Dotaz: Menici se USB zarizeni

[Pepajz]

Cau mam problem s udev na MDK 10, vanilla jadro 2.6.10, a misto devfs jsem nainstaloval udev. Do USB pripojuju modem GPC640 (tzn. cdma), vytvori se zarizeni /udev/ttyACM0 vytocim a modem se spoji.

Mar  5 22:34:15 localhost kernel: usb 1-1: new full speed USB device using ohci_hcd and address 2
Mar  5 22:34:15 localhost kernel: cdc_acm 1-1:1.0: ttyACM0: USB ACM device
Mar  5 22:34:15 localhost udev[2276]: creating device node '/udev/ttyACM0'
Mar  5 22:34:31 localhost kernel: CSLIP: code copyright 1989 Regents of the University of California
Mar  5 22:34:31 localhost kernel: PPP generic driver version 2.4.2
Mar  5 22:34:31 localhost pppd[2297]: pppd 2.4.1 started by root, uid 0
Mar  5 22:34:31 localhost udev[2300]: creating device node '/udev/ppp'
Mar  5 22:34:32 localhost pppd[2297]: Serial connection established.
Mar  5 22:34:33 localhost pppd[2297]: Using interface ppp0
Mar  5 22:34:33 localhost pppd[2297]: Connect: ppp0 <--> /dev/ttyACM0
Mar  5 22:34:37 localhost pppd[2297]: Remote message: ok
Mar  5 22:34:37 localhost kernel: PPP BSD Compression module registered
Mar  5 22:34:38 localhost pppd[2297]: local  IP address 10.166.239.2
Mar  5 22:34:38 localhost pppd[2297]: remote IP address 10.164.4.6
Mar  5 22:34:38 localhost pppd[2297]: primary   DNS address 160.218.10.200
Mar  5 22:34:38 localhost pppd[2297]: secondary DNS address 160.218.43.200

Problem je v tom, ze modem v ruzne dlouhych intervalech resetuje USB (zjistl jsem ze to je evivalentni k vysunuti a zanuti USB konetoru od modemu):

Mar  5 22:34:49 localhost kernel: usb 1-1: USB disconnect, address 2
Mar  5 22:34:49 localhost pppd[2297]: Hangup (SIGHUP)
Mar  5 22:34:49 localhost pppd[2297]: Modem hangup
Mar  5 22:34:49 localhost pppd[2297]: Connection terminated.
Mar  5 22:34:49 localhost pppd[2297]: Connect time 0.3 minutes.
Mar  5 22:34:49 localhost pppd[2297]: Sent 14568 bytes, received 486225 bytes. 

Po tomto resetu to na kozoli a do logu vyhodi:

Mar  5 22:34:49 localhost kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000000
Mar  5 22:34:49 localhost kernel:  printing eip:
Mar  5 22:34:49 localhost kernel: c019b751
Mar  5 22:34:49 localhost kernel: *pde = 00000000
Mar  5 22:34:49 localhost kernel: Oops: 0000 [#1]
Mar  5 22:34:49 localhost kernel: Modules linked in: bsd_comp ppp_async crc_ccitt ppp_generic slhc
iptable_mangle ipt_REDIRECT ipt_MASQUERADE iptable_nat ip_conntrack ip_tables af_packet floppy
8139too mii cdc_acm ohci_hcd usbcore genrtc ext3 jbd
Mar  5 22:34:49 localhost kernel: CPU:    0
Mar  5 22:34:49 localhost kernel: EIP:    0060:[c019b751]    Not tainted VLI
Mar  5 22:34:49 localhost kernel: EFLAGS: 00010246   (2.6.10) 
Mar  5 22:34:49 localhost kernel: EIP is at get_kobj_path_length+0x19/0x34
Mar  5 22:34:49 localhost kernel: eax: 00000000   ebx: 00000000   ecx: ffffffff   edx: c4b7b0d8
Mar  5 22:34:49 localhost kernel: esi: 00000001   edi: 00000000   ebp: c20d7d7c   esp: c20d7d70
Mar  5 22:34:49 localhost kernel: ds: 007b   es: 007b   ss: 0068
Mar  5 22:34:49 localhost kernel: Process pppd (pid: 2297, threadinfo=c20d6000 task=c20b1580)
Mar  5 22:34:49 localhost kernel: Stack: 000000d0 c4b7b0b4 c031f94c c20d7d94 c019b7ca c4b7b0d8 c40e0278 c4b7b0b4 
Mar  5 22:34:49 localhost kernel:        c031f94c c20d7dc8 c01ef483 c4b7b0d8 000000d0 c37fd053 c40e0260 c031f94c 
Mar  5 22:34:49 localhost kernel:        c20d7dd8 c20d7dc8 00000000 c40e086c 00000000 00000000 c20d7e1c c019c307 
Mar  5 22:34:49 localhost kernel: Call Trace:
Mar  5 22:34:49 localhost kernel:  [c0102703] show_stack+0x83/0x90
Mar  5 22:34:49 localhost kernel:  [c0102842] show_registers+0x112/0x184
Mar  5 22:34:49 localhost kernel:  [c0102a02] die+0xc6/0x140
Mar  5 22:34:49 localhost kernel:  [c010db03] do_page_fault+0x48f/0x60b
Mar  5 22:34:49 localhost kernel:  [c010235b] error_code+0x2b/0x30
Mar  5 22:34:49 localhost kernel:  [c019b7ca] kobject_get_path+0x12/0x5c
Mar  5 22:34:49 localhost kernel:  [c01ef483] class_hotplug+0x43/0x120
Mar  5 22:34:49 localhost kernel:  [c019c307] kobject_hotplug+0x1c3/0x250
Mar  5 22:34:49 localhost kernel:  [c019bae3] kobject_del+0xf/0x24
Mar  5 22:34:49 localhost kernel:  [c01ef876] class_device_del+0x9a/0xb4
Mar  5 22:34:49 localhost kernel:  [c01ef89d] class_device_unregister+0xd/0x1c
Mar  5 22:34:49 localhost kernel:  [c01efd70] class_simple_device_remove+0x60/0x70
Mar  5 22:34:49 localhost kernel:  [c01d7388] tty_unregister_device+0x30/0x3c
Mar  5 22:34:49 localhost kernel:  [c6822442] acm_tty_close+0x9a/0xe4 [cdc_acm]
Mar  5 22:34:49 localhost kernel:  [c01d5898] release_dev+0x230/0x688
Mar  5 22:34:49 localhost kernel:  [c01d60d8] tty_release+0xc/0x18
Mar  5 22:34:49 localhost kernel:  [c014201b] __fput+0x4f/0xf0
Mar  5 22:34:49 localhost kernel:  [c0141fc6] fput+0x16/0x1c
Mar  5 22:34:49 localhost kernel:  [c0140dcf] filp_close+0x63/0x70
Mar  5 22:34:49 localhost kernel:  [c0140e27] sys_close+0x4b/0x60
Mar  5 22:34:49 localhost kernel:  [c01020f7] syscall_call+0x7/0xb
Mar  5 22:34:49 localhost kernel: Code: ff 83 c4 04 8d 65 f8 89 d8 5b 5e 89 ec 5d c3 8d 76 00
55 89 e5 57 56 53 be 01 00 00 00 31 db 8b 55 08 8b 3a b9
ff ff ff ff 89 d8 f2 ae f7 d1 49
8b 52 24 8d 74 31 01 85 d2 75 e7 89 f0 5b 5e 5f 

