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Date:	Tue, 30 Dec 2014 22:11:37 +0100
From:	"Stefan Lippers-Hollmann" <s.L-H@....de>
To:	jarod@...sonet.com
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	m.chehab@...sung.com, James Hogan <james.hogan@...tec.com>,
	"David Härdeman" <david@...deman.nu>,
	"Antti Seppälä" <a.seppala@...il.com>,
	Tomas Melin <tomas.melin@....fi>
Subject: Re: mceusb: sysfs: cannot create duplicate filename '/class/rc/rc0' (race condition between multiple RC_CORE devices)

Hi

Adding the maintainers for drivers/media/rc/rc-main.c into the loop.

This is a follow-up for:
	http://lkml.kernel.org/r/<201412181916.18051.s.L-H@....de>

On Thursday 18 December 2014, Stefan Lippers-Hollmann wrote:
> Occassionally, but not readily reproducably, I hit a race condition 
> between mceusb and other connected RC_CORE devices when mceusb tries 
> to create /class/rc/rc0, which is -by then- already taken by another 
> RC_CORE device. The other involved IR devices (physically only one)
> are part of a PCIe TeVii s480 s2.1 twin-tuner DVB-S2 card and aren't 
> actually supposed to receive IR signals (IR receiver not connected):
> 
> mceusb device transceiver:
> Bus 002 Device 004: ID 0609:0334 SMK Manufacturing, Inc. eHome Infrared Receiver
> 
> DVB-T receiver (no RC_CORE device)
> Bus 001 Device 004: ID 0ccd:0069 TerraTec Electronic GmbH Cinergy T XE (Version 2, AF9015)
> 
> twin-tuner DVB-S2 PCIe device, TeVii s480 v2.1 (physically one IR 
> receiver (NEC protocol), logically recognized as two RC_CORE devices):
[...]
> 	Bus 006 Device 003: ID 9022:d660 TeVii Technology Ltd. DVB-S2 S660
> 	Bus 003 Device 003: ID 9022:d660 TeVii Technology Ltd. DVB-S2 S660

Today I got a new, similar, trace with kernel 3.18.1, but this is not a
regression and randomly happens with older kernels as well. The 
frequency of this occuring differs vastly, this time it was 12 days 
with probably 20 (re-)boots, before that it didn't happen for multiple
weeks. I can not totally rule out if it ever happened in the reverse
detection/ initialisation order, as I wouldn't notice the consequences 
of dvb_usb_dw2102's RC_CORE devices failing to initialise, but I think
the problem might be seated in the common core of rc-main.c.

