This is a note to let you know that I've just added the patch titled
USB: hub: change the locking in hub_activate
to the 4.4-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-hub-change-the-locking-in-hub_activate.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 07d316a22e119fa301fd7dba7f1e1adfd4f72c05 Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 5 Aug 2016 11:51:30 -0400
Subject: USB: hub: change the locking in hub_activate
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
commit 07d316a22e119fa301fd7dba7f1e1adfd4f72c05 upstream.
The locking in hub_activate() is not adequate to provide full mutual
exclusion with hub_quiesce(). The subroutine locks the hub's
usb_interface, but the callers of hub_quiesce() (such as
hub_pre_reset() and hub_event()) hold the lock to the hub's
usb_device.
This patch changes hub_activate() to make it acquire the same lock as
those other routines.
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hub.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1036,7 +1036,7 @@ static void hub_activate(struct usb_hub
/* Continue a partial initialization */
if (type == HUB_INIT2 || type == HUB_INIT3) {
- device_lock(hub->intfdev);
+ device_lock(&hdev->dev);
/* Was the hub disconnected while we were waiting? */
if (hub->disconnected)
@@ -1243,7 +1243,7 @@ static void hub_activate(struct usb_hub
queue_delayed_work(system_power_efficient_wq,
&hub->init_work,
msecs_to_jiffies(delay));
- device_unlock(hub->intfdev);
+ device_unlock(&hdev->dev);
return; /* Continues at init3: below */
} else {
msleep(delay);
@@ -1266,7 +1266,7 @@ static void hub_activate(struct usb_hub
/* Allow autosuspend if it was suppressed */
disconnected:
usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
- device_unlock(hub->intfdev);
+ device_unlock(&hdev->dev);
}
kref_put(&hub->kref, hub_release);
Patches currently in stable-queue which might be from stern@xxxxxxxxxxxxxxxxxxx are
queue-4.4/usb-ehci-change-order-of-register-cleanup-during-shutdown.patch
queue-4.4/usb-hub-fix-up-early-exit-pathway-in-hub_activate.patch
queue-4.4/usb-hub-change-the-locking-in-hub_activate.patch
queue-4.4/usb-validate-wmaxpacketvalue-entries-in-endpoint-descriptors.patch
queue-4.4/usb-serial-fix-memleak-in-driver-registration-error-path.patch
queue-4.4/usb-hub-fix-unbalanced-reference-count-memory-leak-deadlocks.patch
queue-4.4/usb-misc-usbtest-add-fix-for-driver-hang.patch
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