Re: PATCH: Fix ide probe double detection

From: Doug Maxey (dwm_at_austin.ibm.com)
Date: 07/29/04

  • Next message: Jesse Barnes: "Re: [Lse-tech] [RFC][PATCH] Change pcibus_to_cpumask() to pcibus_to_node()" 
    To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date:	Thu, 29 Jul 2004 10:56:38 -0500

    On Thu, 29 Jul 2004 13:22:44 +1000, Benjamin Herrenschmidt wrote:
    >On Wed, 2004-07-28 at 08:46, Alan Cox wrote:
    >> Some devices don't decode master/slave - notably PCMCIA adapters.
    >> Unfortunately for us some also do, which makes it hard to guess if we
    >> should probe the slave.
    >>
    >> This patch fixes the problem by probing the slave and then using the model
    >> and serial information to spot undecoded pairs. An additional check is done
    >> to catch pairs of pre ATA devices just in case.
    >
    >What about checking if drive->select sticks ? And if that doesn't work,
    >something like
    >
    >- select 0
    >- write a value to reg X
    >- select 1
    >- write a different value to reg X
    >- select 0
    >- check value
    >
    >reg X could be nsect or such ...
    >
    >I don't like relying on drive->id and serial_no, but that may just be
    >paranoia...
    >
    >Ben.

    One strategy would be to reverse the order of probes, doing drive 1 first,
    then drive 0. When I was working IDE in AIX, we had some ATAPI devices that
    were recalcitrant until the strategy was switched to 1,0 order

    ++doug
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  • Next message: Jesse Barnes: "Re: [Lse-tech] [RFC][PATCH] Change pcibus_to_cpumask() to pcibus_to_node()"

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