linux-kernel - Re: [PACTH v1] cdc-wdm: Clear read pipeline in case of error

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Date:	Tue, 02 Aug 2016 14:23:15 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	robert.foss@...labora.com
Cc:	pprabhu@...omium.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PACTH v1] cdc-wdm: Clear read pipeline in case of error

On Thu, 2016-07-28 at 14:19 -0400, robert.foss@...labora.com wrote:
> From: Prathmesh Prabhu <pprabhu@...omium.org>
> 
> Implemented queued response handling. This queue is processed every
> time the
> WDM_READ flag is cleared.
> 
> In case of a read error, userspace may not actually read the data,
> since the
> driver returns an error through wdm_poll. After this, the underlying
> device may
> attempt to send us more data, but the queue is not processed. While
> userspace is
> also blocked, because the read error is never cleared.

Could you explain why user space cannot just read more data?
That will clear the error.

	Regards
		Oliver