Re: PCMCIA product id strings -> hashes generation at compilation time? [Was: Re: [patch 14/38] pcmcia: id_table for wavelan_cs]

From: Andrew Morton (akpm_at_osdl.org)
Date: 03/08/05

  • Next message: Christoph Lameter: "Re: [patch] del_timer_sync scalability patch" 
    Date:	Tue, 8 Mar 2005 12:34:26 -0800
To: Dominik Brodowski <linux@dominikbrodowski.net>

    Dominik Brodowski <linux@dominikbrodowski.net> wrote:
    >
    > Most pcmcia devices are matched to drivers using "product ID strings"
    > embedded in the devices' Card Information Structures, as "manufactor ID /
    > card ID" matches are much less reliable. Unfortunately, these strings cannot
    > be passed to userspace for easy userspace-based loading of appropriate
    > modules (MODNAME -- hotplug), so my suggestion is to also store crc32 hashes
    > of the strings in the MODULE_DEVICE_TABLEs, e.g.:
    >
    > PCMCIA_DEVICE_PROD_ID12("LINKSYS", "E-CARD", 0xf7cb0b07, 0x6701da11),

    What is the difficulty in passing these strings via /sbin/hotplug arguments?

    > ...
    > To make the life easier for device driver authors,
    > - a big warning is put into dmesg if a pcmcia driver is inserted
    > into the kernel and the hash mentioned in PCMCIA_DEVICE_PROD_ID()
    > is incorrect,

    As long as the kernel shouts loudly at the driver developer at
    development-time, and that shouting mentions a bit of documentation in
    Documentation/somewhere, I expect we'll be OK.

    -
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  • Next message: Christoph Lameter: "Re: [patch] del_timer_sync scalability patch"

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