[PATCH 3.16.y-ckt 015/129] usb: cdc-acm: handle unlinked urb in acm read callback

From: Luis Henriques
Date: Fri Feb 26 2016 - 06:07:47 EST

3.16.7-ckt25 -stable review patch. If anyone has any objections, please let me know.


From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

commit 19454462acb1bdef80542061bdc9b410e4ed1ff6 upstream.

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@xxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Acked-by: Oliver Neukum <oneukum@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[ luis: backported to 3.16:
- use 'urb->status' instead of local variable 'status'
- adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
drivers/usb/class/cdc-acm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index f2dc4628fb05..9cda90098a57 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -427,7 +427,8 @@ static void acm_read_bulk_callback(struct urb *urb)
if (urb->status) {
dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
__func__, urb->status);
- return;
+ if ((urb->status != -ENOENT) || (urb->actual_length == 0))
+ return;