===================================================================
@@ -76,8 +76,9 @@ enum ec_command {
enum {
EC_FLAGS_QUERY_PENDING, /* Query is pending */
EC_FLAGS_GPE_STORM, /* GPE storm detected */
- EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and
+ EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and
* OpReg are installed */
+ EC_FLAGS_SUSPENDED, /* Driver is suspended */
};
/* If we find an EC via the ECDT, we need to keep a ptr to its context */
@@ -291,6 +292,10 @@ static int acpi_ec_transaction(struct ac
if (t->rdata)
memset(t->rdata, 0, t->rlen);
mutex_lock(&ec->lock);
+ if (test_bit(EC_FLAGS_SUSPENDED, &ec->flags)) {
+ status = -EBUSY;
+ goto unlock;
+ }
if (ec->global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status)) {
@@ -1059,16 +1064,26 @@ error:
static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
{
struct acpi_ec *ec = acpi_driver_data(device);
+
+ mutex_lock(&ec->lock);
+ /* Prevent transactions from happening while suspended */
+ set_bit(EC_FLAGS_SUSPENDED, &ec->flags);
/* Stop using GPE */
acpi_disable_gpe(NULL, ec->gpe);
+ mutex_unlock(&ec->lock);
return 0;
}
static int acpi_ec_resume(struct acpi_device *device)
{
struct acpi_ec *ec = acpi_driver_data(device);
+
+ mutex_lock(&ec->lock);
/* Enable use of GPE back */
acpi_enable_gpe(NULL, ec->gpe);
+ /* Allow transactions to happen again */
+ set_bit(EC_FLAGS_SUSPENDED, &ec->flags);
+ mutex_unlock(&ec->lock);
return 0;
}