Merge branches 'release', 'bugzilla-8570', 'bugzilla-9966', 'bugzilla-9998', 'bugzill...

[pandora-kernel.git] / drivers / acpi / ec.c

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index caf873c..e7e197e 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -129,6 +129,7 @@ static struct acpi_ec {
        struct mutex lock;
        wait_queue_head_t wait;
        struct list_head list;
+       atomic_t irq_count;
        u8 handlers_installed;
 } *boot_ec, *first_ec;
 
@@ -181,6 +182,8 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
 {
        int ret = 0;
 
+       atomic_set(&ec->irq_count, 0);
+
        if (unlikely(event == ACPI_EC_EVENT_OBF_1 &&
                     test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags)))
                force_poll = 1;
@@ -227,6 +230,7 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
                while (time_before(jiffies, delay)) {
                        if (acpi_ec_check_status(ec, event))
                                goto end;
+                       msleep(5);
                }
        }
        pr_err(PREFIX "acpi_ec_wait timeout,"
@@ -529,6 +533,13 @@ static u32 acpi_ec_gpe_handler(void *data)
        struct acpi_ec *ec = data;
 
        pr_debug(PREFIX "~~~> interrupt\n");
+       atomic_inc(&ec->irq_count);
+       if (atomic_read(&ec->irq_count) > 5) {
+               pr_err(PREFIX "GPE storm detected, disabling EC GPE\n");
+               acpi_disable_gpe(NULL, ec->gpe, ACPI_ISR);
+               clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
+               return ACPI_INTERRUPT_HANDLED;
+       }
        clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
        if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
                wake_up(&ec->wait);
@@ -943,11 +954,7 @@ int __init acpi_ec_ecdt_probe(void)
                boot_ec->command_addr = ecdt_ptr->control.address;
                boot_ec->data_addr = ecdt_ptr->data.address;
                boot_ec->gpe = ecdt_ptr->gpe;
-               if (ACPI_FAILURE(acpi_get_handle(NULL, ecdt_ptr->id,
-                               &boot_ec->handle))) {
-                       pr_info("Failed to locate handle for boot EC\n");
-                       boot_ec->handle = ACPI_ROOT_OBJECT;
-               }
+               boot_ec->handle = ACPI_ROOT_OBJECT;
        } else {
                /* This workaround is needed only on some broken machines,
                 * which require early EC, but fail to provide ECDT */