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SubjectRe: [PATCH] More Driver Core patches for 2.6.10-rc1
Date
From
ChangeSet 1.2462, 2004/11/04 14:44:35-08:00, maneesh@in.ibm.com

[PATCH] fix kernel BUG at fs/sysfs/dir.c:20!

On Thu, Nov 04, 2004 at 12:52:38PM -0800, Greg KH wrote:
> Hi,
>
> I get the following BUG in the sysfs code when I do:
> - plug in a usb-serial device.
> - open the port with 'cat /dev/ttyUSB0'
> - unplug the device.
> - stop the 'cat' process with control-C
>
> This used to work just fine before your big sysfs changes.

There is a similar problem reported by s390 people where we see parent
kobject (directory) going away before child kobject (sub-directory). It
seems kobject code is able to handle this, but not the sysfs. What could
be happening that in sysfs_remove_dir() of parent directory, we try to
remove its contents. It works well with the regular files as it is the
final removal for sysfs_dirent corresponding to the files. But in case
of sub-directory we are doing an extra sysfs_put(). Once while removing
parent and the other one being the one from when sysfs_remove_dir() is
called for the child.

The following patch worked for the s390 people, I hope same will work in
this case also.


o Do not remove sysfs_dirents corresponding to the sub-directory in
sysfs_remove_dir(). They will be removed in the sysfs_remove_dir() call
for the specific sub-directory.

Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>


fs/sysfs/dir.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)


diff -Nru a/fs/sysfs/dir.c b/fs/sysfs/dir.c
--- a/fs/sysfs/dir.c 2004-11-04 16:29:54 -08:00
+++ b/fs/sysfs/dir.c 2004-11-04 16:29:54 -08:00
@@ -277,7 +277,7 @@
pr_debug("sysfs %s: removing dir\n",dentry->d_name.name);
down(&dentry->d_inode->i_sem);
list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) {
- if (!sd->s_element)
+ if (!sd->s_element || !(sd->s_type & SYSFS_NOT_PINNED))
continue;
list_del_init(&sd->s_sibling);
sysfs_drop_dentry(sd, dentry);
-
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