linux-kernel - [PATCH] UML - Console should handle spurious IRQS

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Message-ID: <20070727152344.GA6776@c2.user-mode-linux.org>
Date:	Fri, 27 Jul 2007 11:23:44 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	Eduard-Gabriel Munteanu <maxdamage@...din.ro>
Subject: [PATCH] UML - Console should handle spurious IRQS

The previous DEBUG_SHIRQ patch missed one case.  The console doesn't
set its host descriptors non-blocking.

Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
--
 arch/um/drivers/chan_kern.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Index: linux-2.6.21-mm/arch/um/drivers/chan_kern.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/drivers/chan_kern.c	2007-07-27 10:52:02.000000000 -0400
+++ linux-2.6.21-mm/arch/um/drivers/chan_kern.c	2007-07-27 11:09:12.000000000 -0400
@@ -157,7 +157,7 @@ static void tty_receive_char(struct tty_
 
 static int open_one_chan(struct chan *chan)
 {
-	int fd;
+	int fd, err;
 
 	if(chan->opened)
 		return 0;
@@ -168,6 +168,13 @@ static int open_one_chan(struct chan *ch
 				     chan->data, &chan->dev);
 	if(fd < 0)
 		return fd;
+
+	err = os_set_fd_block(fd, 0);
+	if (err) {
+		(*chan->ops->close)(fd, chan->data);
+		return err;
+	}
+
 	chan->fd = fd;
 
 	chan->opened = 1;
-
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