3.13.11-ckt35 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
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>
[ kamal: backport to 3.19-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@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 87f216d..917cfdc 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -399,7 +399,8 @@ 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;
}
acm_process_read_urb(acm, urb);
--
1.9.1
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