This is a note to let you know that I've just added the patch titled
xen/manage: fix potential deadlock when resuming the console
to the 3.15-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:
xen-manage-fix-potential-deadlock-when-resuming-the-console.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 1b6478231c6f5f844185acb32045cf195028cfce Mon Sep 17 00:00:00 2001
From: David Vrabel <[email protected]>
Date: Wed, 2 Jul 2014 17:25:23 +0100
Subject: xen/manage: fix potential deadlock when resuming the console
From: David Vrabel <[email protected]>
commit 1b6478231c6f5f844185acb32045cf195028cfce upstream.
Calling xen_console_resume() in xen_suspend() causes a warning because
it locks irq_mapping_update_lock (a mutex) and this may sleep. If a
userspace process is using the evtchn device then this mutex may be
locked at the point of the stop_machine() call and
xen_console_resume() would then deadlock.
Resuming the console after stop_machine() returns avoids this
deadlock.
Signed-off-by: David Vrabel <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/xen/manage.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -109,7 +109,6 @@ static int xen_suspend(void *data)
if (!si->cancelled) {
xen_irq_resume();
- xen_console_resume();
xen_timer_resume();
}
@@ -166,6 +165,10 @@ static void do_suspend(void)
err = stop_machine(xen_suspend, &si, cpumask_of(0));
+ /* Resume console as early as possible. */
+ if (!si.cancelled)
+ xen_console_resume();
+
raw_notifier_call_chain(&xen_resume_notifier, 0, NULL);
dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
Patches currently in stable-queue which might be from [email protected]
are
queue-3.15/xen-manage-fix-potential-deadlock-when-resuming-the-console.patch
queue-3.15/xen-balloon-set-ballooned-out-pages-as-invalid-in-p2m.patch
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