debugnet: fix an errant assertion
We may call debugnet_free() before g_debugnet_pcb_inuse is true, specifically in the cases where the interface is down or does not support debugnet. pcb->dp_drv_input is used to hold the real driver if_input callback while debugnet is in use, so we can check the status of this field in the assertion. This can be triggered trivially by trying to configure netdump on an unsupported interface at the ddb prompt. Initializing the dp_drv_input field to NULL explicitly is not necessary but helps display the intent. PR: 263929 Reported by: Martin Filla <freebsd@sysctl.cz> Reviewed by: cem, markj MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D35179
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@ -605,8 +605,8 @@ debugnet_free(struct debugnet_pcb *pcb)
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{
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struct ifnet *ifp;
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MPASS(g_debugnet_pcb_inuse);
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MPASS(pcb == &g_dnet_pcb);
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MPASS(pcb->dp_drv_input == NULL || g_debugnet_pcb_inuse);
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ifp = pcb->dp_ifp;
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if (ifp != NULL) {
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@ -646,6 +646,7 @@ debugnet_connect(const struct debugnet_conn_params *dcp,
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.dp_seqno = 1,
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.dp_ifp = dcp->dc_ifp,
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.dp_rx_handler = dcp->dc_rx_handler,
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.dp_drv_input = NULL,
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};
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/* Switch to the debugnet mbuf zones. */
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