From: Anthony PERARD <anthony.perard@citrix.com>
Date: Tue, 26 Feb 2013 17:57:02 +0000 (+0000)
Subject: hvc: clear some status flags.
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=HEAD;p=people%2Faperard%2Flinux-arndale.git

hvc: clear some status flags.

without this, the request_irq failed with -22 (hvc_open).
---

diff --git a/drivers/tty/hvc/hvc_irq.c b/drivers/tty/hvc/hvc_irq.c
index c9adb0559f61c..a96d37f263ac6 100644
--- a/drivers/tty/hvc/hvc_irq.c
+++ b/drivers/tty/hvc/hvc_irq.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 
 #include "hvc_console.h"
 
@@ -28,6 +29,7 @@ int notifier_add_irq(struct hvc_struct *hp, int irq)
 		hp->irq_requested = 0;
 		return 0;
 	}
+	irq_clear_status_flags(irq, IRQ_NOREQUEST|IRQ_NOAUTOEN);
 	rc = request_irq(irq, hvc_handle_interrupt, 0,
 			   "hvc_console", hp);
 	if (!rc)