linux-kernel - [PATCH 4.14 007/164] can: mcba_usb: fix device disconnect bug

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Message-Id: <20171212123444.147130348@linuxfoundation.org>
Date:   Tue, 12 Dec 2017 13:43:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Martin Kelly <mkelly@...o.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4.14 007/164] can: mcba_usb: fix device disconnect bug

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

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

From: Martin Kelly <mkelly@...o.com>

commit 1cb35a33a28394fd711bb26ddf3a564f4e9d9125 upstream.

Currently, when you disconnect the device, the driver infinitely
resubmits all URBs, so you see:

Rx URB aborted (-32)

in an infinite loop.

Fix this by catching -EPIPE (what we get in urb->status when the device
disconnects) and not resubmitting.

With this patch, I can plug and unplug many times and the driver
recovers correctly.

Signed-off-by: Martin Kelly <mkelly@...o.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/can/usb/mcba_usb.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/can/usb/mcba_usb.c
+++ b/drivers/net/can/usb/mcba_usb.c
@@ -592,6 +592,7 @@ static void mcba_usb_read_bulk_callback(
 		break;
 
 	case -ENOENT:
+	case -EPIPE:
 	case -ESHUTDOWN:
 		return;