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ACPICA: GPE detect optimization - ignore unused GPE registers

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This optimization will simply ignore GPE registers that contain
no enabled GPEs - there is no need to read the register.
ACPICA bugzilla 884.

http://www.acpica.org/bugzilla/show_bug.cgi?id=884

Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Bob Moore <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Lin Ming 2011-02-14 15:29:34 +08:00 • committed by Len Brown
commit 6dfad33964
1 changed files with 9 additions and 0 deletions
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9
drivers/acpi/acpica/evgpe.c
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@ -373,6 +373,15 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
gpe_register_info = &gpe_block->register_info[i];
/*
* Optimization: If there are no GPEs enabled within this
* register, we can safely ignore the entire register.
*/
if (!(gpe_register_info->enable_for_run |
gpe_register_info->enable_for_wake)) {
continue;
}
/* Read the Status Register */
status =