[Xen-changelog] [xen stable-4.9] x86/HAP: avoid using bogus/misleading locking

[patchbot@xxxxxxx]

commit 6066be87144e1f7841b3b51279983f83bd46cce5
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jun 13 10:46:13 2017 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jun 13 10:46:13 2017 +0200

    x86/HAP: avoid using bogus/misleading locking
    
    hap_teardown() unconditionally releases the paging lock and is always
    being called without the lock held: Lock acquire should then be
    unconditional too.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Release-acked-by: Julien Grall <julien.grall@xxxxxxx>
    master commit: c9ec0d34e462151d39e0e901b50501db4f6ae78d
    master date: 2017-06-13 10:38:02 +0200
---
 xen/arch/x86/mm/hap/hap.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c
index 8476269..77c7412 100644
--- a/xen/arch/x86/mm/hap/hap.c
+++ b/xen/arch/x86/mm/hap/hap.c
@@ -576,8 +576,7 @@ void hap_teardown(struct domain *d, bool *preempted)
     ASSERT(d->is_dying);
     ASSERT(d != current->domain);
 
-    if ( !paging_locked_by_me(d) )
-        paging_lock(d); /* Keep various asserts happy */
+    paging_lock(d); /* Keep various asserts happy */
 
     if ( paging_mode_enabled(d) )
     {
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.9

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