linux-kernel - [PATCH 4/5] swsusp: fix error paths in snapshot

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Message-Id: <200703202226.42673.rjw@sisk.pl>
Date:	Tue, 20 Mar 2007 22:26:42 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Pavel Machek <pavel@....cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/5] swsusp: fix error paths in snapshot_open

From: Rafael J. Wysocki <rjw@...k.pl>

We forget to increase device_available if there's an error in
snapshot_open(), so the snapshot device cannot be open at all after
snapshot_open() has returned an error.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Acked-by: Pavel Machek <pavel@....cz>
---
 kernel/power/user.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

Index: linux-2.6.21-rc4-mm1/kernel/power/user.c
===================================================================
--- linux-2.6.21-rc4-mm1.orig/kernel/power/user.c	2007-03-20 21:19:31.000000000 +0100
+++ linux-2.6.21-rc4-mm1/kernel/power/user.c	2007-03-20 21:35:59.000000000 +0100
@@ -49,12 +49,14 @@ static int snapshot_open(struct inode *i
 	if (!atomic_add_unless(&device_available, -1, 0))
 		return -EBUSY;
 
-	if ((filp->f_flags & O_ACCMODE) == O_RDWR)
+	if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
+		atomic_inc(&device_available);
 		return -ENOSYS;
-
-	if(create_basic_memory_bitmaps())
+	}
+	if(create_basic_memory_bitmaps()) {
+		atomic_inc(&device_available);
 		return -ENOMEM;
-
+	}
 	nonseekable_open(inode, filp);
 	data = &snapshot_state;
 	filp->private_data = data;

-
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