linux-kernel - [PATCH 4.9 010/101] usb: do not reset if a low-speed or full-speed device timed out

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Message-Id: <20180701160757.551199326@linuxfoundation.org>
Date:   Sun,  1 Jul 2018 18:20:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Maxim Moseychuk <franchesko.salias.hudro.pedros@...il.com>
Subject: [PATCH 4.9 010/101] usb: do not reset if a low-speed or full-speed device timed out

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

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

From: Maxim Moseychuk <franchesko.salias.hudro.pedros@...il.com>

commit 6e01827ed93947895680fbdad68c072a0f4e2450 upstream.

Some low-speed and full-speed devices (for example, bluetooth)
do not have time to initialize. For them, ETIMEDOUT is a valid error.
We need to give them another try. Otherwise, they will
never be initialized correctly and in dmesg will be messages
"Bluetooth: hci0 command 0x1002 tx timeout" or similars.

Fixes: 264904ccc33c ("usb: retry reset if a device times out")
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Maxim Moseychuk <franchesko.salias.hudro.pedros@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/core/hub.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -4509,7 +4509,9 @@ hub_port_init(struct usb_hub *hub, struc
 				 * reset. But only on the first attempt,
 				 * lest we get into a time out/reset loop
 				 */
-				if (r == 0  || (r == -ETIMEDOUT && retries == 0))
+				if (r == 0 || (r == -ETIMEDOUT &&
+						retries == 0 &&
+						udev->speed > USB_SPEED_FULL))
 					break;
 			}
 			udev->descriptor.bMaxPacketSize0 =