linux-kernel - [PATCH AUTOSEL 3.18 36/98] usb: serial: handle -ENODEV quietly in generic_submit_read

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Message-Id: <20181025141853.214051-36-sashal@kernel.org>
Date:   Thu, 25 Oct 2018 10:17:51 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jeremiah Mahler <jmmahler@...il.com>,
        Johan Hovold <johan@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 3.18 36/98] usb: serial: handle -ENODEV quietly in generic_submit_read_urb

From: Jeremiah Mahler <jmmahler@...il.com>

[ Upstream commit 04f9c6e6d17584340fb6c8a9469a0e6df28876d2 ]

If a USB serial device (e.g. /dev/ttyUSB0) with an active program is
unplugged, an -ENODEV (19) error will be produced after it gives up
trying to resubmit a read.

  usb_serial_generic_submit_read_urb - usb_submit_urb failed: -19

Add -ENODEV as one of the permanent errors along with -EPERM that
usb_serial_generic_submit_read_urb() handles quietly without an error.

Signed-off-by: Jeremiah Mahler <jmmahler@...il.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/serial/generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index c44b911937e8..54e170dd3dad 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -287,7 +287,7 @@ static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
 
 	res = usb_submit_urb(port->read_urbs[index], mem_flags);
 	if (res) {
-		if (res != -EPERM) {
+		if (res != -EPERM && res != -ENODEV) {
 			dev_err(&port->dev,
 					"%s - usb_submit_urb failed: %d\n",
 					__func__, res);
-- 
2.17.1