linux-kernel - [PATCH] mtd/maps/physmap: catch failure to register MTD_PHYSMAP

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Message-ID: <0D753D10438DA54287A00B0270842697636A7E9D36@AUSP01VMBX24.collaborationhost.net>
Date:	Fri, 2 Apr 2010 17:46:30 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>
CC:	David Woodhouse <dwmw2@...radead.org>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>
Subject: [PATCH] mtd/maps/physmap: catch failure to register
 MTD_PHYSMAP_COMPAT device

If the default Kconfig values are used with MTD_PHYSMAP_COMPAT you end
up with a resource where end < start.  This causes __request_resource to
return a conflict which then returns an -EBUSY error code.  The current
physmap.c code just assumes that the platfom_device_register will always
succeed.

Catch this failure during the physmap_init and propogate the error.

Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Reported-by: Randy Dunlap <randy.dunlap@...cle.com>

---

diff --git a/drivers/mtd/maps/physmap.c b/drivers/mtd/maps/physmap.c
index d9603f7..426461a 100644
--- a/drivers/mtd/maps/physmap.c
+++ b/drivers/mtd/maps/physmap.c
@@ -264,8 +264,11 @@ static int __init physmap_init(void)
 
 	err = platform_driver_register(&physmap_flash_driver);
 #ifdef CONFIG_MTD_PHYSMAP_COMPAT
-	if (err == 0)
-		platform_device_register(&physmap_flash);
+	if (err == 0) {
+		err = platform_device_register(&physmap_flash);
+		if (err)
+			platform_driver_unregister(&physmap_flash_driver);
+	}
 #endif
 
 	return err;