Pull bugzilla-5764 into release branch
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index c036e2a..18b3ea9 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -116,7 +116,7 @@
struct acpi_generic_address command_addr;
struct acpi_generic_address data_addr;
unsigned long global_lock;
- spinlock_t lock;
+ struct semaphore sem;
} poll;
};
@@ -323,7 +323,6 @@
{
acpi_status status = AE_OK;
int result = 0;
- unsigned long flags = 0;
u32 glk = 0;
ACPI_FUNCTION_TRACE("acpi_ec_read");
@@ -339,8 +338,11 @@
return_VALUE(-ENODEV);
}
- spin_lock_irqsave(&ec->poll.lock, flags);
-
+ if (down_interruptible(&ec->poll.sem)) {
+ result = -ERESTARTSYS;
+ goto end_nosem;
+ }
+
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
&ec->common.command_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
@@ -358,8 +360,8 @@
*data, address));
end:
- spin_unlock_irqrestore(&ec->poll.lock, flags);
-
+ up(&ec->poll.sem);
+end_nosem:
if (ec->common.global_lock)
acpi_release_global_lock(glk);
@@ -370,7 +372,6 @@
{
int result = 0;
acpi_status status = AE_OK;
- unsigned long flags = 0;
u32 glk = 0;
ACPI_FUNCTION_TRACE("acpi_ec_write");
@@ -384,8 +385,11 @@
return_VALUE(-ENODEV);
}
- spin_lock_irqsave(&ec->poll.lock, flags);
-
+ if (down_interruptible(&ec->poll.sem)) {
+ result = -ERESTARTSYS;
+ goto end_nosem;
+ }
+
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
&ec->common.command_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
@@ -406,8 +410,8 @@
data, address));
end:
- spin_unlock_irqrestore(&ec->poll.lock, flags);
-
+ up(&ec->poll.sem);
+end_nosem:
if (ec->common.global_lock)
acpi_release_global_lock(glk);
@@ -568,7 +572,6 @@
{
int result = 0;
acpi_status status = AE_OK;
- unsigned long flags = 0;
u32 glk = 0;
ACPI_FUNCTION_TRACE("acpi_ec_query");
@@ -589,8 +592,11 @@
* Note that successful completion of the query causes the ACPI_EC_SCI
* bit to be cleared (and thus clearing the interrupt source).
*/
- spin_lock_irqsave(&ec->poll.lock, flags);
-
+ if (down_interruptible(&ec->poll.sem)) {
+ result = -ERESTARTSYS;
+ goto end_nosem;
+ }
+
acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
&ec->common.command_addr);
result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
@@ -602,8 +608,8 @@
result = -ENODATA;
end:
- spin_unlock_irqrestore(&ec->poll.lock, flags);
-
+ up(&ec->poll.sem);
+end_nosem:
if (ec->common.global_lock)
acpi_release_global_lock(glk);
@@ -680,7 +686,6 @@
{
union acpi_ec *ec = (union acpi_ec *)ec_cxt;
u32 value = 0;
- unsigned long flags = 0;
static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
@@ -691,9 +696,11 @@
if (!ec_cxt)
goto end;
- spin_lock_irqsave(&ec->poll.lock, flags);
+ if (down_interruptible (&ec->poll.sem)) {
+ return_VOID;
+ }
acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
- spin_unlock_irqrestore(&ec->poll.lock, flags);
+ up(&ec->poll.sem);
/* TBD: Implement asynch events!
* NOTE: All we care about are EC-SCI's. Other EC events are
@@ -1003,7 +1010,7 @@
ec->common.handle = device->handle;
ec->common.uid = -1;
- spin_lock_init(&ec->poll.lock);
+ init_MUTEX(&ec->poll.sem);
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
acpi_driver_data(device) = ec;
@@ -1295,7 +1302,7 @@
&ec_ecdt->common.gpe_bit);
if (ACPI_FAILURE(status))
return status;
- spin_lock_init(&ec_ecdt->poll.lock);
+ init_MUTEX(&ec_ecdt->poll.sem);
ec_ecdt->common.global_lock = TRUE;
ec_ecdt->common.handle = handle;
@@ -1411,7 +1418,7 @@
ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
- spin_lock_init(&ec_ecdt->poll.lock);
+ init_MUTEX(&ec_ecdt->poll.sem);
/* use the GL just to be safe */
ec_ecdt->common.global_lock = TRUE;
ec_ecdt->common.uid = ecdt_ptr->uid;