ACPI: ec: Query only single query at a time.

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 8 insertions, 11 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index acfe8830da1..a85f795ab4e 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -104,6 +104,7 @@ struct acpi_ec {
         unsigned long data_addr;
         unsigned long global_lock;
         struct semaphore sem;
+        atomic_t query_pending;
         atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
         wait_queue_head_t wait;
 } *ec_ecdt;
@@ -257,6 +258,8 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
                              command);
                         goto end;
                 }
+        } else if (command == ACPI_EC_COMMAND_QUERY) {
+                atomic_set(&ec->query_pending, 0);
         }
 
         for (; rdata_len > 0; rdata_len --) {
@@ -425,17 +428,9 @@ static void acpi_ec_gpe_query(void *ec_cxt)
 {
         struct acpi_ec *ec = (struct acpi_ec *)ec_cxt;
         u8 value = 0;
-        static char object_name[8];
+        char object_name[8];
 
-        if (!ec)
-                return;
-
-        value = acpi_ec_read_status(ec);
-
-        if (!(value & ACPI_EC_FLAG_SCI))
-                return;
-
-        if (acpi_ec_query(ec, &value))
+        if (!ec || acpi_ec_query(ec, &value))
                 return;
 
         snprintf(object_name, 8, "_Q%2.2X", value);
@@ -457,7 +452,8 @@ static u32 acpi_ec_gpe_handler(void *data)
         }
 
         value = acpi_ec_read_status(ec);
-        if (value & ACPI_EC_FLAG_SCI) {
+        if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) {
+                atomic_set(&ec->query_pending, 1);
                 status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec);
         }
 
@@ -652,6 +648,7 @@ static int acpi_ec_add(struct acpi_device *device)
         ec->handle = device->handle;
         ec->uid = -1;
         init_MUTEX(&ec->sem);
+        atomic_set(&ec->query_pending, 0);
         if (acpi_ec_mode == EC_INTR) {
                 atomic_set(&ec->leaving_burst, 1);
                 init_waitqueue_head(&ec->wait);