1 files changed, 23 insertions, 16 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index e08cf98f504f..82f496c07675 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -147,9 +147,10 @@ static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event,
         return 0;
 }
 
-static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count)
+static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event,
+                        unsigned count, int force_poll)
 {
-        if (acpi_ec_mode == EC_POLL) {
+        if (unlikely(force_poll) || acpi_ec_mode == EC_POLL) {
                 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
                 while (time_before(jiffies, delay)) {
                         if (acpi_ec_check_status(ec, event, 0))
@@ -173,14 +174,15 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count)
 
 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
                                         const u8 * wdata, unsigned wdata_len,
-                                        u8 * rdata, unsigned rdata_len)
+                                        u8 * rdata, unsigned rdata_len,
+                                        int force_poll)
 {
         int result = 0;
         unsigned count = atomic_read(&ec->event_count);
         acpi_ec_write_cmd(ec, command);
 
         for (; wdata_len > 0; --wdata_len) {
-                result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count);
+                result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count, force_poll);
                 if (result) {
                         printk(KERN_ERR PREFIX
                                "write_cmd timeout, command = %d\n", command);
@@ -191,7 +193,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
         }
 
         if (!rdata_len) {
-                result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count);
+                result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count, force_poll);
                 if (result) {
                         printk(KERN_ERR PREFIX
                                "finish-write timeout, command = %d\n", command);
@@ -202,7 +204,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
         }
 
         for (; rdata_len > 0; --rdata_len) {
-                result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, count);
+                result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, count, force_poll);
                 if (result) {
                         printk(KERN_ERR PREFIX "read timeout, command = %d\n",
                                command);
@@ -217,7 +219,8 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
 
 static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
                                const u8 * wdata, unsigned wdata_len,
-                               u8 * rdata, unsigned rdata_len)
+                               u8 * rdata, unsigned rdata_len,
+                               int force_poll)
 {
         int status;
         u32 glk;
@@ -240,7 +243,7 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
         /* Make sure GPE is enabled before doing transaction */
         acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
 
-        status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
+        status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0, 0);
         if (status) {
                 printk(KERN_DEBUG PREFIX
                        "input buffer is not empty, aborting transaction\n");
@@ -249,7 +252,8 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
 
         status = acpi_ec_transaction_unlocked(ec, command,
                                               wdata, wdata_len,
-                                              rdata, rdata_len);
+                                              rdata, rdata_len,
+                                              force_poll);
 
       end:
 
@@ -267,12 +271,12 @@ static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
 int acpi_ec_burst_enable(struct acpi_ec *ec)
 {
         u8 d;
-        return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1);
+        return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0);
 }
 
 int acpi_ec_burst_disable(struct acpi_ec *ec)
 {
-        return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0);
+        return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0);
 }
 
 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
@@ -281,7 +285,7 @@ static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
         u8 d;
 
         result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ,
-                                     &address, 1, &d, 1);
+                                     &address, 1, &d, 1, 0);
         *data = d;
         return result;
 }
@@ -290,7 +294,7 @@ static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
 {
         u8 wdata[2] = { address, data };
         return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
-                                   wdata, 2, NULL, 0);
+                                   wdata, 2, NULL, 0, 0);
 }
 
 /*
@@ -349,13 +353,15 @@ EXPORT_SYMBOL(ec_write);
 
 int ec_transaction(u8 command,
                    const u8 * wdata, unsigned wdata_len,
-                   u8 * rdata, unsigned rdata_len)
+                   u8 * rdata, unsigned rdata_len,
+                   int force_poll)
 {
         if (!first_ec)
                 return -ENODEV;
 
         return acpi_ec_transaction(first_ec, command, wdata,
-                                   wdata_len, rdata, rdata_len);
+                                   wdata_len, rdata, rdata_len,
+                                   force_poll);
 }
 
 EXPORT_SYMBOL(ec_transaction);
@@ -374,7 +380,7 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
          * bit to be cleared (and thus clearing the interrupt source).
          */
 
-        result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1);
+        result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0);
         if (result)
                 return result;
 
@@ -410,6 +416,7 @@ static u32 acpi_ec_gpe_handler(void *data)
         acpi_status status = AE_OK;
         u8 value;
         struct acpi_ec *ec = data;
+
         atomic_inc(&ec->event_count);
 
         if (acpi_ec_mode == EC_INTR) {