[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    [W:0.024 / U:10.136 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site