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Message-ID: <20060724190052.6599d0fb@gondolin.boeblingen.de.ibm.com>
Date: Mon, 24 Jul 2006 19:00:52 +0200
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: Andrew Morton <akpm@...l.org>
Cc: linux-kernel@...r.kernel.org, Greg K-H <greg@...ah.com>
Subject: [Patch] [mm] Yet further driver core fixes for -mm
This patch goes on top of the previous one and attempts to fix some
more problems in the driver core. These should contain most of the
low-hanging fruit for now...
These patches probably could use some testing by someone else but me :)
--
Cornelia Huck
Linux for zSeries Developer
Tel.: +49-7031-16-4837, Mail: cornelia.huck@...ibm.com
From: Cornelia Huck <cornelia.huck@...ibm.com>
Some more fixes in the driver core:
- make_class_name() returns an ERR_PTR on error, not NULL.
- fixup some more unwinding on errors.
CC: Greg K-H <greg@...ah.com>
Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
bus.c | 24 +++++++++++++++++++-----
class.c | 5 ++++-
core.c | 46 ++++++++++++++++++++++++++++------------------
platform.c | 29 ++++++++++++++++++-----------
4 files changed, 69 insertions(+), 35 deletions(-)
diff -Naurp linux-2.6.18-rc1-mm2/drivers/base/bus.c linux-2.6.18-rc1-mm2+CH/drivers/base/bus.c
--- linux-2.6.18-rc1-mm2/drivers/base/bus.c 2006-07-24 12:59:29.000000000 +0200
+++ linux-2.6.18-rc1-mm2+CH/drivers/base/bus.c 2006-07-24 18:31:36.000000000 +0200
@@ -372,18 +372,28 @@ int bus_add_device(struct device * dev)
pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
error = device_add_attrs(bus, dev);
if (error)
- goto out;
+ goto out_put;
error = sysfs_create_link(&bus->devices.kobj,
&dev->kobj, dev->bus_id);
if (error)
- goto out;
+ goto out_id;
error = sysfs_create_link(&dev->kobj,
&dev->bus->subsys.kset.kobj, "subsystem");
if (error)
- goto out;
+ goto out_subsys;
error = sysfs_create_link(&dev->kobj,
&dev->bus->subsys.kset.kobj, "bus");
- }
+ if (!error)
+ goto out;
+ } else
+ goto out;
+ sysfs_remove_link(&dev->kobj, "subsystem");
+out_subsys:
+ sysfs_remove_link(&bus->devices.kobj, dev->bus_id);
+out_id:
+ device_remove_attrs(bus, dev);
+out_put:
+ put_bus(dev->bus);
out:
return error;
}
@@ -760,11 +770,15 @@ int bus_register(struct bus_type * bus)
klist_init(&bus->klist_devices, klist_devices_get, klist_devices_put);
klist_init(&bus->klist_drivers, klist_drivers_get, klist_drivers_put);
- bus_add_attrs(bus);
+ retval = bus_add_attrs(bus);
+ if (retval)
+ goto bus_attrs_fail;
pr_debug("bus type '%s' registered\n", bus->name);
return 0;
+bus_attrs_fail:
+ kset_unregister(&bus->drivers);
bus_drivers_fail:
kset_unregister(&bus->devices);
bus_devices_fail:
diff -Naurp linux-2.6.18-rc1-mm2/drivers/base/class.c linux-2.6.18-rc1-mm2+CH/drivers/base/class.c
--- linux-2.6.18-rc1-mm2/drivers/base/class.c 2006-07-24 12:59:29.000000000 +0200
+++ linux-2.6.18-rc1-mm2+CH/drivers/base/class.c 2006-07-24 15:58:39.000000000 +0200
@@ -153,7 +153,10 @@ int class_register(struct class * cls)
error = subsystem_register(&cls->subsys);
if (!error) {
error = add_class_attrs(class_get(cls));
- class_put(cls);
+ if (error)
+ subsystem_unregister(&cls->subsys);
+ else
+ class_put(cls);
}
return error;
}
diff -Naurp linux-2.6.18-rc1-mm2/drivers/base/core.c linux-2.6.18-rc1-mm2+CH/drivers/base/core.c
