Date:	Sat, 19 Jan 2013 09:48:01 +0100
From:	Arkadiusz Miskiewicz <a.miskiewicz@...il.com>
To:	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Johan Hovold <jhovold@...il.com>,
	Peter Korsgaard <jacmet@...site.dk>,
	Alan Cox <alan@...ux.intel.com>,
	Preston Fick <preston.fick@...abs.com>
Subject: Re: 3.7.3, ttyUSB0 serial problem - devices stop working and only reboot helps (Inappropriate ioctl for device)

On Saturday 19 of January 2013, Arkadiusz Miskiewicz wrote:
> On Saturday 19 of January 2013, Greg Kroah-Hartman wrote:
> > On Fri, Jan 18, 2013 at 11:28:43PM +0100, Arkadiusz Miskiewicz wrote:
> > > Hi.
> > > 
> > > Using 3.7.3 kernel and connecting two rs232 usb adapters, CP2102 and
> > > FT232RL, one after disconnecting another.
> > > 
> > > After few cycles of reconnecting and using socat (below) I'm getting
> > > problems accessing ttyUSB0:
> > > ioctl(3, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or
> > > TCGETS, 0x7fffb70c6ae0) = -1 ENOTTY (Inappropriate ioctl for device)
> > > 
> > > Unloading and reloading (by udev) modules ftdio_sio, cp210x, usbserial
> > > doesn't help. I have to reboot to get ttyUSB0 working (regardless of
> > > which driver, ftdio_sio or cp210x is handling ttyUSB0 - both stop
> > > working).
> > > 
> > > Any clues?
> > 
> > The kernel log shows the device getting removed a bunch and then coming
> > back, which implies electrical issues (flaky connection, low power,
> > etc.)  Are you really removing it and plugging it back in?  Or is it
> > doing it all by itself?
> 
> I was doing plug in CP2102, remove it, plug in FT232RL after few seconds,
> remove it, plug in CP... (and various variations, several times) and
> testing with socat before removing devices. After some iteration the
> problem appears and only reboot helps.

The issue is really weird. Machine is Thinkpad T400 2764CTO (latest bios). 
When the problem happened on 3.7.3 today I rebooted into 3.8rc4 and ... 
freshly after reboot and plugging in PL2303 adapter the problem was already 
there. Didn't have to do unplug/plug cycle to make it happen.

Looks like sometimes reboot cures the problem, sometimes it doesn't. Now 
powered off laptop and powered it on - problem gone.

Connected PL2303, ran socat, disconnected PL2303 (while socat was running) -> 
problem happened again. Looks like it doesn't depend on adapter chip type.

So to reproduce here:
- boot fresh 3.8rc4
- plug in some adapter (PL2303 for example)
- run "socat -ddd -s -u /dev/ttyUSB0,raw,echo=0,b115200,crnl,noctty,nonblock - 
| logger" - it should run fine, without any error
- disconnect adapter; socat should exit with error "W cannot restore terminal 
settings on fd 3: Input/output error"
- plug in adapter again
- run socat again -> this time error "E tcgetattr(3, 0x7fff21411780): 
Inappropriate ioctl for device" immediately always; regardless which adapter 
is used and if kernel module drivers for these adapters were reloaded

dmesg:
http://pastebin.com/r1Q5mmgt

config:
http://pastebin.com/8dpFFzuU

lspci:
http://pastebin.com/TBtUg1tW

lsusb:
http://pastebin.com/SueVw9CD

[   53.776047] usb 4-1: new full-speed USB device number 2 using uhci_hcd
[   53.938053] usb 4-1: New USB device found, idVendor=067b, idProduct=2303
[   53.938060] usb 4-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=0
[   53.938065] usb 4-1: Product: USB-Serial Controller
[   53.938068] usb 4-1: Manufacturer: Prolific Technology Inc.
[   53.949924] usbcore: registered new interface driver usbserial
[   53.950364] usbcore: registered new interface driver usbserial_generic
[   53.951147] usbserial: USB Serial support registered for generic
[   53.954268] usbcore: registered new interface driver pl2303
[   53.955009] usbserial: USB Serial support registered for pl2303
[   53.955039] pl2303 4-1:1.0: pl2303 converter detected
[   53.967394] usb 4-1: pl2303 converter now attached to ttyUSB0
[   64.492122] usb 4-1: USB disconnect, device number 2
[   64.501748] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
[   64.502343] pl2303 4-1:1.0: device disconnected
[   66.494930] usb 4-1: new full-speed USB device number 3 using uhci_hcd
[   66.654247] usb 4-1: New USB device found, idVendor=067b, idProduct=2303
[   66.654261] usb 4-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=0
[   66.654269] usb 4-1: Product: USB-Serial Controller
[   66.654276] usb 4-1: Manufacturer: Prolific Technology Inc.
[   66.659661] pl2303 4-1:1.0: pl2303 converter detected
[   66.671587] usb 4-1: pl2303 converter now attached to ttyUSB0

5722  munmap(0x7f1bfc0d7000, 4096)      = 0
5722  write(2, "2013/01/19 09:36:38 socat[5722] E tcgetattr(3, 
0x7fffeff64020): Inappropriate ioctl for device\n", 95) = 95
5722  ioctl(3, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 
0x7fffeff63e50) = -1 ENOTTY (Inappropriate ioctl for device)
5722  write(2, "2013/01/19 09:36:38 socat[5722] E tcgetattr(3, 
0x7fffeff63f90): Inappropriate ioctl for device\n", 95) = 95
5722  ioctl(3, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 
0x7fffeff63ec0) = -1 ENOTTY (Inappropriate ioctl for device)
5722  write(2, "2013/01/19 09:36:38 socat[5722] E tcgetattr(3, 
0x7fffeff64160): Inappropriate ioctl for device\n", 95) = 95
5722  fcntl(3, F_SETFD, FD_CLOEXEC)     = 0
5722  ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 
0x7fffeff64330) = -1 ENOTTY (Inappropriate ioctl for device)
5722  select(4, [3], [1], [], NULL)     = 2 (in [3], out [1])

-- 
Arkadiusz Miśkiewicz, arekm / maven.pl
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