[FS#4135] ATH79 - AR9331 gadget mode bug

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Sergey (SergDatex) 

Attached to Project - OpenWrt/LEDE Project
Summary - ATH79 - AR9331 gadget mode bug
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - At this week i have installed the last version of OpenWRT (21.02.1) at my modded TP-Link MR3020 v1 (8MB SPI Flash, 64MB DDR SDRAM).
I switched USB port to 'device' mode with hardware mod (GPIO13) and turn on kmod modules for gadget mode with 'make menuconfig'. also I slightly corrected the config file 'ar9331_tplink_mr-3020_v1.dts for usb controller mode: 'host'-> 'peripheral'.

Firmware starts normally.
When i prompt command 'insmod g_mass_storage file=/image', host detects the new mass storage device with correct attributes (name, serial, sectors count).

For prevent buffer overload bugs, i check this module with very small image file (64KB).

Log for that stage:
root at OpenWrt:/# insmod g_mass_storage file=backing_file
[  348.897602] Mass Storage Function, version: 2009/09/11
[  348.901303] LUN: removable file: (no medium)
[  348.905837] LUN: file: /backing_file
[  348.909104] Number of LUNs=1
[  348.923787] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
[  348.929305] g_mass_storage gadget: userspace failed to provide iSerialNumber
[  348.936379] g_mass_storage gadget: g_mass_storage ready
root at OpenWrt:/# [  349.412682] g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage

 
But if i try to read sectors from that device - it is not succesfull. My host pc freezes for some seconds, and after pause device disconnected from host.
At this moment i see a restart of the OpenWRT with watchdog:

root at OpenWrt:/# [  349.412682] g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage


***************************************
*     U-Boot 1.1.4-e5984195-clean     *
*          Build: 2017-02-24          *
***************************************
......
[    3.927282] init: Console is alive
[    3.930007] init: - watchdog -
[    3.932844] init: Watchdog has previously reset the system
.......
[   15.135549] procd: - early -
[   15.137533] procd: - watchdog -
[   15.140670] procd: Watchdog has previously reset the system
[   16.233851] procd: - watchdog -
[   16.236135] procd: Watchdog has previously reset the system
[   16.244006] procd: - ubus -
[   17.216758] urandom_read: 3 callbacks suppressed


i compiled the previous version (19.07.8 - Atheros AR7xxx/AR9xx -> Devices with small flash -> MR3020v1) - gadget mode (g_mass_storage) works fine at that board.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4135

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