linux-kernel - Re: [PATCH 03/12] hdaps: Unify and cache hdaps readouts

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Date:	Tue, 8 Aug 2006 12:09:38 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Shem Multinymous <multinymous@...il.com>
Cc:	Robert Love <rlove@...ve.org>, Jean Delvare <khali@...ux-fr.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, hdaps-devel@...ts.sourceforge.net
Subject: Re: [PATCH 03/12] hdaps: Unify and cache hdaps readouts

Hi!

> >        /* Parse position data: */
> >        x = *(s16*)(data.val+EC_ACCEL_IDX_XPOS1);
> >        y = *(s16*)(data.val+EC_ACCEL_IDX_YPOS1);
> >        transform_axes(&x, &y);
> >
> >...which looks even better to me.
> 
> Yes, that's elegant.
> But it made me realize there's a race condition here (and and also in
> the mainline driver): the global pos_x, rest_x etc. could be updated
> while an attribute's show_* function is called. Ugh. I guess I need to
> sprinkle spinlocks all over the place.

They are simple integers... so yes, locking is needed, but I'd not
label it as critical. I guess you should get your series done, first.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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