Bottom half trigger function never called when using the sysfs trigger

[Lars-Peter Clausen <lars@xxxxxxxxxx>]

hi,

The sysfs trigger uses iio_trigger_poll_chained which calls
handle_nested_irq. The problem now is that for nested IRQs the primary
handler is not called. Which obviously breaks drivers which have a bottom
half trigger function.

This behaviour was introduced in commit 1f785681 ("staging:iio:trigger sysfs
userspace trigger rework."). The commit message says you are "awaiting
comments on using the nested_irq_trick", but not why it is necessary to use
nested IRQs. And honestly I don't get why it would be necessary either.
handle_nested_irq is supposed to be used with chained IRQs if we are already
running in a thread handler of parent. Neither seems to be true here.

- Lars
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