I'm writing a driver for a PCI based Dual UART controller and there is disparity in the IRQ line assignments I'm getting from sysfs (IRQ 169 ) and config space (IRQ 05). I tried writing a shared interrupt handler using IRQ 5 but I got a message (irq 169: nobody cared (try booting with the "irqpoll" option)). I'm showing the screen outputs for both the methods below

Method 1: Gives IRQ 169
cat sys/bus/pci/devices/0000\:03\:00.0/ irq
169
Method 2:: gives IRQ 05
od -x sys/bus/pci/devices/0000\:03\:00.0 config
0000000 9710 9835 0003 0280 0201 0700 0010 0000
0000020 cf01 0000 ce01 0000 cd01 0000 cc01 0000
0000040 cb01 0000 ca01 0000 0000 0000 1000 0002
0000060 0000 0000 0000 0000 0000 0000 0105 0000
0000100 8080 0000 0000 0000 0000 0000 0000 0000
0000120 0000 0000 0000 0000 0000 0000 0000 0000
*
0000400

IRQ 5 seems to be right , but IRQ 169 seems to be coming in the way. Could someone tell me why this happens?

thanks
Sebefore