In some cases a request may be canceled before the completion callback runs. Keep a reference to the request between starting an AIO operation and the corresponding scsi_req_cancel or scsi_*_complete. When a request has to be retried, the request can be dropped because scsi_dma_restart_bh only looks at requests that are enqueued. As such, they always have at least a reference. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Read the documentation in qemu-doc.html. Fabrice Bellard.
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