From fd711586bb7d63f257da5eff234e68c446ac35ea Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Fri, 10 May 2019 23:14:41 +0100
Subject: [PATCH] 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>
---
fs/afs/security.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/afs/security.c b/fs/afs/security.c
index 5f58a9a17e694..db5529e47eb80 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);
}
/*
--
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