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Message-ID: <20061127103507.0b6628ab@gondolin.boeblingen.de.ibm.com>
Date: Mon, 27 Nov 2006 10:35:07 +0100
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: Greg K-H <greg@...ah.com>
Cc: Andrew Morton <akpm@...l.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: [Patch 2/7] driver core fixes: sysfs_create_link() retval checks in
core.c
From: Cornelia Huck <cornelia.huck@...ibm.com>
Check for return value of sysfs_create_link() in device_add()
and device_rename(). Add helper functions device_add_class_symlinks() and
device_remove_class_symlinks() to make the code easier to read.
Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
---
drivers/base/core.c | 142 +++++++++++++++++++++++++++++++++++++---------------
1 files changed, 103 insertions(+), 39 deletions(-)
--- linux-2.6-CH.orig/drivers/base/core.c
+++ linux-2.6-CH/drivers/base/core.c
@@ -365,6 +365,81 @@ static void klist_children_put(struct kl
}
+static int device_add_class_symlinks(struct device *dev)
+{
+ int error;
+
+ if (!dev->class)
+ return 0;
+ error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj,
+ "subsystem");
+ if (error)
+ goto out;
+ /* 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.kset.kobj) {
+ error = sysfs_create_link(&dev->class->subsys.kset.kobj,
+ &dev->kobj, dev->bus_id);
+ if (error)
+ goto out_subsys;
+ }
+#ifdef CONFIG_SYSFS_DEPRECATED
+ if (dev->parent) {
+ char *class_name;
+
+ error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
+ "device");
+ if (error)
+ goto out_busid;
+ class_name = make_class_name(dev->class->name, &dev->kobj);
+ if (!class_name) {
+ error = -ENOMEM;
+ goto out_busid;
+ }
+ error = sysfs_create_link(&dev->parent->kobj, &dev->kobj,
+ class_name);
+ kfree(class_name);
+ if (error)
+ goto out_device;
+ }
+#endif
+ return 0;
+
+#ifdef CONFIG_SYSFS_DEPRECATED
+out_device:
+ if (dev->parent)
+ sysfs_remove_link(&dev->kobj, "device");
+out_busid:
+#endif
+ if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
+ sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id);
+out_subsys:
+ sysfs_remove_link(&dev->kobj, "subsystem");
+out:
+ return error;
+}
+
+static void device_remove_class_symlinks(struct device *dev)
+{
+ if (!dev->class)
+ return;
+#ifdef CONFIG_SYSFS_DEPRECATED
+ if (dev->parent) {
+ char *class_name;
+
+ class_name = make_class_name(dev->class->name, &dev->kobj);
+ if (class_name) {
+ sysfs_remove_link(&dev->parent->kobj, class_name);
+ kfree(class_name);
+ }
+ sysfs_remove_link(&dev->kobj, "device");
+ }
+#endif
+ if (dev->kobj.parent != &dev->class->subsys.kset.kobj)
+ sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id);
+ sysfs_remove_link(&dev->kobj, "subsystem");
+}
+
/**
* device_initialize - init device structure.
* @dev: device.
@@ -449,7 +524,6 @@ static int setup_parent(struct device *d
int device_add(struct device *dev)
{
struct device *parent = NULL;
- char *class_name = NULL;
struct class_interface *class_intf;
int error = -EINVAL;
@@ -510,27 +584,8 @@ int device_add(struct device *dev)
dev->devt_attr = attr;
}
- if (dev->class) {
- sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj,
- "subsystem");
- /* 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.kset.kobj)
- sysfs_create_link(&dev->class->subsys.kset.kobj,
- &dev->kobj, dev->bus_id);
-#ifdef CONFIG_SYSFS_DEPRECATED
- if (parent) {
- sysfs_create_link(&dev->kobj, &dev->parent->kobj,
- "device");
- class_name = make_class_name(dev->class->name,
- &dev->kobj);
- if (class_name)
- sysfs_create_link(&dev->parent->kobj,
- &dev->kobj, class_name);
- }
-#endif
- }
-
+ if ((error = device_add_class_symlinks(dev)))
+ goto SymlinkError;
if ((error = device_add_attrs(dev)))
goto AttrsError;
if ((error = device_add_groups(dev)))
@@ -557,7 +612,6 @@ int device_add(struct device *dev)
up(&dev->class->sem);
}
Done:
- kfree(class_name);
put_device(dev);
return error;
AttachError:
@@ -572,6 +626,8 @@ int device_add(struct device *dev)
GroupError:
device_remove_attrs(dev);
AttrsError:
+ device_remove_class_symlinks(dev);
+ SymlinkError:
if (dev->devt_attr) {
device_remove_file(dev, dev->devt_attr);
kfree(dev->devt_attr);
@@ -911,7 +967,7 @@ int device_rename(struct device *dev, ch
{
char *old_class_name = NULL;
char *new_class_name = NULL;
- char *old_symlink_name = NULL;
+ char *old_device_name = NULL;
int error;
dev = get_device(dev);
@@ -925,25 +981,28 @@ int device_rename(struct device *dev, ch
old_class_name = make_class_name(dev->class->name, &dev->kobj);
#endif
- if (dev->class) {
- old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
- if (!old_symlink_name) {
- error = -ENOMEM;
- goto out_free_old_class;
- }
- strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE);
+ old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
+ if (!old_device_name) {
+ error = -ENOMEM;
+ goto out;
}
-
+ strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE);
strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
error = kobject_rename(&dev->kobj, new_name);
+ if (error) {
+ strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE);
+ goto out;
+ }
#ifdef CONFIG_SYSFS_DEPRECATED
if (old_class_name) {
new_class_name = make_class_name(dev->class->name, &dev->kobj);
if (new_class_name) {
- sysfs_create_link(&dev->parent->kobj, &dev->kobj,
- new_class_name);
+ error = sysfs_create_link(&dev->parent->kobj,
+ &dev->kobj, new_class_name);
+ if (error)
+ goto out;
sysfs_remove_link(&dev->parent->kobj, old_class_name);
}
}
@@ -951,16 +1010,21 @@ int device_rename(struct device *dev, ch
if (dev->class) {
sysfs_remove_link(&dev->class->subsys.kset.kobj,
- old_symlink_name);
- sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj,
- dev->bus_id);
+ old_device_name);
+ error = sysfs_create_link(&dev->class->subsys.kset.kobj,
+ &dev->kobj, dev->bus_id);
+ if (error) {
+ /* Uh... how to unravel this if restoring can fail? */
+ dev_err(dev, "%s: sysfs_create_link failed (%d)\n",
+ __FUNCTION__, error);
+ }
}
+ out:
put_device(dev);
kfree(new_class_name);
- kfree(old_symlink_name);
- out_free_old_class:
kfree(old_class_name);
+ kfree(old_device_name);
return error;
}
-
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