linux-kernel - Re: [PATCH 1/1] usb: cdc-acm: handle unlinked urb in acm read callback

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Date:	Tue, 29 Dec 2015 14:26:00 +0100
From:	Oliver Neukum <oneukum@...e.com>
To:	Lu Baolu <baolu.lu@...ux.intel.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tang Jian Qiang <jianqiang.tang@...el.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH 1/1] usb: cdc-acm: handle unlinked urb in acm read
 callback

On Tue, 2015-12-29 at 13:46 +0800, Lu Baolu wrote:
> In current acm driver, the bulk-in callback function ignores the
> URBs unlinked in usb core.
> 
> This causes unexpected data loss in some cases. For example,
> runtime suspend entry will unlinked all urbs and set urb->status
> to -ENOENT even those urbs might have data not processed yet.
> Hence, data loss occurs.
> 
> This patch lets bulk-in callback function handle unlinked urbs
> to avoid data loss.
> 
> Signed-off-by: Tang Jian Qiang <jianqiang.tang@...el.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Cc: stable@...r.kernel.org
Acked-by: Oliver Neukum <oneukum@...e.com>



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