[pxe] Work around missing PXENV_UNDI_OPEN only when necessary

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/arch/i386/interface/pxe/pxe_undi.c b/src/arch/i386/interface/pxe/pxe_undi.c
index a17b9b3b053bdca8b7c1fc6fa305efd2cdba23fc..29e586ed2a5c180d34fbc870f0e32afc677177af 100644 (file)
--- a/src/arch/i386/interface/pxe/pxe_undi.c
+++ b/src/arch/i386/interface/pxe/pxe_undi.c
@@ -330,8 +330,10 @@ pxenv_undi_transmit ( struct s_PXENV_UNDI_TRANSMIT *undi_transmit ) {
         * processing at this point, to work around callers that never
         * call PXENV_UNDI_OPEN before attempting to use the UNDI API.
         */
-       netdev_rx_freeze ( pxe_netdev );
-       netdev_irq ( pxe_netdev, 1 );
+       if ( ! netdev_rx_frozen ( pxe_netdev ) ) {
+               netdev_rx_freeze ( pxe_netdev );
+               netdev_irq ( pxe_netdev, 1 );
+       }
 
        /* Identify network-layer protocol */
        switch ( undi_transmit->Protocol ) {