Something

FATAL: Module firmware_class not found.
Dec 26 15:36:39 kemeny kernel: dahdi: Telephony Interface Registered on major 196
Dec 26 15:36:39 kemeny kernel: dahdi: Version: SVN-trunk-r10384
Dec 26 15:36:39 kemeny kernel: dahdi_echocan_mg2: Registered echo canceler 'MG2'
Dec 26 15:36:39 kemeny kernel: PCI: Enabling device 0000:04:06.0 (0000 -> 0003)
Dec 26 15:36:39 kemeny kernel: ACPI: PCI Interrupt 0000:04:06.0[A] -> GSI 21 (level, low) -> IRQ 66
Dec 26 15:36:41 kemeny kernel: wctdm24xxp 0000:04:06.0: Port 1: Not installed
Dec 26 15:36:41 kemeny kernel: wctdm24xxp 0000:04:06.0: Port 2: Not installed
Dec 26 15:36:41 kemeny kernel: wctdm24xxp 0000:04:06.0: Port 3: Installed -- AUTO FXO (FCC mode)
Dec 26 15:36:41 kemeny kernel: wctdm24xxp 0000:04:06.0: Port 4: Installed -- AUTO FXS/DPO
SETTING FILE PERMISSIONS Asterisk
Permissions Asterisk OK
Starting asterisk:                                         [  OK  ]
[root@kemeny dahdi]# Dec 26 15:36:42 kemeny kernel: wctdm24xxp 0000:04:06.0: Found a Wildcard TDM: Wildcard TDM410P (0 BRI spans, 2 analog channels)
Dec 26 15:36:42 kemeny kernel: BUG: warning at /home/tzafrir/Git/dahdi-linux/drivers/dahdi/wctdm24xxp/base.c:2272/wctdm_fxs_hooksig() (Tainted: GF    )
Dec 26 15:36:42 kemeny kernel:  [<f8ddf309>] wctdm_fxs_hooksig+0xef/0x1fe [wctdm24xxp]
Dec 26 15:36:42 kemeny kernel:  [<f8de5747>] handle_transmit+0x69c/0x17bf [wctdm24xxp]
Dec 26 15:36:42 kemeny kernel:  [<c042ddcb>] do_timer+0x706/0x81c
Dec 26 15:36:42 kemeny kernel:  [<f89c8285>] __ata_qc_complete+0xc2/0xc6 [libata]
Dec 26 15:36:42 kemeny kernel:  [<f8a1f1f8>] vb_tasklet_normal+0x11c/0x431 [dahdi_voicebus]
Dec 26 15:36:42 kemeny kernel:  [<f8a1d1a1>] vb_schedule_deferred+0xe/0xf [dahdi_voicebus]
Dec 26 15:36:42 kemeny kernel:  [<f8a1eb74>] vb_isr+0x9e/0x14f [dahdi_voicebus]
Dec 26 15:36:42 kemeny kernel:  [<c044fed5>] handle_IRQ_event+0x45/0x8c
Dec 26 15:36:42 kemeny kernel:  [<c044ffa0>] __do_IRQ+0x84/0xd6
Dec 26 15:36:42 kemeny kernel:  [<c044ff1c>] __do_IRQ+0x0/0xd6
Dec 26 15:36:42 kemeny kernel:  [<c04074d6>] do_IRQ+0x99/0xc3
Dec 26 15:36:42 kemeny kernel:  [<c040597a>] common_interrupt+0x1a/0x20
Dec 26 15:36:42 kemeny kernel:  [<c0620edc>] _spin_lock+0x3/0xf
Dec 26 15:36:42 kemeny kernel:  [<c0465981>] __pte_alloc+0x21/0x5f
Dec 26 15:36:42 kemeny kernel:  [<c0465a4d>] __handle_mm_fault+0x8e/0xaac
Dec 26 15:36:42 kemeny kernel:  [<c04f0914>] rb_insert_color+0x4c/0xad
Dec 26 15:36:42 kemeny kernel:  [<c046845d>] __vma_link+0x5b/0x68
Dec 26 15:36:42 kemeny kernel:  [<c0468c5f>] vma_link+0x4a/0xb8
Dec 26 15:36:42 kemeny kernel:  [<c046903e>] do_brk+0x1e5/0x211
Dec 26 15:36:42 kemeny kernel:  [<c0622130>] do_page_fault+0x23a/0x52d
Dec 26 15:36:42 kemeny kernel:  [<c0621ef6>] do_page_fault+0x0/0x52d
Dec 26 15:36:42 kemeny kernel:  [<c0405abd>] error_code+0x39/0x40
Dec 26 15:36:42 kemeny kernel:  =======================
Dec 26 15:36:42 kemeny kernel: wctdm24xxp 0000:04:06.0: Missed interrupt. Increasing latency to 5 ms in order to compensate.


Adding debug prints, I could see that 'get_dahdi_chan(wc, mod)->sig' returned 0.