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

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Date:   Thu, 6 Apr 2023 08:29:38 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Badhri Jagan Sridharan <badhri@...gle.com>
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 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?

confused,

greg k-h