xen: xenbus: Catch closing of non existent transactions
Users of the xenbus functions should never close a non existent transaction (for example by trying to closing the same transaction twice) but better catch it in xs_request_exit() than to corrupt the reference counter. Signed-off-by: Simon Gaiser <simon@invisiblethingslab.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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@ -140,7 +140,9 @@ void xs_request_exit(struct xb_req_data *req)
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spin_lock(&xs_state_lock);
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xs_state_users--;
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if ((req->type == XS_TRANSACTION_START && req->msg.type == XS_ERROR) ||
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req->type == XS_TRANSACTION_END)
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(req->type == XS_TRANSACTION_END &&
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!WARN_ON_ONCE(req->msg.type == XS_ERROR &&
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!strcmp(req->body, "ENOENT"))))
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xs_state_users--;
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spin_unlock(&xs_state_lock);
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