patch "USB: serial: sierra: fix potential deadlock at close" added to usb-testing

patch "USB: serial: sierra: fix potential deadlock at close" added to usb-testing

[gregkh]

This is a note to let you know that I've just added the patch titled

    USB: serial: sierra: fix potential deadlock at close

to my usb git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-testing branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will be merged to the usb-next branch sometime soon,
after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.


>From e60870012e5a35b1506d7b376fddfb30e9da0b27 Mon Sep 17 00:00:00 2001
From: John Ogness <john.ogness@linutronix.de>
Date: Sun, 24 Jun 2018 00:32:11 +0200
Subject: USB: serial: sierra: fix potential deadlock at close

The portdata spinlock can be taken in interrupt context (via
sierra_outdat_callback()).
Disable interrupts when taking the portdata spinlock when discarding
deferred URBs during close to prevent a possible deadlock.

Fixes: 014333f77c0b ("USB: sierra: fix urb and memory leak on disconnect")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[ johan: amend commit message and add fixes and stable tags ]
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/sierra.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index d189f953c891..55956a638f5b 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -770,9 +770,9 @@ static void sierra_close(struct usb_serial_port *port)
 		kfree(urb->transfer_buffer);
 		usb_free_urb(urb);
 		usb_autopm_put_interface_async(serial->interface);
-		spin_lock(&portdata->lock);
+		spin_lock_irq(&portdata->lock);
 		portdata->outstanding_urbs--;
-		spin_unlock(&portdata->lock);
+		spin_unlock_irq(&portdata->lock);
 	}
 
 	sierra_stop_rx_urbs(port);
-- 
2.18.0