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ACPICA: Optimize ACPI register locking

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Removed locking for reads from the ACPI bit registers in PM1
Status, Enable, Control, and PM2 Control. The lock is not required
when reading the single-bit registers. The acpi_get_register_unlocked
function is no longer needed and has been removed. This will
improve performance for reads on these registers.  ACPICA BZ 760.

http://www.acpica.org/bugzilla/show_bug.cgi?id=760

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore
2009-02-18 15:10:07 +08:00
committed by Len Brown
parent ec41f193ea
commit 9892dd23cb
4 changed files with 29 additions and 42 deletions
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2
drivers/acpi/processor_idle.c
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@@ -800,7 +800,7 @@ static int acpi_idle_bm_check(void)
{
u32 bm_status = 0;
acpi_get_register_unlocked(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
if (bm_status)
acpi_set_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
/*