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Description of problem:

If IRQ disappears and reappears later the IRQ is not balanced correctly due to overflow in irq_count (as the counter got smaller and difference cause overflow).
Rescan if this happens fix the problem.

Version-Release number of selected component (if applicable):
irqbalance-1.0.7-8

How reproducible:
Reproducible when a device disappears and reappears, for example when vm has high network load on aws vms with an enavf device

Steps to Reproduce:
1. Make a device disappears and reappears
2.
3.

Actual results:
the IRQ is not balanced correctly when a device disappears and reappears


Expected results:
the IRQ is balanced correctly


Additional info:
ENA driver resets look like they deassign and reassign the IRQs thus resetting counts.
This is fixed in version 1.0.8 thanks to this patch "Balance correctly IRQs reappearing" :
https://github.com/Irqbalance/irqbalance/commit/93ed80181e0ce7b81bc88a67fabad1ad829fc460

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:1896