linux-kernel - Re: [PATCH] usb: gadget: udc_core: Use right kobj when calling sysfs

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Message-ID: <20140916020223.GD3379@peterchendt>
Date:	Tue, 16 Sep 2014 10:02:25 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Andreas Larsson <andreas@...sler.com>
CC:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<software@...sler.com>
Subject: Re: [PATCH] usb: gadget: udc_core: Use right kobj when calling
 sysfs_notify

On Mon, Sep 15, 2014 at 12:42:27PM +0200, Andreas Larsson wrote:
> The state attribute is connected to the kobj of the udc, not the gadget.
> 
> Signed-off-by: Andreas Larsson <andreas@...sler.com>
> ---
>  drivers/usb/gadget/udc/udc-core.c |   14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
> index b0d9817..37c129a 100644
> --- a/drivers/usb/gadget/udc/udc-core.c
> +++ b/drivers/usb/gadget/udc/udc-core.c
> @@ -109,8 +109,20 @@ EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
>  static void usb_gadget_state_work(struct work_struct *work)
>  {
>  	struct usb_gadget	*gadget = work_to_gadget(work);
> +	struct usb_udc		*udc = NULL;
> +
> +	mutex_lock(&udc_lock);
> +	list_for_each_entry(udc, &udc_list, list)
> +		if (udc->gadget == gadget)
> +			goto found;
> +	mutex_unlock(&udc_lock);
> +
> +	return;
> +
> +found:
> +	mutex_unlock(&udc_lock);
>  
> -	sysfs_notify(&gadget->dev.kobj, NULL, "state");
> +	sysfs_notify(&udc->dev.kobj, NULL, "state");
>  }
>  
>  void usb_gadget_set_state(struct usb_gadget *gadget,

What's the user mode difference with and without this patch?

-- 
Best Regards,
Peter Chen
--
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