usb: cdc-acm: handle unlinked urb in acm read callback
authorLu Baolu <baolu.lu@linux.intel.com>
Wed, 30 Dec 2015 04:59:08 +0000 (12:59 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 25 Jan 2016 05:06:21 +0000 (21:06 -0800)
commit19454462acb1bdef80542061bdc9b410e4ed1ff6
tree8020236445dcbfe2f75ffe32df70f54d8067da0c
parent92e963f50fc74041b5e9e744c330dca48e04f08d
usb: cdc-acm: handle unlinked urb in acm read callback

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@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: stable@vger.kernel.org
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/class/cdc-acm.c