EHCI port reset problem

Hi everyone!!

I am Minhyoung Kim working for LG Electronics and a beginner in USB device
driver.
I found a bug that EHCI port is in reset forever, when I repeated the
following action.
Action : Immediately disconnecting a USB device just after connecting the
device.

In this situation, ehci_hub_status_data is executed prior to
ehci_hub_control which is called by get_port_status.

ehci_hub_status_data function set ehci->reset_done to zero because no
device is present.
So, ehci_hub_control can¡¯t clear PORT_RESET bit. 

This is my test environment:
Kernel Version - 2.6.12
USB controller - Broadcom (EHCI/OHCI)

First, I wonder if this kind of bug is already reported. If so, please, let
me know a patch.
(I tried to find a similar problem in linux-usb-devel email archive, but I
didn¡¯t find anything.)

Second, I wonder why ehci_hub_status_data doesn¡¯t check PORT_RESET status
before setting ehci->reset_done to zero.
When I modified ehci_hub_status_data like the following, the problem is
cleared.

Before:
if (!(temp & PORT_CONNECT))
             ehci->reset_done [i] = 0;

After: 
if (!(temp & PORT_CONNECT) && !(temp & PORT_RESET))
             ehci->reset_done [i] = 0;

I always really thank for your help and effort.
Regards,
Minhyoung Kim


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