diff options
| author | Bob Moore <robert.moore@intel.com> | 2008-06-13 04:28:55 +0400 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2008-07-17 01:27:01 +0400 |
| commit | e38e8a0743b0e996a8a3fbea8908fe75a84f02c7 (patch) | |
| tree | 93dbf03e5c1eff275742989d9b05cb1892c18fe4 /drivers/acpi/events | |
| parent | 87dc5e3218ba3d7a9293f9113f58455747a233ac (diff) | |
| download | linux-e38e8a0743b0e996a8a3fbea8908fe75a84f02c7.tar.xz | |
Make GPE disable more robust
Implemented another change for the GPE disable. We now perform a
read-change-write of the enable register instead of simply writing out the
cached enable mask. This will prevent inadvertent enabling of GPEs if a rogue
GPE is received during initialization (before GPE handlers are installed.)
http://bugzilla.kernel.org/show_bug.cgi?id=6217
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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'drivers/acpi/events')
| -rw-r--r-- | drivers/acpi/events/evgpe.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/acpi/events/evgpe.c b/drivers/acpi/events/evgpe.c index 5354be44f876..e0339d4139a4 100644 --- a/drivers/acpi/events/evgpe.c +++ b/drivers/acpi/events/evgpe.c @@ -256,7 +256,7 @@ acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info) return_ACPI_STATUS(status); } - /* Mark wake-disabled or HW disable, or both */ + /* Clear the appropriate enabled flags for this GPE */ switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) { case ACPI_GPE_TYPE_WAKE: @@ -273,13 +273,23 @@ acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info) /* Disable the requested runtime GPE */ ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED); - - /* fallthrough */ + break; default: - acpi_hw_write_gpe_enable_reg(gpe_event_info); + break; } + /* + * Even if we don't know the GPE type, make sure that we always + * disable it. low_disable_gpe will just clear the enable bit for this + * GPE and write it. It will not write out the current GPE enable mask, + * since this may inadvertently enable GPEs too early, if a rogue GPE has + * come in during ACPICA initialization - possibly as a result of AML or + * other code that has enabled the GPE. + */ + status = acpi_hw_low_disable_gpe(gpe_event_info); + return_ACPI_STATUS(status); + return_ACPI_STATUS(AE_OK); } |