linux-kernel - Re: [PATCH v4 2/3] Revert "Revert "usb: gadget: udc: core: Prevent redundant calls to pullup""

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Message-ID: <224b6dd7-03e4-4d49-8dca-d13619367371@rowland.harvard.edu>
Date:   Mon, 29 May 2023 20:44:05 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Badhri Jagan Sridharan <badhri@...gle.com>
Cc:     gregkh@...uxfoundation.org, colin.i.king@...il.com,
        xuetao09@...wei.com, quic_eserrao@...cinc.com,
        water.zhangjiantao@...wei.com, peter.chen@...escale.com,
        balbi@...com, francesco@...cini.it, alistair@...stair23.me,
        stephan@...hold.net, bagasdotme@...il.com, luca@...tu.xyz,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v4 2/3] Revert "Revert "usb: gadget: udc: core: Prevent
 redundant calls to pullup""

On Mon, May 29, 2023 at 11:48:15PM +0000, Badhri Jagan Sridharan wrote:
> This reverts commit 5e1617210aede9f1b91bb9819c93097b6da481f9.
> 
> The regression reported in
> https://lore.kernel.org/all/ZF4bMptC3Lf2Hnee@gerhold.net/ is being
> fixed in
> commit 7d7863db7cc0 ("usb: gadget: udc: core: Offload usb_udc_vbus_handler processing").
> Hence reverting the revert.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
> ---
>  drivers/usb/gadget/udc/core.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
> index 583c339876ab..4641153e9706 100644
> --- a/drivers/usb/gadget/udc/core.c
> +++ b/drivers/usb/gadget/udc/core.c
> @@ -703,6 +703,9 @@ static int usb_gadget_connect_locked(struct usb_gadget *gadget)
>  		goto out;
>  	}
>  
> +	if (gadget->connected)
> +		goto out;
> +
>  	if (gadget->deactivated || !gadget->udc->started) {
>  		/*
>  		 * If gadget is deactivated we only save new state.

This is silly.  There's no need to make this a separate commit; it 
should be merged in with the preceding patch.  There's no good reason 
for creating a commit that contains a known error.

Alan Stern