linux-kernel - Re: [PATCH] usb: phy: msm: Unregister driver interest for VBUS and ID events

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Message-ID: <55DB5040.2060002@sonymobile.com>
Date:	Mon, 24 Aug 2015 10:11:28 -0700
From:	Tim Bird <tim.bird@...ymobile.com>
To:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>,
	Felipe Balbi <balbi@...com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH] usb: phy: msm: Unregister driver interest for VBUS and
 ID events

On 08/18/2015 12:56 AM, Ivan T. Ivanov wrote:
> Right now even if driver failed to probe extcon framework will
> still deliver its VBUS and ID events, which will lead to random
> exception codes.
> 
> Fix this by removing driver interest for VBUS and ID events when
> probe fail.
> 
> Fixes: 591fc116f330 ("usb: phy: msm: Use extcon framework for VBUS and ID detection")
> 
> Reported-by: Tim Bird <tim.bird@...ymobile.com>
> Signed-off-by: Ivan T. Ivanov <ivan.ivanov@...aro.org>
> ---
>  drivers/usb/phy/phy-msm-usb.c | 26 +++++++++++++++++---------
>  1 file changed, 17 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
> index 00c49bb1bd29..a9082567f114 100644
> --- a/drivers/usb/phy/phy-msm-usb.c
> +++ b/drivers/usb/phy/phy-msm-usb.c
> @@ -1581,6 +1581,8 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
>  		ret = extcon_register_interest(&motg->id.conn, ext_id->name,
>  					       "USB-HOST", &motg->id.nb);
>  		if (ret < 0) {
> +			if (!IS_ERR(ext_vbus))
> +				extcon_unregister_interest(&motg->vbus.conn);
>  			dev_err(&pdev->dev, "register ID notifier failed\n");
>  			return ret;
>  		}
...

This patch is obsoleted by commit 83b7b67c7, which changes the extcon API
a bit (from register_interest to register_notifier, among other things).

But, in general, I would expect this approach to work.

Do you want me to re-spin this with the new API?
 -- Tim


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