request_irq succeeds but interrupt is never detected

request_irq succeeds but interrupt is never detected

References

Reference NO 1

http://stackoverflow.com/questions/13650564/request-irq-succeeds-but-interrupt-is-never-detected

Reference NO 2

http://stackoverflow.com/questions/13540173/request-irq-successful-handler-not-called

Reference NO 3

http://www.makelinux.net/books/lkd2/ch06lev1sec4

Reference NO 4

http://lwn.net/images/pdf/LDD3/ch10.pdf

Reference NO 5

http://www.linuxquestions.org/questions/linux-embedded-and-single-board-computer-78/request_irq-returns-successfully-but-isr-is-not-execute-823091/

Reference NO 6

https://www.kernel.org/doc/Documentation/PCI/MSI-HOWTO.txt

Reference NO 7

http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/Documentation/PCI/MSI-HOWTO.txt

Reference NO 8

http://student.cosy.sbg.ac.at/~tstuetz/out/ldd/ch5_ldd.pdf