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KVM: fix crash on irqfd deassign 

irqfd in kvm used flush_work incorrectly: it assumed that work scheduled
previously can't run after flush_work, but since kvm uses a non-reentrant
workqueue (by means of schedule_work) we need flush_work_sync to get that
guarantee.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reported-by: Jean-Philippe Menil <jean-philippe.menil@univ-nantes.fr>
Tested-by: Jean-Philippe Menil <jean-philippe.menil@univ-nantes.fr>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2011-03-17 10:53:33 +02:00 committed by Avi Kivity
parent 6221f222c0
commit 9e02fb9633
1 changed files with 1 additions and 1 deletions
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2
virt/kvm/eventfd.c
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@ -90,7 +90,7 @@ irqfd_shutdown(struct work_struct *work)
* We know no new events will be scheduled at this point, so block
* until all previously outstanding events have completed
*/
flush_work(&irqfd->inject);
flush_work_sync(&irqfd->inject);
/*
* It is now safe to release the object's resources