/3] regarding same.

Thanks,
Prashanth K