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Refine description in request_threaded_irq usage

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Yo-Jung Lin 2024-04-20 12:32:36 +08:00 committed by Jim Huang
parent 0c3aaac3c1
commit 86b5e86e5b
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lkmpg.tex
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@ -1957,7 +1957,8 @@ Usage of other parameters are the same as \cpp|request_irq()|.
Presence of both handlers is not mandatory.
If either of them is not needed, pass the \cpp|NULL| instead.
A \cpp|NULL| top-half handler implicitly means doing nothing but waking up the bottom-half serving thread (for running the bottom-half handler); A \cpp|NULL| bottom-half handler would have the same effect as if \cpp|request_irq()| were used.
A \cpp|NULL| top-half handler implies that no action is taken except to wake up the bottom-half serving thread, which runs the bottom-half handler.
Similarly, a \cpp|NULL| bottom-half handler effectively acts as if \cpp|request_irq()| were used.
In fact, this is how \cpp|request_irq()| is implemented.
Note that passing \cpp|NULL| to both handlers is considered an error and will make registration fail.