[alsa-devel] [PATCH] netwinder: nw_gpio_lock is a raw_spinlock_t

David Woodhouse dwmw2 at infradead.org
Tue May 29 12:11:08 CEST 2012

On Tue, 2012-05-29 at 12:06 +0200, Christian Dietrich wrote:
> Since nw_gpio_lock is a raw_spinlock_t it should be used with the
> raw_spinlock_* functions and not the spinlock_* variants. Functionally
> this is equivalent at the moment, because the raw_spinlock_t is the
> first field of spinlock_t, and therefore &nw_gpio_lock ==
> &(nw_gpio_lock->rlock). But when other spinlock_t functions use other
> field they read and write random memory.

Hm, why are we exposing a raw spinlock to drivers? 

Should we export a helper function (or macro, I suppose) which does the
appropriate locking *and* the GPIO operation?

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