linux-kernel - Re: [FOR 2.6.18 FIX][PATCH] drm: radeon flush TCL VAP for vertex program enable/disable

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Date:	Thu, 31 Aug 2006 08:27:13 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Andrew Morton <akpm@...l.org>, Dave Airlie <airlied@...ux.ie>,
	linux-kernel@...r.kernel.org
Subject: Re: [FOR 2.6.18 FIX][PATCH]  drm: radeon flush TCL VAP for vertex
	program enable/disable

On Wed, 2006-08-30 at 15:53 -0700, Linus Torvalds wrote:
> 
> On Wed, 30 Aug 2006, Andrew Morton wrote:
> > 
> > That's a somewhat weird-looking patch.  It adds code which is quite
> > dissimilar from all the other cases in that switch statement.
> 
> It looks ok to me, although you have to look into the caller to see why it 
> does what it does.
> 
> It would be "prettier" if it changed the size and data of the incoming 
> packet instead, but the code as is isn't actually set up to be able to do 
> that (the size setup and verification stuff is done before the fixup).
> 
> That said, I'd have expected that the VAP state flush is really something 
> that the _client_ should do when it generates the commands, not the kernel 
> after the fact. 

but the client is unprivileged userspace!
The kernel needs to ensure correctness and probably even enforce it.


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