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[PATCH] Fix oops in sysfs_hash_and_remove_file() 

The problem arises if an entity in sysfs is created and removed without
ever having been made completely visible.  In SCSI this is triggered by
removing a device while it's initialising.

The problem appears to be that because it was never made visible in sysfs,
the sysfs dentry has a null d_inode which oopses when a reference is made
to it.  The solution is simply to check d_inode and assume the object was
never made visible (and thus doesn't need deleting) if it's NULL.

(akpm: possibly a stopgap for 2.6.13 scsi problems.  May not be the
long-term fix)

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
James Bottomley 2005-08-26 18:34:17 -07:00 committed by Linus Torvalds
parent 657390d25d
commit 36676bcbf9
1 changed files with 4 additions and 0 deletions
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4
fs/sysfs/inode.c
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@ -228,6 +228,10 @@ void sysfs_hash_and_remove(struct dentry * dir, const char * name)
struct sysfs_dirent * sd;
struct sysfs_dirent * parent_sd = dir->d_fsdata;
if (dir->d_inode == NULL)
/* no inode means this hasn't been made visible yet */
return;
down(&dir->d_inode->i_sem);
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
if (!sd->s_element)