linux/drivers/pnp/pnpacpi
Bjorn Helgaas f238b414a7 PNPACPI: compute Address Space length rather than using _LEN
ACPI _CRS Address Space Descriptors have _MIN, _MAX, and _LEN.  Linux has
been computing Address Spaces as [_MIN to _MIN + _LEN - 1].  Based on the
tests in the bug reports below, Windows apparently uses [_MIN to _MAX].

Per spec (ACPI 4.0, Table 6-40), for _CRS fixed-size, fixed location
descriptors, "_LEN must be (_MAX - _MIN + 1)", and when that's true, it
doesn't matter which way we compute the end.  But of course, there are
BIOSes that don't follow this rule, and we're better off if Linux handles
those exceptions the same way as Windows.

This patch makes Linux use [_MIN to _MAX], as Windows seems to do.  This
effectively reverts 3162b6f0c5 and replaces it with simpler code.

    https://bugzilla.kernel.org/show_bug.cgi?id=14337 (round)
    https://bugzilla.kernel.org/show_bug.cgi?id=15480 (truncate)

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2010-04-28 21:44:49 -04:00
..
core.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
Kconfig ACPI: always enable CONFIG_PNPACPI on CONFIG_ACPI kernels 2007-02-15 22:38:04 -05:00
Makefile PNP: remove old CONFIG_PNP_DEBUG option 2008-10-10 23:35:33 -04:00
pnpacpi.h PNPACPI: move _CRS/_PRS warnings closer to the action 2008-04-29 03:22:30 -04:00
rsparser.c PNPACPI: compute Address Space length rather than using _LEN 2010-04-28 21:44:49 -04:00