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Andy Whitcroft authored
commit 867f9d463b82462793ea4610e748be0b04b37fc7 upstream. The recently merged change (in v3.14-rc6) to ACPI resource detection (below) causes all zero length ACPI resources to be elided from the table: commit b355cee88e3b1a193f0e9a81db810f6f83ad728b Author: Zhang Rui <rui.zhang@intel.com> Date: Thu Feb 27 11:37:15 2014 +0800 ACPI / resources: ignore invalid ACPI device resources This change has caused a regression in (at least) serial port detection for a number of machines (see LP#1313981 [1]). These seem to represent their IO regions (presumably incorrectly) as a zero length region. Reverting the above commit restores these serial devices. Only elide zero length resources which lie at address 0. Fixes: b355cee88e3b (ACPI / resources: ignore invalid ACPI device resources) Signed-off-by: Andy Whitcroft <apw@canonical.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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