linux-kernel - [PATCH 3.10 33/43] Bluetooth: Fix issue with USB suspend in btusb driver

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Message-Id: <20141028033524.823580607@linuxfoundation.org>
Date:	Tue, 28 Oct 2014 11:36:31 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Champion Chen <champion_chen@...lsil.com.cn>,
	Larry Finger <Larry.Finger@...inger.net>,
	Marcel Holtmann <marcel@...tmann.org>
Subject: [PATCH 3.10 33/43] Bluetooth: Fix issue with USB suspend in btusb driver

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

------------------

From: Champion Chen <champion_chen@...lsil.com.cn>

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@...lsil.com.cn>
Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/bluetooth/btusb.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -302,6 +302,9 @@ static void btusb_intr_complete(struct u
 			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))
@@ -390,6 +393,9 @@ static void btusb_bulk_complete(struct u
 			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))
@@ -484,6 +490,9 @@ static void btusb_isoc_complete(struct u
 				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))


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