linux-kernel - Re: f_hid.c conversion to the new function interface and crash due to race

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Date:   Wed, 9 Aug 2017 08:10:59 -0700
From:   Variksla <variksla@...il.com>
To:     Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:     bjorn@...k.no, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, jikos@...nel.org,
        linux-usb@...r.kernel.org, Pavel Machek <pavel@....cz>,
        balbi@...com, eu@...ipetonello.com, k.opasiak@...sung.com
Subject: Re: f_hid.c conversion to the new function interface and crash due to race



> On Aug 9, 2017, at 2:56 AM, Felipe Balbi <felipe.balbi@...ux.intel.com> wrote:

Thanks for replying.
> 
> 
> Hi,
> 
> noman pouigt <variksla@...il.com> writes:
>> Hello,
>> 
>> I am currently using 3.18 linux kernel and getting below
> 
> return -EKERNELTOOOLD;
> 
> Sorry, you're on your own. You should ask for support from whoever
> forces you to use 3.18 kernel.

I have updated f_hid.c file to latest kernel though as I knew it would be too much to ask to get support for old code.

I am just not sure about how to instantiate the function driver as earlier f_fs was instantiating the hid driver. However, after hid got converted to new function driver who is responsible for calling setup, bind and unbind functions in f_hid.c ?

Below is the glue code in android.c.
drivers/usb/gadget/android.c
static struct android_usb_function hid_function = {
       .name           = "hid",
       .init           = hid_function_init,
       .cleanup        = hid_function_cleanup,
       .bind_config    = hid_function_bind_config,
       .attributes     = hid_function_attributes,
};

Is there something similar in new function driver in upstream kernel?
> 
> -- 
> balbi