ACM USB modem on Kernel 2.6.0-test
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Quoted 9 lines · Peter Matthias
Quoted 7 lines · David Brownell
Quoted 5 lines · David Brownell
Hmm ... maybe usbcore would be better off with a less naive algorithm for choosing defaults. Like, preferring configurations without proprietary device protocols. That'd solve every cdc-acm case, and likely others.
Quoted 5 lines
Quoted 3 lines
In fact, here's a patch with that very change. Does it make current 2.6.0-test kernels work "out of the box" again with your USB modems?
Yes, it works with ELSA Microlink USB. Thanks.
Hmm. Too early. I get either a "acm: probe of 3-3:2.1 failed with error -5" but it works or a
Unable to handle kernel NULL pointer dereference at virtual address 00000008
printing eip:
c023d9c3
*pde = 00000000
Oops: 0000 [#1]
CPU: 0
EIP: 0060:[usb_driver_claim_interface+67/112] Tainted: P
EFLAGS: 00010202
EIP is at usb_driver_claim_interface+0x43/0x70
eax: c02ffe72 ebx: dddcf200 ecx: 00000004 edx: dddfa2ec
esi: dddfa120 edi: 00000000 ebp: dddce3c0 esp: c15b1dd8
ds: 007b es: 007b ss: 0068
Process khubd (pid: 5, threadinfo=c15b0000 task=ddf8e040)
Stack: c030a460 c02ff409 c02ffe72 00001388 dddcf200 c025141c c033a8e0
dddfa2ec
dddce3c0 dddce3d8 00000007 00000094 dddcf200 00000000 00000020
dddfa120
c1796ac0 c1796ad4 dddddc00 c033a968 c033a900 c033a8e0 dddfa240
c023d713
Call Trace:
[acm_probe+1228/1408] acm_probe+0x4cc/0x580
[usb_probe_interface+115/160] usb_probe_interface+0x73/0xa0
[bus_match+63/112] bus_match+0x3f/0x70
[device_attach+65/160] device_attach+0x41/0xa0
[bus_add_device+91/160] bus_add_device+0x5b/0xa0
[device_add+167/272] device_add+0xa7/0x110
[usb_set_configuration+456/576] usb_set_configuration+0x1c8/0x240
[usb_new_device+690/992] usb_new_device+0x2b2/0x3e0
[hub_port_connect_change+461/816] hub_port_connect_change+0x1cd/0x330
[hub_events+773/848] hub_events+0x305/0x350
[hub_thread+53/224] hub_thread+0x35/0xe0
[default_wake_function+0/48] default_wake_function+0x0/0x30
[hub_thread+0/224] hub_thread+0x0/0xe0
[kernel_thread_helper+5/12] kernel_thread_helper+0x5/0xc
Code: 8b 41 04 89 54 24 10 89 44 24 0c e8 1d b6 ed ff b8 f0 ff ffPeter