El día Monday, June 16, 2014 a las 12:10:41PM +0200, Hans Petter Selasky 
escribió:

> What happens if you revert that patch, and do a read first, instead of a 
> write?

I have revert both patches, i.e. the code is now as it was, but has some
DPRINTF statements at the beginning of the fuctions; here is what
happens on plug-in, read and write to the device:

plug-in USB cable:

Jun 16 14:28:33 La-Habana root: Unknown USB device: vendor 0x0c45 product 
0x62c0 bus uhub3
Jun 16 14:28:33 La-Habana root: Unknown USB device: vendor 0x0c45 product 
0x62c0 bus uhub3
Jun 16 14:29:18 La-Habana kernel: ugen1.2: <Prlific Technology Inc.> at usbus1
Jun 16 14:29:18 La-Habana kernel: ulpt_probe: 
Jun 16 14:29:18 La-Habana kernel: ulpt_probe: 
Jun 16 14:29:18 La-Habana kernel: ulpt_attach: sc=0xc6c48900
Jun 16 14:29:18 La-Habana kernel: ulpt0: <Prlific Technology Inc. IEEE-1284 
Controller, class 0/0, rev 1.00/2.00, addr 2> on usbus1
Jun 16 14:29:18 La-Habana kernel: ulpt_attach: setting alternate config number: 
1
Jun 16 14:29:18 La-Habana kernel: ulpt0: using bi-directional mode
Jun 16 14:29:18 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:19 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:19 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:20 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:20 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:21 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:22 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:22 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:23 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:24 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:24 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:25 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:26 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:26 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:27 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:28 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:28 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:29 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:29 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:30 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:30 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:31 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:31 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:32 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:32 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:33 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:33 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:34 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:34 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT

issued command 'cat < /dev/unlpt0'

Jun 16 14:29:35 La-Habana kernel: unlpt_open: debugging ulpt.c: unlpt_open()
Jun 16 14:29:35 La-Habana kernel: ulpt_start_read: debugging ulpt.c: 
ulpt_start_read()
Jun 16 14:29:35 La-Habana kernel: ulpt_read_callback: state=0x0
Jun 16 14:29:35 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:36 La-Habana kernel: ulpt0: at uhub1, port 1, addr 2 (disconnected)
Jun 16 14:29:36 La-Habana kernel: ulpt_detach: sc=0xc6c48900
Jun 16 14:29:36 La-Habana kernel: ulpt_stop_read: debugging ulpt.c: 
ulpt_stop_read()
Jun 16 14:29:36 La-Habana kernel: ulpt_read_callback: state=0x2
Jun 16 14:29:38 La-Habana kernel: ulpt_probe: 
Jun 16 14:29:38 La-Habana kernel: ulpt_probe: 
Jun 16 14:29:38 La-Habana kernel: ulpt_attach: sc=0xc6c48680
Jun 16 14:29:38 La-Habana kernel: ulpt0: <Prlific Technology Inc. IEEE-1284 
Controller, class 0/0, rev 1.00/2.00, addr 2> on usbus1
Jun 16 14:29:38 La-Habana kernel: ulpt_attach: setting alternate config number: 
1
Jun 16 14:29:38 La-Habana kernel: ulpt0: using bi-directional mode
Jun 16 14:29:38 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()


switching to 'date > /dev/unlpt0'

Jun 16 14:29:39 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:39 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:40 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:40 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:41 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:41 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:42 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:42 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:43 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:43 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:44 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:44 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:45 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:46 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:46 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:47 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:29:48 La-Habana kernel: unlpt_open: debugging ulpt.c: unlpt_open()
Jun 16 14:29:48 La-Habana kernel: ulpt_start_write: debugging ulpt.c: 
ulpt_start_write()
Jun 16 14:29:48 La-Habana kernel: ulpt_write_callback: state=0x0 actlen=0
Jun 16 14:29:48 La-Habana kernel: ulpt_start_write: debugging ulpt.c: 
ulpt_start_write()
Jun 16 14:29:48 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:29:48 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:14 La-Habana last message repeated 26 times
Jun 16 14:30:15 La-Habana kernel: ulpt_stop_write: debugging ulpt.c: 
ulpt_stop_write()
Jun 16 14:30:15 La-Habana kernel: ulpt0: at uhub1, port 1, addr 2 (disconnected)
Jun 16 14:30:15 La-Habana kernel: ulpt_detach: sc=0xc6c48680
Jun 16 14:30:15 La-Habana kernel: ulpt_write_callback: state=0x2 actlen=0
Jun 16 14:30:16 La-Habana kernel: ulpt_probe: 
Jun 16 14:30:16 La-Habana kernel: ulpt_probe: 
Jun 16 14:30:16 La-Habana kernel: ulpt_attach: sc=0xc5529600
Jun 16 14:30:16 La-Habana kernel: ulpt0: <Prlific Technology Inc. IEEE-1284 
Controller, class 0/0, rev 1.00/2.00, addr 2> on usbus1
Jun 16 14:30:16 La-Habana kernel: ulpt_attach: setting alternate config number: 
1
Jun 16 14:30:16 La-Habana kernel: ulpt0: using bi-directional mode
Jun 16 14:30:16 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:16 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:16 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:18 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:18 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:19 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:19 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:20 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:20 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:21 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:21 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:22 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:23 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:23 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:24 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:24 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:25 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:25 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:26 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:27 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:27 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:28 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:28 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()
Jun 16 14:30:29 La-Habana kernel: ulpt_status_callback: error=USB_ERR_TIMEOUT
Jun 16 14:30:29 La-Habana kernel: ulpt_watchdog: debugging ulpt.c: 
ulpt_watchdog()

Thx

        matthias
-- 
Matthias Apitz               |  /"\   ASCII Ribbon Campaign:
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