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Driver core fixes for 4.8-rc5 

Here are 3 small fixes for 4.8-rc5.
 
 One for sysfs, one for kernfs, and one documentation fix, all for
 reported issues.  All of these have been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-4.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here are three small fixes for 4.8-rc5.

  One for sysfs, one for kernfs, and one documentation fix, all for
  reported issues.  All of these have been in linux-next for a while"

* tag 'driver-core-4.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  sysfs: correctly handle read offset on PREALLOC attrs
  documentation: drivers/core/of: fix name of of_node symlink
  kernfs: don't depend on d_find_any_alias() when generating notifications
This commit is contained in:
Linus Torvalds 2016-09-03 11:36:55 -07:00
parent 018c81b827 17d0774f80
commit 41488202f1
3 changed files with 29 additions and 9 deletions
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2
Documentation/ABI/stable/sysfs-devices
View File

@ -1,7 +1,7 @@
# Note: This documents additional properties of any device beyond what
# is documented in Documentation/sysfs-rules.txt
What: /sys/devices/*/of_path
What: /sys/devices/*/of_node
Date: February 2015
Contact: Device Tree mailing list <devicetree@vger.kernel.org>
Description:

28
fs/kernfs/file.c
View File

@ -840,21 +840,35 @@ static void kernfs_notify_workfn(struct work_struct *work)
mutex_lock(&kernfs_mutex);
list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
struct kernfs_node *parent;
struct inode *inode;
struct dentry *dentry;
/*
* We want fsnotify_modify() on @kn but as the
* modifications aren't originating from userland don't
* have the matching @file available. Look up the inodes
* and generate the events manually.
*/
inode = ilookup(info->sb, kn->ino);
if (!inode)
continue;
dentry = d_find_any_alias(inode);
if (dentry) {
fsnotify_parent(NULL, dentry, FS_MODIFY);
fsnotify(inode, FS_MODIFY, inode, FSNOTIFY_EVENT_INODE,
NULL, 0);
dput(dentry);
parent = kernfs_get_parent(kn);
if (parent) {
struct inode *p_inode;
p_inode = ilookup(info->sb, parent->ino);
if (p_inode) {
fsnotify(p_inode, FS_MODIFY | FS_EVENT_ON_CHILD,
inode, FSNOTIFY_EVENT_INODE, kn->name, 0);
iput(p_inode);
}
kernfs_put(parent);
}
fsnotify(inode, FS_MODIFY, inode, FSNOTIFY_EVENT_INODE,
kn->name, 0);
iput(inode);
}

8
fs/sysfs/file.c
View File

@ -114,9 +114,15 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
* If buf != of->prealloc_buf, we don't know how
* large it is, so cannot safely pass it to ->show
*/
if (pos || WARN_ON_ONCE(buf != of->prealloc_buf))
if (WARN_ON_ONCE(buf != of->prealloc_buf))
return 0;
len = ops->show(kobj, of->kn->priv, buf);
if (pos) {
if (len <= pos)
return 0;
len -= pos;
memmove(buf, buf + pos, len);
}
return min(count, len);
}