diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-06-27 16:35:52 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-06-27 17:06:51 +0200 |
| commit | b5539eb5ee70257520e40bb636a295217c329a50 (patch) | |
| tree | 4ec845bc4cc1ff96763d168e855730c54774d29c | |
| parent | bb6950556d4b1dd1226c1f09e84b53cb37e5340f (diff) | |
| download | livepatching-b5539eb5ee70257520e40bb636a295217c329a50.tar.gz | |
ACPI: EC: Fix acpi_ec_dispatch_gpe()
Commit 896e97bf99ec ("ACPI: EC: Clear GPE on interrupt handling only")
broke suspend-to-idle at least on Dell XPS13 9360 and 9380.
The problem is that acpi_ec_dispatch_gpe() must clear the EC GPE,
because the EC GPE handler never runs when the system is in the
suspend-to-idle state and if the EC GPE is not cleared by the suspend-
to-idle loop, it is never cleared at all which leads to a GPE storm.
This causes suspend-to-idle to burn energy instead of saving it which
is potentially dangerous (the affected machines heat up rather badly
when that happens).
Addess this by making acpi_ec_dispatch_gpe() clear the EC GPE as it did
before.
Fixes: 896e97bf99ec ("ACPI: EC: Clear GPE on interrupt handling only")
Tested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/ec.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 8569f55e55b6c..660834a49c1f9 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -1267,12 +1267,8 @@ static void acpi_ec_event_handler(struct work_struct *work) spin_unlock_irq(&ec->lock); } -static void acpi_ec_handle_interrupt(struct acpi_ec *ec) +static void clear_gpe_and_advance_transaction(struct acpi_ec *ec, bool interrupt) { - unsigned long flags; - - spin_lock_irqsave(&ec->lock, flags); - /* * Clear GPE_STS upfront to allow subsequent hardware GPE_STS 0->1 * changes to always trigger a GPE interrupt. @@ -1289,6 +1285,16 @@ static void acpi_ec_handle_interrupt(struct acpi_ec *ec) acpi_clear_gpe(NULL, ec->gpe); advance_transaction(ec, true); +} + +static void acpi_ec_handle_interrupt(struct acpi_ec *ec) +{ + unsigned long flags; + + spin_lock_irqsave(&ec->lock, flags); + + clear_gpe_and_advance_transaction(ec, true); + spin_unlock_irqrestore(&ec->lock, flags); } @@ -2083,7 +2089,7 @@ bool acpi_ec_dispatch_gpe(void) if (acpi_ec_gpe_status_set(first_ec)) { pm_pr_dbg("ACPI EC GPE status set\n"); - advance_transaction(first_ec, false); + clear_gpe_and_advance_transaction(first_ec, false); work_in_progress = acpi_ec_work_in_progress(first_ec); } |