From: David Brownell <david-b@pacbell.net>
To: Vitaly Wool <vwool@ru.mvista.com>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org,
spi-devel-general@lists.sourceforge.net
Subject: Re: [spi-devel-general] [patch 2.6.15-rc5-mm2] SPI, priority inversion tweak
Date: Tue, 13 Dec 2005 14:21:09 -0800 [thread overview]
Message-ID: <200512131421.10231.david-b@pacbell.net> (raw)
In-Reply-To: <439F4206.2040406@ru.mvista.com>
On Tuesday 13 December 2005 1:49 pm, Vitaly Wool wrote:
> So you're turning this to be unsafe if the buffer is in use, right? Funny...
I have no idea what you mean by that comment. The parameters to that
function have always been documented as "will copy", and the two branches
(busy/not) differ only in _which_ buffer they use from the heap (the
fast pre-allocated one, or a freshly allocated scratch buffer). Heap
buffers are by definition DMA-safe.
- Dave
> David Brownell wrote:
>
> >This is an updated version of the patch from Mark Underwood, handling
> >the no-memory case better and using SLAB_KERNEL not SLAB_ATOMIC.
> >
>
next prev parent reply other threads:[~2005-12-13 22:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-13 18:28 [patch 2.6.15-rc5-mm2] SPI, priority inversion tweak David Brownell
2005-12-13 21:49 ` [spi-devel-general] " Vitaly Wool
2005-12-13 22:21 ` David Brownell [this message]
2005-12-14 6:43 ` Vitaly Wool
2005-12-14 6:47 ` Vitaly Wool
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