Pak se vytvori nove zarizeni, tentokrat ale /udev/ttyACM1 a i kdyz ttyACM0 tim padem uz neni aktivni stale ale existuje v /udev/ttyACM0

Mar  5 22:34:52 localhost kernel:  <6>usb 1-1: new full speed USB device using ohci_hcd and address 3
Mar  5 22:34:52 localhost kernel: cdc_acm 1-1:1.0: ttyACM1: USB ACM device
Mar  5 22:34:52 localhost udev[2374]: creating device node '/udev/ttyACM1'
Mar  5 22:35:07 localhost pppd[2378]: pppd 2.4.1 started by root, uid 0 

no a to je vsechno, dal uz pppd do logu nic nehlasi, pokud dam pppd vytoci znova tak:

Mar  5 22:35:58 localhost pppd[2412]: pppd 2.4.1 started by root, uid 0
Mar  5 22:35:58 localhost pppd[2412]: Device ttyACM1 is locked by pid 2378
Mar  5 22:35:58 localhost pppd[2412]: Exit. 

tzn. ze pppd to zarizeni echce pustit a i kdyz dam killall pppd tak se pppd stejne nechce ukoncit..

Nejde o nejak udelat tak, aby se to zarizeni vubec pri resetu nemenilo popr. to vyresit jinak?

Odpovědi

[jm]

Hmm, a co treba resit pricinu a ne nasledky a ten modem reklamovat?

[Pepa]

Muzu s lidem rici ze to delaji vsechny ty smejdove modemy... zkusil jsem uz 3... mimochodem kdyz jsem to zkousel na jinem PC s devfs, zarizeni se sice menilo ale slo vytocit pres ttyACM0 i ttyACM1

[wake]

co si v udev rules nastavit pevny symlink a v aplikacich pristupovat pres nej ?

[jm]

To myslim ze nepomuze, protoze si tam pppd vytvori zamek stejne. Leda napsat nejakej skript, aby si pppd ten zamek pri spusteni smazal, kdyz ten sikmovokej kram pokazdy chcipne.

[wake]

no, ppp se AFAIK odmyka, kdyz pada... ale to musi spadnout. takze spis do udev prip. hotplug (a ted varim z vody ;) preup a postdown scripty na zarizeni... takhle mi to chodi tedy ne s modemem ale s iPAQ/familiar ;). Bohuzel ted nejsem u stroje abych to moh postnout.

[Pepa]

jj podle me se to unlockne, ale pokud pak znova vytocim s ttyACM1 tak je to v koncich... Musim resetovat pocitac modem se tak hodi na ttyACM0 a muzu znova vytocit..

btw myslis ze bys to moh postnout az budes u toho sveho stroja?

jinak dik za napad..

[Pepa]

jo a jinak pro doplneni.. pokud se modem resetuje a neni zrovna aktivni spojeni, pak se zatizeni hodi znovu na ttyACM0 a jde pak zas v pohode vytocit...

[Pepa]

Vi teda prosim ekdo jak na to? docela o specha...

[wake]

takze v gentoo je to takhle (pro muj mobylni modem):
do souboru /etc/udev/rules.d/10-local.rules date radek BUS="usb" SYSFS{idProduct}="XXXX" SYSFS{idVendor}="YYYY" name="%k" SYMLINK="moudem", kde XXXX a YYYY jsou prislusne identifikatory z /sys/....... Potom pppd nakonfigurujete tak, aby jako device pouzival /dev/modem.

enjoy ;)