* Kay Sievers <[email protected]> wrote:
> > > > > + sa->attr.owner = NULL;
> > > > > sa->attr.name = name;
> > > >
> > > > i'm wondering why doesnt this affect 2.6.23 and later? Does sysfs
> > > > initialize the owner field to NULL automatically?
> > >
> > > Attibutes do not have an owner anymore:
> > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7b595756ec1f49e0049a9e01a1298d53a7faaa15
> >
> > This one also fails to apply properly at the exact same place has
> > Ingo's previously posted patch. Would need to backport his one.
>
> It depends on a completely reworked sysfs logic, I don't think it
> makes any sense to backport that.
well, if it fixes a live bug in a still supported stable kernel
release...
Vincent, could you try to just get rid of all actual uses of
se->attr.owner, within fs/sysfs/*.c? Something like the patch below.
(totally untested - might be fatally broken as well)
Ingo
---
fs/sysfs/bin.c | 7 -------
fs/sysfs/file.c | 13 -------------
2 files changed, 20 deletions(-)
Index: linux-cfs-2.6.22.13.q/fs/sysfs/bin.c
===================================================================
--- linux-cfs-2.6.22.13.q.orig/fs/sysfs/bin.c
+++ linux-cfs-2.6.22.13.q/fs/sysfs/bin.c
@@ -125,11 +125,6 @@ static int open(struct inode * inode, st
if (!kobj || !attr)
goto Done;
- /* Grab the module reference for this attribute if we have one */
- error = -ENODEV;
- if (!try_module_get(attr->attr.owner))
- goto Done;
-
error = -EACCES;
if ((file->f_mode & FMODE_WRITE) && !(attr->write || attr->mmap))
goto Error;
@@ -145,7 +140,6 @@ static int open(struct inode * inode, st
goto Done;
Error:
- module_put(attr->attr.owner);
Done:
if (error)
kobject_put(kobj);
@@ -159,7 +153,6 @@ static int release(struct inode * inode,
u8 * buffer = file->private_data;
kobject_put(kobj);
- module_put(attr->attr.owner);
kfree(buffer);
return 0;
}
Index: linux-cfs-2.6.22.13.q/fs/sysfs/file.c
===================================================================
--- linux-cfs-2.6.22.13.q.orig/fs/sysfs/file.c
+++ linux-cfs-2.6.22.13.q/fs/sysfs/file.c
@@ -257,12 +257,6 @@ static int sysfs_open_file(struct inode
if (!kobj || !attr)
goto Einval;
- /* Grab the module reference for this attribute if we have one */
- if (!try_module_get(attr->owner)) {
- error = -ENODEV;
- goto Done;
- }
-
/* if the kobject has no ktype, then we assume that it is a subsystem
* itself, and use ops for it.
*/
@@ -332,7 +326,6 @@ static int sysfs_open_file(struct inode
goto Done;
Eaccess:
error = -EACCES;
- module_put(attr->owner);
Done:
if (error)
kobject_put(kobj);
@@ -343,14 +336,12 @@ static int sysfs_release(struct inode *
{
struct kobject * kobj = to_kobj(filp->f_path.dentry->d_parent);
struct attribute * attr = to_attr(filp->f_path.dentry);
- struct module * owner = attr->owner;
struct sysfs_buffer * buffer = filp->private_data;
if (buffer)
remove_from_collection(buffer, inode);
kobject_put(kobj);
/* After this point, attr should not be accessed. */
- module_put(owner);
if (buffer) {
if (buffer->page)
@@ -615,7 +606,6 @@ static void sysfs_schedule_callback_work
(ss->func)(ss->data);
kobject_put(ss->kobj);
- module_put(ss->owner);
kfree(ss);
}
@@ -644,11 +634,8 @@ int sysfs_schedule_callback(struct kobje
{
struct sysfs_schedule_callback_struct *ss;
- if (!try_module_get(owner))
- return -ENODEV;
ss = kmalloc(sizeof(*ss), GFP_KERNEL);
if (!ss) {
- module_put(owner);
return -ENOMEM;
}
kobject_get(kobj);
--
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