usb 1-1.5: New USB device found, idVendor=0ccd, idProduct=0069
usb 1-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.5: Product: Cinergy T USB XE Ver.2
usb 1-1.5: Manufacturer: TerraTec
usb 1-1.5: SerialNumber: 10012007
[...]
dvb-usb: found a 'TeVii S480.1 USB' in cold state, will try to load a firmware
dvb-usb: downloading firmware from file 'dvb-usb-s660.fw'
dw2102: start downloading DW210X firmware
usb 1-1.5: dvb_usb_v2: found a 'TerraTec Cinergy T USB XE' in cold state
usb 1-1.5: dvb_usb_v2: downloading firmware from file 'dvb-usb-af9015.fw'
[...]
usb 2-1.6: New USB device found, idVendor=0609, idProduct=0334
usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-1.6: Product: MCE TRANCEIVR Emulator Device 2006
usb 2-1.6: Manufacturer: SMK CORPORATION
usb 2-1.6: SerialNumber: PA070620045513C
[...]
usb 3-1: USB disconnect, device number 2
usb 2-1.8: new full-speed USB device number 5 using ehci-pci
usb 1-1.5: dvb_usb_v2: found a 'TerraTec Cinergy T USB XE' in warm state
[...]
dvb-usb: found a 'TeVii S480.1 USB' in warm state.
dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
DVB: registering new adapter (TeVii S480.1 USB)
dvb-usb: MAC address: 70:70:70:70:70:70
Invalid probe, probably not a DS3000
dvb-usb: no frontend was attached by 'TeVii S480.1 USB'
[...]
Registered IR keymap rc-tevii-nec
input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.5/0000:04:00.1/usb3/3-1/rc/rc0/input18
rc0: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.5/0000:04:00.1/usb3/3-1/rc/rc0
dvb-usb: schedule remote query interval to 150 msecs.
dvb-usb: TeVii S480.1 USB successfully initialized and connected.
dvb-usb: found a 'TeVii S480.2 USB' in cold state, will try to load a firmware
dvb-usb: downloading firmware from file 'dvb-usb-s660.fw'
dw2102: start downloading DW210X firmware
[...]
Registered IR keymap rc-rc6-mce
------------[ cut here ]------------
WARNING: CPU: 1 PID: 311 at /tmp/buildd/linux-aptosid-3.18/fs/sysfs/dir.c:31 sysfs_warn_dup+0x55/0x70()
sysfs: cannot create duplicate filename '/class/rc/rc0'
Modules linked in: rt2800usb(+) rt2x00usb rt2800lib rt2x00lib mac80211 cfg80211 crc_ccitt rc_rc6_mce mceusb(+) rc_tevii_nec ds3000 nls_utf8 nls_cp437 vfat fat iTCO_wdt iTCO_vendor_support eeepc_wmi asus_wmi intel_rapl sparse_keymap rfkill x86_pkg_temp_thermal evdev intel_powerclamp coretemp kvm_intel kvm snd_hda_codec_hdmi crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_codec_realtek snd_hda_codec_generic aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper dvb_usb_af9015(+) cryptd dvb_usb_v2 dvb_usb_dw2102(+) dvb_usb dvb_core rc_core psmouse snd_hda_intel pcspkr snd_hda_controller serio_raw i2c_i801 snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore lpc_ich mfd_core battery tpm_infineon i915 video i2c_algo_bit drm_kms_helper drm i2c_core intel_gtt ie31200_edac mei_me
 edac_core mei wmi button processor nct6775 hwmon_vid fuse parport_pc ppdev lp parport autofs4 ext4 crc16 jbd2 mbcache dm_mod sg sd_mod ohci_pci crc32c_intel ahci libahci libata scsi_mod xhci_pci ohci_hcd ehci_pci xhci_hcd ehci_hcd r8169 mii usbcore usb_common fan thermal
CPU: 1 PID: 311 Comm: systemd-udevd Not tainted 3.18.0-1.slh.1-aptosid-amd64 #1 aptosid 3.18-5
Hardware name: System manufacturer System Product Name/P8H77-M PRO, BIOS 1503 03/17/2014
 0000000000000009 00000000cedd943b 0000000000000009 ffffffff814ddd08
 ffff8807f06db8a0 ffffffff8105f3fd ffff8807f2091000 ffff8807f00bfa40
 ffff8807f20128e8 ffff8807f20128e8 ffffffffffffffef ffffffff8105f478
Call Trace:
 [<ffffffff814ddd08>] ? dump_stack+0x49/0x6a
 [<ffffffff8105f3fd>] ? warn_slowpath_common+0x6d/0x90
 [<ffffffff8105f478>] ? warn_slowpath_fmt+0x58/0x80
 [<ffffffff811e8042>] ? kernfs_path+0x42/0x50
 [<ffffffff811eb3d5>] ? sysfs_warn_dup+0x55/0x70
 [<ffffffff811eb72e>] ? sysfs_do_create_link_sd.isra.2+0xbe/0xd0
 [<ffffffff81362f24>] ? device_add+0x3b4/0x660
 [<ffffffffa01328ec>] ? rc_register_device+0x1bc/0x600 [rc_core]