--- linux-2.6.18-rc1-mm2/drivers/base/core.c 2006-07-24 12:59:29.000000000 +0200
+++ linux-2.6.18-rc1-mm2+CH/drivers/base/core.c 2006-07-24 18:24:42.000000000 +0200
@@ -804,7 +804,7 @@ 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);
@@ -813,33 +813,43 @@ int device_rename(struct device *dev, ch
pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name);
- if ((dev->class) && (dev->parent))
+ if ((dev->class) && (dev->parent)) {
old_class_name = make_class_name(dev->class->name, &dev->kobj);
-
- if (dev->class) {
- old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
- if (!old_symlink_name)
- return -ENOMEM;
- strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE);
+ if (IS_ERR(old_class_name)) {
+ error = PTR_ERR(old_class_name);
+ old_class_name = NULL;
+ goto out;
+ }
}
-
+ 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;
+ }
if (old_class_name) {
new_class_name = make_class_name(dev->class->name, &dev->kobj);
- if (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);
+ if (IS_ERR(new_class_name)) {
+ error = PTR_ERR(new_class_name);
+ new_class_name = NULL;
+ goto out;
}
+ 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);
}
if (dev->class) {
sysfs_remove_link(&dev->class->subsys.kset.kobj,
- old_symlink_name);
+ old_device_name);
error = sysfs_create_link(&dev->class->subsys.kset.kobj,
&dev->kobj, dev->bus_id);
if (error) {
@@ -853,7 +863,7 @@ out:
kfree(old_class_name);
kfree(new_class_name);
- kfree(old_symlink_name);
+ kfree(old_device_name);
return error;
}
diff -Naurp linux-2.6.18-rc1-mm2/drivers/base/platform.c linux-2.6.18-rc1-mm2+CH/drivers/base/platform.c
--- linux-2.6.18-rc1-mm2/drivers/base/platform.c 2006-07-24 12:59:29.000000000 +0200
+++ linux-2.6.18-rc1-mm2+CH/drivers/base/platform.c 2006-07-24 15:39:07.000000000 +0200
@@ -202,6 +202,17 @@ int platform_device_add_resources(struct
}
EXPORT_SYMBOL_GPL(platform_device_add_resources);
+static void platform_device_del_resources(struct platform_device *pdev)
+{
+ int i;
+
+ for (i = 0; i < pdev->num_resources; i++) {
+ struct resource *r = &pdev->resource[i];
+ if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO))
+ release_resource(r);
+ }
+}
+
/**
* platform_device_add_data
* @pdev: platform device allocated by platform_device_alloc to add resources to
@@ -296,15 +307,8 @@ EXPORT_SYMBOL_GPL(platform_device_add);
*/
void platform_device_del(struct platform_device *pdev)
{
- int i;
-
if (pdev) {
- for (i = 0; i < pdev->num_resources; i++) {
- struct resource *r = &pdev->resource[i];
- if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO))
- release_resource(r);
- }
-
+ platform_device_del_resources(pdev);
device_del(&pdev->dev);
}
}
@@ -365,17 +369,20 @@ struct platform_device *platform_device_
if (num) {
retval = platform_device_add_resources(pdev, res, num);
if (retval)
- goto error;
+ goto error_put;
}
retval = platform_device_add(pdev);
if (retval)
- goto error;
+ goto error_resources;
return pdev;
-error:
+error_resources:
+ platform_device_del_resources(pdev);
+error_put:
platform_device_put(pdev);
+error:
return ERR_PTR(retval);
}
EXPORT_SYMBOL_GPL(platform_device_register_simple);
-
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