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When CONSOLE_SYSLOG is used, a DBG() from within a network device driver may cause its transmit() or poll() methods to be unexpectedly re-entered. Since these methods are not intended to be re-entrant, this can lead to undefined behaviour. Add an explicit re-entrancy guard to both methods. Note that this must operate at a per-netdevice level, since there are legitimate circumstances under which the netdev_tx() or netdev_poll() functions may be re-entered (e.g. when using VLAN devices). Signed-off-by: Michael Brown <mcb30@ipxe.org>
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