 [<ffffffffa0d5bf55>] ? mceusb_dev_probe+0x405/0xadd [mceusb]
 [<ffffffff8126eaf8>] ? ida_get_new_above+0x1f8/0x220
 [<ffffffffa005c69b>] ? usb_probe_interface+0x1ab/0x2d0 [usbcore]
 [<ffffffff81365c87>] ? driver_probe_device+0x87/0x260
 [<ffffffff81365f2b>] ? __driver_attach+0x7b/0x80
 [<ffffffff81365eb0>] ? __device_attach+0x50/0x50
 [<ffffffff81363d4b>] ? bus_for_each_dev+0x6b/0xc0
 [<ffffffff81365428>] ? bus_add_driver+0x178/0x230
 [<ffffffff8136655e>] ? driver_register+0x5e/0xf0
 [<ffffffffa005b04b>] ? usb_register_driver+0x7b/0x160 [usbcore]
 [<ffffffffa0d5f000>] ? 0xffffffffa0d5f000
 [<ffffffffa0d5f000>] ? 0xffffffffa0d5f000
 [<ffffffff81002108>] ? do_one_initcall+0x98/0x200
 [<ffffffff810cf144>] ? load_module+0x1ce4/0x22b0
 [<ffffffff810cc330>] ? __symbol_put+0xa0/0xa0
 [<ffffffff811804de>] ? kernel_read+0x4e/0x80
 [<ffffffff810cf87d>] ? SyS_finit_module+0x8d/0xa0
 [<ffffffff814e3d29>] ? system_call_fastpath+0x12/0x17
---[ end trace 1b9fabfd70d94467 ]---
mceusb 2-1.6:1.0: remote dev registration failed
mceusb 2-1.6:1.0: mceusb_dev_probe: device setup failed!
mceusb: probe of 2-1.6:1.0 failed with error -12
usbcore: registered new interface driver mceusb
dvb-usb: TeVii S480.1 USB successfully deinitialized and disconnected.
usb 6-1: USB disconnect, device number 2
usb 2-1.5: reset high-speed USB device number 3 using ehci-pci
dvb-usb: found a 'TeVii S480.2 USB' in warm state.
dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
DVB: registering new adapter (TeVii S480.2 USB)
dvb-usb: MAC address: 28:28:28:28:28:28
Invalid probe, probably not a DS3000
dvb-usb: no frontend was attached by 'TeVii S480.2 USB'
Registered IR keymap rc-tevii-nec
input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.5/0000:04:00.3/usb6/6-1/rc/rc0/input20
rc0: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.5/0000:04:00.3/usb6/6-1/rc/rc0
dvb-usb: schedule remote query interval to 150 msecs.
dvb-usb: TeVii S480.2 USB successfully initialized and connected.
usbcore: registered new interface driver dw2102
dvb-usb: TeVii S480.2 USB successfully deinitialized and disconnected.
[...]
usb 1-1.5: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
DVB: registering new adapter (TerraTec Cinergy T USB XE)
i2c i2c-9: af9013: firmware version 5.1.0.0
usb 1-1.5: DVB: registering adapter 0 frontend 0 (Afatech AF9013)...
mc44s803: successfully identified (ID = 14)
usb 1-1.5: dvb_usb_v2: 'TerraTec Cinergy T USB XE' successfully initialized and connected
usbcore: registered new interface driver dvb_usb_af9015
[...]
usb 3-1: new high-speed USB device number 3 using ehci-pci
usb 3-1: config 1 interface 0 altsetting 0 bulk endpoint 0x81 has invalid maxpacket 2
usb 3-1: New USB device found, idVendor=9022, idProduct=d660
usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-1: Product: DVBS2BOX
usb 3-1: Manufacturer: TBS-Tech
dvb-usb: found a 'TeVii S660 USB' in cold state, will try to load a firmware
dvb-usb: downloading firmware from file 'dvb-usb-s660.fw'
dw2102: start downloading DW210X firmware
usb 6-1: new high-speed USB device number 3 using ehci-pci
[...]
dvb-usb: found a 'TeVii S660 USB' in warm state.
dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
DVB: registering new adapter (TeVii S660 USB)
usb 6-1: config 1 interface 0 altsetting 0 bulk endpoint 0x81 has invalid maxpacket 2
usb 6-1: New USB device found, idVendor=9022, idProduct=d660
usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 6-1: Product: DVBS2BOX
usb 6-1: Manufacturer: TBS-Tech
dvb-usb: found a 'TeVii S660 USB' in cold state, will try to load a firmware
dvb-usb: downloading firmware from file 'dvb-usb-s660.fw'
dw2102: start downloading DW210X firmware
dvb-usb: found a 'TeVii S660 USB' in warm state.
dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
DVB: registering new adapter (TeVii S660 USB)
dvb-usb: MAC address: 00:18:bd:5a:be:8b
DS3000 chip version: 0.192 attached.
ts2020_attach: Find tuner TS2020!
dw2102: Attached ds3000+ts2020!

