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Date: Wed, 18 Jul 2007 01:53:48 -0400
From: Jeff Garzik <jeff@...zik.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Greg KH <greg@...ah.com>, Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 1/3] drivers/base/core: improve device_add() error
handling, fix bugs
The following change was checked into 'warnings' branch of
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git
commit 5330916f5a11d8b7def46a6b3e14a831684032f5
Author: Jeff Garzik <jeff@...zik.org>
Date: Wed Jul 18 01:41:29 2007 -0400
drivers/base/core: improve device_add() error handling, fix bugs
* silence several warnings by handling sysfs_create_link() failure
* re-order some operations in error handling, to precisely reverse
the order of operations, i.e. unwind properly.
Signed-off-by: Jeff Garzik <jeff@...zik.org>
drivers/base/core.c | 46 ++++++++++++++++++++++++++++++----------------
1 file changed, 30 insertions(+), 16 deletions(-)
5330916f5a11d8b7def46a6b3e14a831684032f5
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 0455aa7..f26c005 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -698,16 +698,26 @@ int device_add(struct device *dev)
}
if (dev->class) {
- sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj,
- "subsystem");
+ error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj,
+ "subsystem");
+ if (error)
+ goto ClassSubsysError;
+
/* If this is not a "fake" compatible device, then create the
* symlink from the class to the device. */
- if (dev->kobj.parent != &dev->class->subsys.kobj)
- sysfs_create_link(&dev->class->subsys.kobj,
- &dev->kobj, dev->bus_id);
+ if (dev->kobj.parent != &dev->class->subsys.kobj) {
+ error = sysfs_create_link(&dev->class->subsys.kobj,
+ &dev->kobj, dev->bus_id);
+ if (error)
+ goto ClassDevLinkError;
+ }
+
if (parent) {
- sysfs_create_link(&dev->kobj, &dev->parent->kobj,
- "device");
+ error = sysfs_create_link(&dev->kobj,&dev->parent->kobj,
+ "device");
+ if (error)
+ goto ParentDevLinkError;
+
#ifdef CONFIG_SYSFS_DEPRECATED
class_name = make_class_name(dev->class->name,
&dev->kobj);
@@ -755,16 +765,7 @@ int device_add(struct device *dev)
BUS_NOTIFY_DEL_DEVICE, dev);
device_remove_attrs(dev);
AttrsError:
- if (MAJOR(dev->devt))
- device_remove_file(dev, &devt_attr);
-
if (dev->class) {
- sysfs_remove_link(&dev->kobj, "subsystem");
- /* If this is not a "fake" compatible device, remove the
- * symlink from the class to the device. */
- if (dev->kobj.parent != &dev->class->subsys.kobj)
- sysfs_remove_link(&dev->class->subsys.kobj,
- dev->bus_id);
if (parent) {
#ifdef CONFIG_SYSFS_DEPRECATED
char *class_name = make_class_name(dev->class->name,
@@ -776,7 +777,20 @@ int device_add(struct device *dev)
#endif
sysfs_remove_link(&dev->kobj, "device");
}
+
+ ParentDevLinkError:
+ /* If this is not a "fake" compatible device, remove the
+ * symlink from the class to the device. */
+ if (dev->kobj.parent != &dev->class->subsys.kobj)
+ sysfs_remove_link(&dev->class->subsys.kobj,
+ dev->bus_id);
+
+ ClassDevLinkError:
+ sysfs_remove_link(&dev->kobj, "subsystem");
}
+ ClassSubsysError:
+ if (MAJOR(dev->devt))
+ device_remove_file(dev, &devt_attr);
ueventattrError:
device_remove_file(dev, &uevent_attr);
attrError:
-
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