[3.13.y.z extended stable] Patch "Bluetooth: Fix issue with USB suspend in btusb driver" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    Bluetooth: Fix issue with USB suspend in btusb driver

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11.10.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 892a7984a81f2303e238ed1e8236d45cc846a9f2 Mon Sep 17 00:00:00 2001
From: Champion Chen <champion_chen at realsil.com.cn>
Date: Sat, 6 Sep 2014 14:06:08 -0500
Subject: Bluetooth: Fix issue with USB suspend in btusb driver

commit 85560c4a828ec9c8573840c9b66487b6ae584768 upstream.

Suspend could fail for some platforms because
btusb_suspend==> btusb_stop_traffic ==> usb_kill_anchored_urbs.

When btusb_bulk_complete returns before system suspend and resubmits
an URB, the system cannot enter suspend state.

Signed-off-by: Champion Chen <champion_chen at realsil.com.cn>
Signed-off-by: Larry Finger <Larry.Finger at lwfinger.net>
Signed-off-by: Marcel Holtmann <marcel at holtmann.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/bluetooth/btusb.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 3980fd1..f3cd23d 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -305,6 +305,9 @@ static void btusb_intr_complete(struct urb *urb)
 			BT_ERR("%s corrupted event packet", hdev->name);
 			hdev->stat.err_rx++;
 		}
+	} else if (urb->status == -ENOENT) {
+		/* Avoid suspend failed when usb_kill_urb */
+		return;
 	}

 	if (!test_bit(BTUSB_INTR_RUNNING, &data->flags))
@@ -393,6 +396,9 @@ static void btusb_bulk_complete(struct urb *urb)
 			BT_ERR("%s corrupted ACL packet", hdev->name);
 			hdev->stat.err_rx++;
 		}
+	} else if (urb->status == -ENOENT) {
+		/* Avoid suspend failed when usb_kill_urb */
+		return;
 	}

 	if (!test_bit(BTUSB_BULK_RUNNING, &data->flags))
@@ -487,6 +493,9 @@ static void btusb_isoc_complete(struct urb *urb)
 				hdev->stat.err_rx++;
 			}
 		}
+	} else if (urb->status == -ENOENT) {
+		/* Avoid suspend failed when usb_kill_urb */
+		return;
 	}

 	if (!test_bit(BTUSB_ISOC_RUNNING, &data->flags))
--
1.9.1