GPIO interrupt can not call correct ISR function

Hi,

We use some GPIOs as KEY function in our product, here are hardware and software specification:
1. Hardware
a. Hardware connection:
PIN#11(Linux GPIO 17) <-------- KEY_1
PIN#13(Linux GPIO 27) <-------- KEY_2
PIN#15(Linux GPIO 22) <-------- KEY_3
PIN#19(Linux GPIO 10) <-------- KEY_4
PIN#21(Linux GPIO 9) <-------- KEY_5
PIN#23(Linux GPIO 11) <-------- KEY_6
PIN#25 <-------- KEY_GND
PIN#29(Linux GPIO 5) <-------- KEY_7
PIN#31(Linux GPIO 6) <-------- KEY_8
b. Pull-up resistors:
Add 10k external pull-up resistors for each KEY line.

2. Software
   a. Reconfigure all KEY pins as GPIO/input in BIOS.
   b. Ubilinux 4.0 installed on UP board(http://ubilinux.org/download/iso/v4.0/ubilinux-installer-4.0.iso)
   c. Test the hardware connection by sysfs GPIO attribute file pass:
   i. The 'cat value' return 0 when key pressed, return 1 when no press.
   d. Write a LKM driver for this KEY function.

The problem we encountered is that:
1. During LKM probing, we can found all KEY GPIOs get different irq number, which means there are not sharing interrupts among them:
[ 210.677045] up_keys up_keys: gpio_keys_setup_key: gpio = 17, irq = 314.
[ 210.677167] up_keys up_keys: gpio_keys_setup_key: gpio = 27, irq = 324.
[ 210.677328] up_keys up_keys: gpio_keys_setup_key: gpio = 22, irq = 319.
[ 210.677453] up_keys up_keys: gpio_keys_setup_key: gpio = 10, irq = 307.
[ 210.677575] up_keys up_keys: gpio_keys_setup_key: gpio = 9, irq = 306.
[ 210.677792] up_keys up_keys: gpio_keys_setup_key: gpio = 11, irq = 308.
[ 210.680226] up_keys up_keys: gpio_keys_setup_key: gpio = 5, irq = 302.
[ 210.681917] up_keys up_keys: gpio_keys_setup_key: gpio = 6, irq = 303.
2. Once driver load completed, we press one KEY, then weird thing happend:
KEY_1 pressed, the isr we register for GPIO17 get called: Correct
KEY_2 pressed, the isr we register for GPIO11 get called: NOT OK, WHY??
KEY_3 pressed, the isr we register for GPIO11 get called: NOT OK neither
KEY_4 pressed, the isr we register for GPIO11 get called: NOT OK neither
KEY_5 pressed, the isr we register for GPIO11 get called: NOT OK neither
KEY_6 pressed, the isr we register for GPIO11 get called: Correct
KEY_7 pressed, the isr we register for GPIO6 get called: NOT OK, WHY??
KEY_8 pressed, the isr we register for GPIO6 get called: Correct

Any one has any thoughts, please??

Best Regards
Thanks

Jasper