linux-kernel - [PATCH 3.2 34/92] kvm: free resources after canceling async

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Message-ID: <lsq.1402104389.231467087@decadent.org.uk>
Date:	Sat, 07 Jun 2014 02:26:29 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Paolo Bonzini" <pbonzini@...hat.com>,
	"Radim Krčmář" <rkrcmar@...hat.com>,
	"Gleb Natapov" <gleb@...hat.com>
Subject: [PATCH 3.2 34/92] kvm: free resources after canceling async_pf

3.2.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Radim Krčmář <rkrcmar@...hat.com>

commit 28b441e24088081c1e213139d1303b451a34a4f4 upstream.

When we cancel 'async_pf_execute()', we should behave as if the work was
never scheduled in 'kvm_setup_async_pf()'.
Fixes a bug when we can't unload module because the vm wasn't destroyed.

Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
Reviewed-by: Gleb Natapov <gleb@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 virt/kvm/async_pf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -101,8 +101,11 @@ void kvm_clear_async_pf_completion_queue
 				   typeof(*work), queue);
 		cancel_work_sync(&work->work);
 		list_del(&work->queue);
-		if (!work->done) /* work was canceled */
+		if (!work->done) { /* work was canceled */
+			mmdrop(work->mm);
+			kvm_put_kvm(vcpu->kvm); /* == work->vcpu->kvm */
 			kmem_cache_free(async_pf_cache, work);
+		}
 	}
 
 	spin_lock(&vcpu->async_pf.lock);

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