Hi, There is an old bug come up while migrating from 2.6.18 to 2.6.33....The interrupts were generating correctly in 2.6.18 where the interrupt was registered using SA_INTERRUPT then while migrating to 2.6.33 this has been changed to IRQF_DISABLED this is the only change in migration... after doing this interrupt comes only once .Interrupts does not behave how they were used to in 2.6.18. Are any additional changes needs to be done here??? ...to get things working here... what could be the problem here....I dont have the option of moving to latest kernel... Praveen R