Hi Tony,
W dniu 15.01.2016 o 23:48, Tony Lindgren pisze:
Hi all,
Looks like there's some issue with the USB gadgets and configfs.
I'm seeing rmmod of the UDC driver cause a warning and then reboot
hangs the system. This happens at least with v4.4, and I've reproduced
it with dwc3 and musb so it seems to be generic.
I can't reproduce your problem on 4.4-rc4 nor on 4.4 release
with the script you provided
I'm using Odroid XU3, which has dwc3.
I think Felipe is offline for next few days, but anyways here are
the error messages and a shells script to reproduce the issue.
Cheers,
Tony
<snip>
Test script to reproduce the problem, need to uncomment the reboot part:
8< --------------------
#!/bin/bash
# Change for your UDC controller
udc_module=dwc3-omap
udc_name=4a030000.dwc3
for me these are:
udc_module=dwc3-exynos
udc_name=12400000.dwc3
#
# Calling this and then doing rmmod $udc_module
# followed by reboot seems to produce the follow:
# WARNING: CPU: 1 PID: 1617 at lib/debugobjects.c:263
#
start_usb_gadgets() {
vendor=0x1d6b
product=0x0106
file=$1
mount -t configfs none /sys/kernel/config
mkdir /sys/kernel/config/usb_gadget/g1
old_pwd=$(pwd)
cd /sys/kernel/config/usb_gadget/g1
echo $product > idProduct
echo $vendor > idVendor
mkdir strings/0x409
echo 123456789 > strings/0x409/serialnumber
echo foo > strings/0x409/manufacturer
echo "Multi Gadget" > strings/0x409/product
mkdir configs/c.1
echo 120 > configs/c.1/MaxPower
mkdir configs/c.1/strings/0x409
echo "Conf 1" > configs/c.1/strings/0x409/configuration
mkdir configs/c.2
echo 500 > configs/c.2/MaxPower
mkdir configs/c.2/strings/0x409
echo "Conf 2" > configs/c.2/strings/0x409/configuration
mkdir functions/mass_storage.0
echo $file > functions/mass_storage.0/lun.0/file
ln -s functions/mass_storage.0 configs/c.1
ln -s functions/mass_storage.0 configs/c.2
# Not configuring further here just produces
# WARNING: CPU: 1 PID: 1609 at lib/debugobjects.c:263
mkdir functions/acm.0
ln -s functions/acm.0 configs/c.1
ln -s functions/acm.0 configs/c.2
mkdir functions/ecm.0
ln -s functions/acm.0 configs/c.1
I assume you meant ecm.0 here and in the next line.
ln -s functions/acm.0 configs/c.2
# Adding rndis seems to cause alignment trap or some
# random oops on reboot after rmmod $udc_module
mkdir functions/rndis.0
ln -s functions/rndis.0 configs/c.1
ln -s functions/rndis.0 configs/c.2
echo $udc_name > /sys/kernel/config/usb_gadget/g1/UDC
cd $old_pwd
}
function rmmod_and_shutdown() {
rmmod $udc_module
reboot
}
modprobe $udc_module
start_usb_gadgets ""
# uncomment this to reproduce bug
# rmmod_and_shutdown
I have it uncommented, no problems.
But before I run this script I need to modprobe libcomposite,
though.
AP
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