afs: Fix double inc of vnode->cb_break

When __afs_break_callback() clears the CB_PROMISED flag, it increments
vnode->cb_break to trigger a future refetch of the status and callback -
however it also calls afs_clear_permits(), which also increments
vnode->cb_break.

Fix this by removing the increment from afs_clear_permits().

Whilst we're at it, fix the conditional call to afs_put_permits() as the
function checks to see if the argument is NULL, so the check is redundant.

Fixes: be080a6f43c4 ("afs: Overhaul permit caching");
Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/fs/afs/security.c b/fs/afs/security.c
index 5f58a9a17e69..db5529e47eb8 100644
--- a/fs/afs/security.c
+++ b/fs/afs/security.c
@@ -87,11 +87,9 @@ void afs_clear_permits(struct afs_vnode *vnode)
         permits = rcu_dereference_protected(vnode->permit_cache,
                                             lockdep_is_held(&vnode->lock));
         RCU_INIT_POINTER(vnode->permit_cache, NULL);
-        vnode->cb_break++;
         spin_unlock(&vnode->lock);
 
-        if (permits)
-                afs_put_permits(permits);
+        afs_put_permits(permits);
 }
 
 /*