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

From: Andrew Morton
Date: Tue Mar 08 2005 - 15:58:48 EST

Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx> 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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