linux-kernel - Re: [PATCH v1 1/2] usb: gadget: udc: core: Invoke usb_gadget

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Date:   Wed, 5 Apr 2023 23:31:10 -0700
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     stern@...land.harvard.edu, colin.i.king@...il.com,
        xuetao09@...wei.com, quic_eserrao@...cinc.com,
        water.zhangjiantao@...wei.com, peter.chen@...escale.com,
        balbi@...com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v1 1/2] usb: gadget: udc: core: Invoke usb_gadget_connect
 only when started

On Wed, Apr 5, 2023 at 11:29 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Thu, Apr 06, 2023 at 06:19:04AM +0000, Badhri Jagan Sridharan wrote:
> > usb_udc_connect_control does not check to see if the udc
> > has already been started. This causes gadget->ops->pullup
> > to be called through usb_gadget_connect when invoked
> > from usb_udc_vbus_handler even before usb_gadget_udc_start
> > is called. Guard this by checking for udc->started in
> > usb_udc_connect_control before invoking usb_gadget_connect.
> >
> > Guarding udc_connect_control, udc->started and udc->vbus
> > with its own mutex as usb_udc_connect_control_locked
> > can be simulataneously invoked from different code paths.
> >
> > Cc: stable@...r.kernel.org
> >
> > Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
> > Fixes: 628ef0d273a6 ("usb: udc: add usb_udc_vbus_handler")
> > ---
> >  drivers/usb/gadget/udc/core.c | 20 ++++++++++++++++----
> >  1 file changed, 16 insertions(+), 4 deletions(-)
>
> Why resend v1 when it's been reviewed already?

I just now sent a note.
Apologies resent V1 again instead of V2. Have sent V2 for real.
Sorry for the confusion.

>
> confused,
>
> greg k-h