usb 3-1: DVB: registering adapter 1 frontend 0 (Montage Technology DS3000)...
Registered IR keymap rc-tevii-nec
input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.5/0000:04:00.1/usb3/3-1/rc/rc0/input25
rc0: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.5/0000:04:00.1/usb3/3-1/rc/rc0
dvb-usb: schedule remote query interval to 150 msecs.
dvb-usb: TeVii S660 USB successfully initialized and connected.
dvb-usb: MAC address: 00:18:bd:5a:be:8c
DS3000 chip version: 0.192 attached.
ts2020_attach: Find tuner TS2020!
dw2102: Attached ds3000+ts2020!

usb 6-1: DVB: registering adapter 2 frontend 0 (Montage Technology DS3000)...
Registered IR keymap rc-tevii-nec
input: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.5/0000:04:00.3/usb6/6-1/rc/rc1/input26
rc1: IR-receiver inside an USB DVB receiver as /devices/pci0000:00/0000:00:1c.5/0000:04:00.3/usb6/6-1/rc/rc1
dvb-usb: schedule remote query interval to 150 msecs.
dvb-usb: TeVii S660 USB successfully initialized and connected.
[...]
ds3000_firmware_ondemand: Waiting for firmware upload (dvb-fe-ds3000.fw)...
ds3000_firmware_ondemand: Waiting for firmware upload(2)...
ds3000_firmware_ondemand: Waiting for firmware upload (dvb-fe-ds3000.fw)...
ds3000_firmware_ondemand: Waiting for firmware upload(2)...
[...]

This can be recovered by reloading mceusb
	# modprobe -r mceusb
	# modprobe mceusb

[...]
usbcore: deregistering interface driver mceusb
Registered IR keymap rc-rc6-mce
input: Media Center Ed. eHome Infrared Remote Transceiver (0609:0334) as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6/2-1.6:1.0/rc/rc2/input27
rc2: Media Center Ed. eHome Infrared Remote Transceiver (0609:0334) as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6/2-1.6:1.0/rc/rc2
IR Sony protocol handler initialized
IR JVC protocol handler initialized
IR RC5(x/sz) protocol handler initialized
IR RC6 protocol handler initialized
input: MCE IR Keyboard/Mouse (mceusb) as /devices/virtual/input/input28
IR MCE Keyboard/mouse protocol handler initialized
IR NEC protocol handler initialized
IR Sharp protocol handler initialized
IR XMP protocol handler initialized
IR SANYO protocol handler initialized
lirc_dev: IR Remote Control driver registered, major 249 
rc rc2: lirc_dev: driver ir-lirc-codec (mceusb) registered at minor = 0
IR LIRC bridge handler initialized
mceusb 2-1.6:1.0: Registered SMK CORPORATION MCE TRANCEIVR Emulator Device 2006 with mce emulator interface version 1
mceusb 2-1.6:1.0: 2 tx ports (0x0 cabled) and 2 rx sensors (0x1 active)
usbcore: registered new interface driver mceusb
[...]

Regards
	Stefan Lippers-Hollmann
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