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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-18 11:44:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-18 11:44:53 -0700
commita18d783fedfe6f9b720afe901db9501ce116ed81 (patch)
tree12e100b5b31657d11bfc5dc3e2ddd124f3690cb3 /fs/sysfs
parentd5acba26bfa097a618be425522b1ec4269d3edaf (diff)
parentd2fc88a61b4ea99f574bde16e92718e22f312136 (diff)
Merge tag 'driver-core-4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH: "Here are all of the driver core and related patches for 4.19-rc1. Nothing huge here, just a number of small cleanups and the ability to now stop the deferred probing after init happens. All of these have been in linux-next for a while with only a merge issue reported" * tag 'driver-core-4.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (21 commits) base: core: Remove WARN_ON from link dependencies check drivers/base: stop new probing during shutdown drivers: core: Remove glue dirs from sysfs earlier driver core: remove unnecessary function extern declare sysfs.h: fix non-kernel-doc comment PM / Domains: Stop deferring probe at the end of initcall iommu: Remove IOMMU_OF_DECLARE iommu: Stop deferring probe at end of initcalls pinctrl: Support stopping deferred probe after initcalls dt-bindings: pinctrl: add a 'pinctrl-use-default' property driver core: allow stopping deferred probe after init driver core: add a debugfs entry to show deferred devices sysfs: Fix internal_create_group() for named group updates base: fix order of OF initialization linux/device.h: fix kernel-doc notation warning Documentation: update firmware loader fallback reference kobject: Replace strncpy with memcpy drivers: base: cacheinfo: use OF property_read_u32 instead of get_property,read_number kernfs: Replace strncpy with memcpy device: Add #define dev_fmt similar to #define pr_fmt ...
Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/group.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index c7a716c4acc9..1eb2d6307663 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -124,13 +124,22 @@ static int internal_create_group(struct kobject *kobj, int update,
}
kobject_get_ownership(kobj, &uid, &gid);
if (grp->name) {
- kn = kernfs_create_dir_ns(kobj->sd, grp->name,
- S_IRWXU | S_IRUGO | S_IXUGO,
- uid, gid, kobj, NULL);
- if (IS_ERR(kn)) {
- if (PTR_ERR(kn) == -EEXIST)
- sysfs_warn_dup(kobj->sd, grp->name);
- return PTR_ERR(kn);
+ if (update) {
+ kn = kernfs_find_and_get(kobj->sd, grp->name);
+ if (!kn) {
+ pr_warn("Can't update unknown attr grp name: %s/%s\n",
+ kobj->name, grp->name);
+ return -EINVAL;
+ }
+ } else {
+ kn = kernfs_create_dir_ns(kobj->sd, grp->name,
+ S_IRWXU | S_IRUGO | S_IXUGO,
+ uid, gid, kobj, NULL);
+ if (IS_ERR(kn)) {
+ if (PTR_ERR(kn) == -EEXIST)
+ sysfs_warn_dup(kobj->sd, grp->name);
+ return PTR_ERR(kn);
+ }
}
} else
kn = kobj->sd;
@@ -141,6 +150,10 @@ static int internal_create_group(struct kobject *kobj, int update,
kernfs_remove(kn);
}
kernfs_put(kn);
+
+ if (grp->name && update)
+ kernfs_put(kn);
+
return error;
}
@@ -205,7 +218,8 @@ EXPORT_SYMBOL_GPL(sysfs_create_groups);
* of the attribute files being created already exist. Furthermore,
* if the visibility of the files has changed through the is_visible()
* callback, it will update the permissions and add or remove the
- * relevant files.
+ * relevant files. Changing a group's name (subdirectory name under
+ * kobj's directory in sysfs) is not allowed.
*
* The primary use for this function is to call it after making a change
* that affects group visibility.