netdev - Re: [PATCH] usbnet: Activate halt interrupt endpoint before re-submit URB

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Message-ID: <CACVXFVMy6Hrqgw6rmAXv5YXD86sLF+FUPTRRcXKs40uwN6ioCg@mail.gmail.com>
Date:	Wed, 20 Jun 2012 18:15:25 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Huajun Li <huajun.li.lee@...il.com>,
	David Miller <davem@...emloft.net>, stern@...land.harvard.edu,
	linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] usbnet: Activate halt interrupt endpoint before re-submit URB

On Wed, Jun 20, 2012 at 4:58 PM, Oliver Neukum <oneukum@...e.de> wrote:
> Am Mittwoch, 20. Juni 2012, 10:07:55 schrieb Ming Lei:
>> BTW, maybe it is better to add below
>>
>>     usbnet_defer_kevent(dev, EVENT_STS_HALT);
>>
>> for -EPIPE returned from usb_urb_submit if it will be resent.
>
> Why? If it failed once it'll probably also fail the next time.

-EPIPE just means the endpoint is halted, either from usb_urb_submit
or urb->status, so the HALT should be cleared in the situation.

> In that case we'd need to do something more intrusive
> like resetting the device, but that cannot be done well
> in the generic usbnet part.

IMO, resetting is not needed for -EPIPE, but may be needed for
-EPROTO failure.

Thanks,
-- 
Ming Lei
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