[Linux-parport] [PATCH/RFC] parport_pc: remove ancient, overeager quirk that disables EPP support on many chipsets

Bastien ROUCARIES roucaries.bastien at gmail.com
Thu Sep 15 09:41:56 EDT 2011

On Thu, Sep 15, 2011 at 2:41 PM, Leopold Palomo-Avellaneda
<leo at alaxarxa.net> wrote:
> Hi again,
> sorry for the noise and my mistake. The patch...
> there's a bug in the parport module that have been reported (in another
> places) some time ago [1]. Also, this bug was reported at Redhat [2], but
> nobody follow the report and it was closed.
> As Adam Baker said [1] :
> <quote>
> A long time ago (~ 10 years), Intel produced a chipset that

Why not check dmi years for this test and do the test only for board
before 2000 ? Better safe than sorry


> included broken EPP support. The Linux parport driver was written to detect
> such a chipset and disable EPP support on it. Unfortunately the test that was
> written gives false positives for many current chipsets and no-one seems to
> know exactly what the problem hardware was, let alone have a sample of it to
> see if a better test can be written. After such a long time it is probably
> appropriate to just remove the test (on average it does more harm than good)
> however you are correct in asserting the driver is unmaintained so no-one is
> bothering to fix it.
> </quote>
> I have applied the patch to the standard debian kernel and vanilla kernels and
> runs perfectly. The patch simply erases a check. Applied to some Dell
> hardware, now the EPP mode is detected and, after some initial tests it's
> working.
> Please, apply the patch.
> Best regards,
> Leo
> [1] http://lists.infradead.org/pipermail/linux-parport/2008-March/000628.html
> [2] https://bugzilla.redhat.com/show_bug.cgi?id=284471
> Signed-off-by: Adam Baker <linux at baker-net.org.uk>
> Signed-off-by: Leopold Palomo-Avellaneda <leo at alaxarxa.net>
> ---

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