This is a note to let you know that I've just added the patch titled
USB: serial: fix potential runtime pm imbalance at device remove
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-serial-fix-potential-runtime-pm-imbalance-at-device-remove.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c14829fad88dbeda57253590695b85ba51270621 Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@xxxxxxxxx>
Date: Mon, 26 May 2014 19:23:33 +0200
Subject: USB: serial: fix potential runtime pm imbalance at device remove
From: Johan Hovold <jhovold@xxxxxxxxx>
commit c14829fad88dbeda57253590695b85ba51270621 upstream.
Only call usb_autopm_put_interface() if the corresponding
usb_autopm_get_interface() was successful.
This prevents a potential runtime PM counter imbalance should
usb_autopm_get_interface() fail. Note that the USB PM usage counter is
reset when the interface is unbound, but that the runtime PM counter may
be left unbalanced.
Also add comment on why we don't need to worry about racing
resume/suspend on autopm_get failures.
Fixes: d5fd650cfc7f ("usb: serial: prevent suspend/resume from racing
against probe/remove")
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/serial/bus.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -97,13 +97,19 @@ static int usb_serial_device_remove(stru
struct usb_serial_port *port;
int retval = 0;
int minor;
+ int autopm_err;
port = to_usb_serial_port(dev);
if (!port)
return -ENODEV;
- /* make sure suspend/resume doesn't race against port_remove */
- usb_autopm_get_interface(port->serial->interface);
+ /*
+ * Make sure suspend/resume doesn't race against port_remove.
+ *
+ * Note that no further runtime PM callbacks will be made if
+ * autopm_get fails.
+ */
+ autopm_err = usb_autopm_get_interface(port->serial->interface);
minor = port->minor;
tty_unregister_device(usb_serial_tty_driver, minor);
@@ -117,7 +123,9 @@ static int usb_serial_device_remove(stru
dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
driver->description, minor);
- usb_autopm_put_interface(port->serial->interface);
+ if (!autopm_err)
+ usb_autopm_put_interface(port->serial->interface);
+
return retval;
}
Patches currently in stable-queue which might be from jhovold@xxxxxxxxx are
queue-3.14/usb-sierra-fix-urb-and-memory-leak-in-resume-error-path.patch
queue-3.14/usb-sierra-fix-aa-deadlock-in-open-error-path.patch
queue-3.14/usb-usb_wwan-fix-urb-leak-at-shutdown.patch
queue-3.14/usb-qcserial-add-additional-sierra-wireless-qmi-devices.patch
queue-3.14/usb-option-fix-runtime-pm-handling.patch
queue-3.14/usb-sierra-fix-remote-wakeup.patch
queue-3.14/usb-sierra-fix-urb-and-memory-leak-on-disconnect.patch
queue-3.14/net-cpsw-fix-null-dereference-at-probe.patch
queue-3.14/usb-sierra-fix-use-after-free-at-suspend-resume.patch
queue-3.14/usb-usb_wwan-fix-write-and-suspend-race.patch
queue-3.14/revert-net-eth-cpsw-correctly-attach-to-gpio-bitbang-mdio.patch
queue-3.14/usb-serial-fix-potential-runtime-pm-imbalance-at-device-remove.patch
queue-3.14/usb-usb_wwan-fix-potential-null-deref-at-resume.patch
queue-3.14/usb-usb_wwan-fix-race-between-write-and-resume.patch
queue-3.14/usb-usb_wwan-fix-potential-blocked-i-o-after-resume.patch
queue-3.14/usb-usb_wwan-fix-urb-leak-in-write-error-path.patch
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