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ANDROID: sdcardfs: Remove unnecessary lock

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The mmap_sem lock does not appear to be protecting
anything, and has been removed in Samsung's more
recent versions of sdcardfs.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Change-Id: I76ff3e33002716b8384fc8be368028ed63dffe4e
Bug: 63785372
This commit is contained in:
Daniel Rosenberg 2017-07-19 17:16:43 -07:00 committed by Amit Pundir
parent 2451d7f28d
commit dedbddf5e4
1 changed files with 0 additions and 6 deletions
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6
fs/sdcardfs/inode.c
View file

@ -776,13 +776,9 @@ static int sdcardfs_setattr(struct vfsmount *mnt, struct dentry *dentry, struct
* afterwards in the other cases: we fsstack_copy_inode_size from
* the lower level.
*/
if (current->mm)
down_write(&current->mm->mmap_sem);
if (ia->ia_valid & ATTR_SIZE) {
err = inode_newsize_ok(&tmp, ia->ia_size);
if (err) {
if (current->mm)
up_write(&current->mm->mmap_sem);
goto out;
}
truncate_setsize(inode, ia->ia_size);
@ -805,8 +801,6 @@ static int sdcardfs_setattr(struct vfsmount *mnt, struct dentry *dentry, struct
err = notify_change2(lower_mnt, lower_dentry, &lower_ia, /* note: lower_ia */
NULL);
inode_unlock(d_inode(lower_dentry));
if (current->mm)
up_write(&current->mm->mmap_sem);
if (err)
goto out;