g_mass_storage: module ready, but no device found

I try to setup g_mass_Storage to serve mass_storage device on my nanopi neo air with friendlycore (lichee) 3.4 onboard. Module successfully loaded and report, that it has reached ready state, but no device found on pc.
My configuration (in /etc/modprobe.d):

options g_mass_storage file=/mass_storage stall=0  iSerialNumber="Item_1" iProduct="Some_product"  iManufacturer="I"

/mass_storage is image which i get by dd 2gb from /dev/zero and then partioning with fdisk.

There is dmesg out:

usb close backing file: 0xd4893000
[ 2801.326443] usb open backing file: /mass_storage, 0xd4893800
[ 2801.326814] g_mass_storage gadget: Mass Storage Function, version: 2009/09/11
[ 2801.326846] g_mass_storage gadget: Number of LUNs=1
[ 2801.326885]  lun0: LUN: removable file: /mass_storage
[ 2801.326945] ep_matches, wrn: endpoint already claimed, ep(0xc09e5924, 0xbf145818, ep1in-bulk)
[ 2801.326981] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
[ 2801.327027] g_mass_storage gadget: g_mass_storage ready

I’m carring about “endpoint already claimed” message – what does it mean? Can this fact – already claimed endpoint – lead to unrecognizing device on pc? How i can repair it? Or what else can be whong with my g_mass_storage configuration?

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Author: Ksnadr Renderon