> From: Alan Stern <stern@rowland.harvard.edu>
> Subject: Re: USB Serial device disconnect causes IRQ disable details captured
> To: "amruth" <amruth_pv@yahoo.com>
> Cc: "Oliver Neukum" <oliver@neukum.org>,
linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org
> Date: Thursday, August 21, 2008, 4:20 PM
> On Thu, 21 Aug 2008, amruth wrote:
>
> > Hi
> > Oliver
> > I got the same issue once again. I have captured
> detail log and lusb -t with interrupts.
> > cat /proc/interrupts:
>
> > dmesg:
> > sb 1-5: Magtek 75/Excella USB card reader converter
> now attached to ttyUSB1
> > drivers/usb/core/inode.c: creating file '012'
> > usb 1-5: New USB device found, idVendor=0801,
> idProduct=2231
> > usb 1-5: New USB device strings: Mfr=1, Product=2,
> SerialNumber=3
> > usb 1-5: Product: STX
> > usb 1-5: Manufacturer: MagTek
> > usb 1-5: SerialNumber: STX001
> > usb 2-2: uhci_result_common: failed with status 440000
> > /home/amr/linux-2.6.26/drivers/usb/serial/magtek.c:
> magtek_read_int_callback - p
> > ort 0
> > uhci_hcd 0000:00:1d.0: release dev 6 ep81-INT, period
> 8, phase 4, 61 us
> > hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0004
> > uhci_hcd 0000:00:1d.0: port 2 portsc 008a,00
> > hub 2-0:1.0: port 2, status 0100, change 0003, 12 Mb/s
> > usb 2-2: USB disconnect, address 6
> > usb 2-2: unregistering device
> > usb 2-2: usb_disable_device nuking all URBs
> > usb 2-2: unregistering interface 2-2:1.0
> > /home/amr/linux-2.6.26/drivers/usb/serial/magtek.c:
> magtek_shutdown
> > magtek ttyUSB0: Magtek 75/Excella USB card reader
> converter now disconnected from ttyUSB0
> > magtek 2-2:1.0: device disconnected
> > usb 2-2:1.0: uevent
> > usb 2-2: uevent
> > hub 2-0:1.0: debounce: port 2: total 100ms stable
> 100ms status 0x100
> > usb usb2: suspend_rh (auto-stop)
> > ehci_hcd 0000:00:1d.7: devpath 5 ep2in 3strikes
> > /home/amr/linux-2.6.26/drivers/usb/serial/magtek.c:
> magtek_read_int_callback - port 1
> > usb 1-5: unlink qh0-00ff/dec56380 start 0 [1/0 us]
> > usb 1-5: link qh0-00ff/dec56380 start 0 [1/0 us]
> > usb 1-5: unlink qh0-00ff/dec56380 start 0 [1/0 us]
> > ehci_hcd 0000:00:1d.7: HC died; cleaning up
>
> You should try using the patch in this message:
>
>
http://marc.info/?l=linux-usb&m=121848784300960&w=2
>
> If that doesn't help, can you test this on another
> computer to see if
> the same thing happens?
>
> For future testing, it would help if you enable
> CONFIG_PRINTK_TIME.
>
> Alan Stern
