linux-kernel - Re: [PATCH] usb: host: Use helper function to get endpoint

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Message-ID: <CAABMjtH8WqoraFLQ=-TTwah=A+PRjRjJ2hS-ySK_5h9qYyy8Sg@mail.gmail.com>
Date:   Thu, 25 Aug 2022 02:36:46 +0600
From:   Khalid Masum <khalid.masum.92@...il.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Arnd Bergmann <arnd@...db.de>,
        Matthias Kaehlcke <mka@...omium.org>,
        Alexey Sheplyakov <asheplyakov@...ealt.ru>,
        Weitao Wang <WeitaoWang-oc@...oxin.com>,
        linux-kernel-mentees 
        <linux-kernel-mentees@...ts.linuxfoundation.org>
Subject: Re: [PATCH] usb: host: Use helper function to get endpoint

On Thu, Aug 25, 2022 at 1:24 AM Alan Stern <stern@...land.harvard.edu> wrote:
>
> udev is not a usb_device structure; it is a _pointer_ to a usb_device
> structure.  The pointer is created when ehset_single_step_set_feature()
> calls usb_hub_find_child(), but the structure itself gets created long
> before that, when the USB device is first detected and initialized.
>
> You can see this happening where hub_port_connect() calls
> usb_alloc_dev().  The ep0 field is filled in by hub_port_init() and the
> routines it calls.
>
Thanks for clarifying this. That helps a lot.

-- Khalid Masum