USB modem sa odpaja

Mam problem, ze USB modem (telefon Nokia) sa hocikedy odpoji (zmizne /dev/ttyACM0) a je nutne vybrat USB kabel z portu a znova ho zapojit. Ide o starsi server. Predtym som mal tento modem na virtualnom serveri (Vmware), kde boli tiez obcas problemy, ale teraz na fyzickom serveri sa modem odpaja prilis casto. Server uz bohuzial nema podporu, takze nemozem upgradnut BIOS.

# uname -a
Linux server 3.10.0-327.13.1.el7.x86_64 #1 SMP Thu Mar 31 16:04:38 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Pri odpojenom modeme (vsimnite si treti stlpec Used by, kde je 0 pri cdc_acm):

#lsmod | grep cdc
cdc_acm                32971  0 
cdc_ether              14351  1 rndis_host
usbnet                 43956  2 rndis_host,cdc_ether

#lsusb
Bus 001 Device 007: ID 0421:0592 Nokia Mobile Phones 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

#dmesg
[828974.192374] usb 1-1: USB disconnect, device number 4
[829017.363051] usb 1-1: new high-speed USB device number 5 using ehci-pci
[829017.491554] usb 1-1: device descriptor read/all, error -71
[829018.226049] usb 1-1: new high-speed USB device number 7 using ehci-pci
[829018.346610] usb 1-1: New USB device found, idVendor=0421, idProduct=0592
[829018.346617] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[829018.346621] usb 1-1: Product: C5-00.2
[829018.346626] usb 1-1: Manufacturer: Nokia
[829018.346630] usb 1-1: SerialNumber: 353275055527007
[829018.349141] cdc_acm 1-1:1.1: ttyACM1: USB ACM device -- vytvoril nove zariadenie ttyACM1???
[829018.350531] usb 1-1: bad CDC descriptors

Po odpojeni a zapojeni kabla do toho isteho USB portu:

#dmesg
[908099.144985] usb 1-1: USB disconnect, device number 7
[908102.351054] usb 1-1: new high-speed USB device number 8 using ehci-pci
[908102.468103] usb 1-1: New USB device found, idVendor=0421, idProduct=0592
[908102.468110] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[908102.468115] usb 1-1: Product: C5-00.2
[908102.468119] usb 1-1: Manufacturer: Nokia
[908102.468124] usb 1-1: SerialNumber: 353275055527007
[908102.470500] cdc_acm 1-1:1.1: ttyACM0: USB ACM device
[908102.471275] usb 1-1: bad CDC descriptors

Vsimnite si treti stlpec Used by, kde je tentoraz 2 pri cdc_acm

#lsmod | grep cdc
cdc_acm                32971  2 
cdc_ether              14351  1 rndis_host

usbnet 43956 2 rndis_host,cdc_ether

Ahoj,

podobne chovanie mam s UPS, ktora je pripojena cez usb-serial prevodnik.

Ako workaround mam taketo usb resetovatko v crone.


# Bus 00X Device 00Y: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
DEV=`lsusb| grep '067b:2303' |awk {'print "/dev/bus/usb/"$2"/"$4'}|cut -f1 -d:`
echo "Reseting usb device $DEV"
usbreset $DEV

Samotny usb reset vyzera takto


#include <stdio.h>

#include <fcntl.h>

#include <errno.h>

#include <sys/ioctl.h>

#include <linux/usbdevice_fs.h>

void main(int argc, char **argv)

{

        const char *filename;

        int fd;

        filename = argv[1];

        fd = open(filename, O_WRONLY);

        ioctl(fd, USBDEVFS_RESET, 0);

        close(fd);

        return;

}

Dotaz: USB modem sa odpaja

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