synchronize_irq() before free_irq()

[Frank.A.Uepping@xxxxxxxxxxx (Frank.A.Uepping)]

Hi,
what is the reason for having a synchronize_irq() immediately before a
free_irq()?  Does not free_irq() synchronize implicitly?

E.g., in drivers/net/pci-skeleton.c#L1752

Thanks
 FAU

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