From: Myron Stowe <myron.stowe@hp.com>
Date: Thu, 21 Oct 2010 20:23:53 +0000 (-0600)
Subject: ACPI: Maintain a list of ACPI memory mapped I/O remappings
X-Git-Tag: v2.6.37-rc1~100^2~1^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=620242ae8c3d9c0b1a77451744fb2d855d1e7342;p=pandora-kernel.git

ACPI: Maintain a list of ACPI memory mapped I/O remappings

For memory mapped I/O (MMIO) remappings, add a list to maintain the
remappings and augment the corresponding mapping and unmapping interface
routines (acpi_os_map_memory() and acpi_os_unmap_memory()) to
dynamically add to, and delete from, the list.

The current ACPI I/O accessing methods - acpi_read() and acpi_write() -
end up calling ioremap() when accessing MMIO.  This prevents use of these
methods within interrupt context (IRQ and/or NMI), since ioremap() may
block to allocate memory.  Maintaining a list of MMIO remappings enables
accesses to such areas from within interrupt context provided they have
been pre-mapped.

Signed-off-by: Myron Stowe <myron.stowe@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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