On Mon, 13 Sep 1999 07:01:41 -0700 (PDT), Robert Dinse
<nanook@eskimo.com> said:
> Are there ever cases where you lock outside of interrupts but
> expect code inside of an interrupt handler to unlock? Or
> conversely, cases where you lock during an interrupt, do some
> preliminary work, then return expecting code outside to unlock?
For IO it is very common: we lock a page or a buffer_head before
submitting the IO, and the interrupt unlocks it afterwards. This is
always the blocking, wait-queue based type of locking, though: we
never do this with spinlocks.
--Stephen
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