[lkml]   [2008]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] fsldma: remove internal self-test from Freescale Elo DMA driver
On Tue, Sep 23, 2008 at 1:29 PM, Timur Tabi <> wrote:
> The Freescale Elo DMA driver runs an internal self-test before registering
> the channels with the DMA engine. This self-test has a fundemental flaw in
> that it calls the DMA engine's callback functions directly before the
> registration. However, the registration initializes some variables that the
> callback functions uses, namely the device struct.
> The code works today because there are two device structs: the one created
> by the DMA engine, and one created by the Open Firmware (OF) subsystem. The
> self-test currently uses the device struct created by OF. However, in the
> future, some of the device structs created by OF will be eliminated.
> This means that the self-test will only have access to the device struct
> created by the DMA engine. But this device struct isn't initialized when
> the self-test runs, and this causes a kernel panic.
> Since there is already a DMA test module (dmatest), the internal self-test
> code is not useful anyway. It is extremely unlikely that the test will fail
> in normal usage. It may have been helpful during development, but not any more.
> Signed-off-by: Timur Tabi <>
> ---
> This patch is for 2.6.28.

Applied to the 'next' [1] branch.



 \ /
  Last update: 2008-09-24 19:01    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean