From: Davin McCall <davmac@ozonline.com.au>

Set hwif->chipset to ide_forced if it was forced by kernel parameters.

Set hwif->chipset to ide_generic for hwifs controlled by generic IDE
code, so they wont be taken by setup_pci.c:ide_match_hwif().

Patch also fixes /proc/ide/ideX/model to report "generic" instead of
"(none)" for default hwifs.

This has been in -mm since 2.6.1-mm1.