From 986c1748c84d7727defeaeca74a73b37f7d5cce1 Mon Sep 17 00:00:00 2001
From: Bin Liu <b-liu@ti.com>
Date: Wed, 13 May 2020 16:36:46 -0500
Subject: [PATCH] USB: serial: usb_wwan: do not resubmit rx urb on fatal errors
Git-commit: 986c1748c84d7727defeaeca74a73b37f7d5cce1
References: git-fixes
Patch-mainline: v5.8-rc1
usb_wwan_indat_callback() shouldn't resubmit rx urb if the previous urb
status is a fatal error. Or the usb controller would keep processing the
new urbs then run into interrupt storm, and has no chance to recover.
Fixes: 6c1ee66a0b2b ("USB-Serial: Fix error handling of usb_wwan")
Cc: stable@vger.kernel.org
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/usb/serial/usb_wwan.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 13be21aad2f4..4b9845807bee 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -270,6 +270,10 @@ static void usb_wwan_indat_callback(struct urb *urb)
if (status) {
dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
__func__, status, endpoint);
+
+ /* don't resubmit on fatal errors */
+ if (status == -ESHUTDOWN || status == -ENOENT)
+ return;
} else {
if (urb->actual_length) {
tty_insert_flip_string(&port->port, data,
--
2.16.4