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authorLinus Torvalds <torvalds@linux-foundation.org>2014-04-18 16:59:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-18 16:59:52 -0700
commit60fbf2bda140f27b0e9ab5b6d17342c9a5f9eacf (patch)
tree5ab62db9c538de54d8176439b0adebfff2758d31 /fs
parent8cb652bb10e788270b6b8b6df20fba62b479feb2 (diff)
parent94f8cc0eea03648e5cc5de1a4e7dc464de92cc74 (diff)
Merge tag 'driver-core-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core fixes from Greg KH: "Here are some driver core fixes for 3.15-rc2. Also in here are some documentation updates, as well as an API removal that had to wait for after -rc1 due to the cleanups coming into you from multiple developer trees (this one and the PPC tree.) All have been in linux next successfully" * tag 'driver-core-3.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: drivers/base/dd.c incorrect pr_debug() parameters Documentation: Update stable address in Chinese and Japanese translations topology: Fix compilation warning when not in SMP Chinese: add translation of io_ordering.txt stable_kernel_rules: spelling/word usage sysfs, driver-core: remove unused {sysfs|device}_schedule_callback_owner() kernfs: protect lazy kernfs_iattrs allocation with mutex fs: Don't return 0 from get_anon_bdev
Diffstat (limited to 'fs')
-rw-r--r--fs/kernfs/inode.c14
-rw-r--r--fs/super.c5
-rw-r--r--fs/sysfs/file.c92
3 files changed, 14 insertions, 97 deletions
diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
index abb0f1f53d93..985217626e66 100644
--- a/fs/kernfs/inode.c
+++ b/fs/kernfs/inode.c
@@ -48,14 +48,18 @@ void __init kernfs_inode_init(void)
static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
{
+ static DEFINE_MUTEX(iattr_mutex);
+ struct kernfs_iattrs *ret;
struct iattr *iattrs;
+ mutex_lock(&iattr_mutex);
+
if (kn->iattr)
- return kn->iattr;
+ goto out_unlock;
kn->iattr = kzalloc(sizeof(struct kernfs_iattrs), GFP_KERNEL);
if (!kn->iattr)
- return NULL;
+ goto out_unlock;
iattrs = &kn->iattr->ia_iattr;
/* assign default attributes */
@@ -65,8 +69,10 @@ static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME;
simple_xattrs_init(&kn->iattr->xattrs);
-
- return kn->iattr;
+out_unlock:
+ ret = kn->iattr;
+ mutex_unlock(&iattr_mutex);
+ return ret;
}
static int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr)
diff --git a/fs/super.c b/fs/super.c
index e9dc3c3fe159..48377f7463c0 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -800,7 +800,10 @@ void emergency_remount(void)
static DEFINE_IDA(unnamed_dev_ida);
static DEFINE_SPINLOCK(unnamed_dev_lock);/* protects the above */
-static int unnamed_dev_start = 0; /* don't bother trying below it */
+/* Many userspace utilities consider an FSID of 0 invalid.
+ * Always return at least 1 from get_anon_bdev.
+ */
+static int unnamed_dev_start = 1;
int get_anon_bdev(dev_t *p)
{
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 1b8b91b67fdb..28cc1acd5439 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -453,95 +453,3 @@ void sysfs_remove_bin_file(struct kobject *kobj,
kernfs_remove_by_name(kobj->sd, attr->attr.name);
}
EXPORT_SYMBOL_GPL(sysfs_remove_bin_file);
-
-struct sysfs_schedule_callback_struct {
- struct list_head workq_list;
- struct kobject *kobj;
- void (*func)(void *);
- void *data;
- struct module *owner;
- struct work_struct work;
-};
-
-static struct workqueue_struct *sysfs_workqueue;
-static DEFINE_MUTEX(sysfs_workq_mutex);
-static LIST_HEAD(sysfs_workq);
-static void sysfs_schedule_callback_work(struct work_struct *work)
-{
- struct sysfs_schedule_callback_struct *ss = container_of(work,
- struct sysfs_schedule_callback_struct, work);
-
- (ss->func)(ss->data);
- kobject_put(ss->kobj);
- module_put(ss->owner);
- mutex_lock(&sysfs_workq_mutex);
- list_del(&ss->workq_list);
- mutex_unlock(&sysfs_workq_mutex);
- kfree(ss);
-}
-
-/**
- * sysfs_schedule_callback - helper to schedule a callback for a kobject
- * @kobj: object we're acting for.
- * @func: callback function to invoke later.
- * @data: argument to pass to @func.
- * @owner: module owning the callback code
- *
- * sysfs attribute methods must not unregister themselves or their parent
- * kobject (which would amount to the same thing). Attempts to do so will
- * deadlock, since unregistration is mutually exclusive with driver
- * callbacks.
- *
- * Instead methods can call this routine, which will attempt to allocate
- * and schedule a workqueue request to call back @func with @data as its
- * argument in the workqueue's process context. @kobj will be pinned
- * until @func returns.
- *
- * Returns 0 if the request was submitted, -ENOMEM if storage could not
- * be allocated, -ENODEV if a reference to @owner isn't available,
- * -EAGAIN if a callback has already been scheduled for @kobj.
- */
-int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *),
- void *data, struct module *owner)
-{
- struct sysfs_schedule_callback_struct *ss, *tmp;
-
- if (!try_module_get(owner))
- return -ENODEV;
-
- mutex_lock(&sysfs_workq_mutex);
- list_for_each_entry_safe(ss, tmp, &sysfs_workq, workq_list)
- if (ss->kobj == kobj) {
- module_put(owner);
- mutex_unlock(&sysfs_workq_mutex);
- return -EAGAIN;
- }
- mutex_unlock(&sysfs_workq_mutex);
-
- if (sysfs_workqueue == NULL) {
- sysfs_workqueue = create_singlethread_workqueue("sysfsd");
- if (sysfs_workqueue == NULL) {
- module_put(owner);
- return -ENOMEM;
- }
- }
-
- ss = kmalloc(sizeof(*ss), GFP_KERNEL);
- if (!ss) {
- module_put(owner);
- return -ENOMEM;
- }
- kobject_get(kobj);
- ss->kobj = kobj;
- ss->func = func;
- ss->data = data;
- ss->owner = owner;
- INIT_WORK(&ss->work, sysfs_schedule_callback_work);
- INIT_LIST_HEAD(&ss->workq_list);
- mutex_lock(&sysfs_workq_mutex);
- list_add_tail(&ss->workq_list, &sysfs_workq);
- mutex_unlock(&sysfs_workq_mutex);
- queue_work(sysfs_workqueue, &ss->work);
- return 0;
-}
-EXPORT_SYMBOL_GPL(sysfs_schedule_callback);