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authorSheng Yang <sheng@linux.intel.com>2009-12-15 10:28:07 +0800
committerMarcelo Tosatti <mtosatti@redhat.com>2009-12-27 13:36:31 -0200
commitfae3a3536a6fecedebd49fa847f810e599bfb132 (patch)
tree18b555c3f6bcc6735fd7a90db2c398a35e29c84e /virt/kvm/kvm_main.c
parentfb341f572d26e0786167cd96b90cc4febed830cf (diff)
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KVM: Fix possible circular locking in kvm_vm_ioctl_assign_device()
One possible order is: KVM_CREATE_IRQCHIP ioctl(took kvm->lock) -> kvm_iobus_register_dev() -> down_write(kvm->slots_lock). The other one is in kvm_vm_ioctl_assign_device(), which take kvm->slots_lock first, then kvm->lock. Update the comment of lock order as well. Observe it due to kernel locking debug warnings. Cc: stable@kernel.org Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index b5af8816761..7db071ba466 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -64,7 +64,7 @@ MODULE_LICENSE("GPL");
/*
* Ordering of locks:
*
- * kvm->slots_lock --> kvm->lock --> kvm->irq_lock
+ * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
*/
DEFINE_SPINLOCK(kvm_lock);