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-rw-r--r--fs/namespace.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index cfc6d4448aa5..63fd6d78be27 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -341,8 +341,14 @@ int mnt_want_write(struct vfsmount *mnt)
* incremented count after it has set MNT_WRITE_HOLD.
*/
smp_mb();
- while (mnt->mnt_flags & MNT_WRITE_HOLD)
+ /*
+ * No need to keep preemption disabled accross the spin loop.
+ */
+ while (mnt->mnt_flags & MNT_WRITE_HOLD) {
+ preempt_enable();
cpu_relax();
+ preempt_disable();
+ }
/*
* After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will
* be set to match its requirements. So we must not load that until
@@ -352,9 +358,7 @@ int mnt_want_write(struct vfsmount *mnt)
if (__mnt_is_readonly(mnt)) {
mnt_dec_writers(mnt);
ret = -EROFS;
- goto out;
}
-out:
preempt_enable();
return ret;
}