linux-kernel - [PATCH] xen/events/fifo: Add missing hotplug notifier transition

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Date:	Fri, 11 Mar 2016 10:00:22 +0100
From:	Anna-Maria Gleixner <anna-maria@...utronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	rt@...utronix.de, Anna-Maria Gleixner <anna-maria@...utronix.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	xen-devel@...ts.xenproject.org
Subject: [PATCH] xen/events/fifo: Add missing hotplug notifier transition

The evtchn_fifo_cpu_notification() hotplug callback lacks handling of
the CPU_UP_CANCELED case. That means, if CPU_UP_PREPARE fails, the
handle of the fifo events is not dropped.

Add handling for CPU_UP_CANCELED transition to drop the fifo events
handle.

Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: David Vrabel <david.vrabel@...rix.com>
Cc: xen-devel@...ts.xenproject.org
Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
---
 drivers/xen/events/events_fifo.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -432,6 +432,7 @@ static int evtchn_fifo_cpu_notification(
 			ret = evtchn_fifo_alloc_control_block(cpu);
 		break;
 	case CPU_DEAD:
+	case CPU_UP_CANCELED:
 		__evtchn_fifo_handle_events(cpu, true);
 		break;
 	default: