Merge tag 'acpi-extra-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more ACPI updates from Rafael Wysocki:
"Two more fixes in ACPI drivers, one in the ACPI EC driver
(stable-candidate) and one in the ACPI button driver.
Specifics:
- An ACPI EC driver fix from the 4.3 cycle may cause the ACPICA's
method reentrancy limit to be exceeded for a _Qxx method due to a
large number of concurrent EC operations, so prevent that from
happening by moving the EC handling into a separate workqueue with
a limit on the number of concurrently executed work items (Lv
Zheng)
- Fix the cleanup code in the ACPI button driver that forgets to
clear two variables on exit which causes an error to occur on the
next attmpt to load the driver (Benjamin Tissoires)"
* tag 'acpi-extra-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / EC: Work around method reentrancy limit in ACPICA for _Qxx
ACPI / button: remove pointer to old lid_sysfs on unbind
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 148f4e5..31abb0b 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -232,8 +232,10 @@
acpi_device_dir(device) = NULL;
remove_lid_dir:
remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+ acpi_lid_dir = NULL;
remove_button_dir:
remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+ acpi_button_dir = NULL;
goto done;
}
@@ -250,7 +252,9 @@
acpi_lid_dir);
acpi_device_dir(device) = NULL;
remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+ acpi_lid_dir = NULL;
remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+ acpi_button_dir = NULL;
return 0;
}
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 999a109..e7bd57c 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -101,6 +101,7 @@
#define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */
#define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query
* when trying to clear the EC */
+#define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */
enum {
EC_FLAGS_QUERY_PENDING, /* Query is pending */
@@ -121,6 +122,10 @@
module_param(ec_delay, uint, 0644);
MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes");
+static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES;
+module_param(ec_max_queries, uint, 0644);
+MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations");
+
static bool ec_busy_polling __read_mostly;
module_param(ec_busy_polling, bool, 0644);
MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction");
@@ -174,6 +179,7 @@
struct acpi_ec *boot_ec, *first_ec;
EXPORT_SYMBOL(first_ec);
+static struct workqueue_struct *ec_query_wq;
static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */
static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */
@@ -1098,7 +1104,7 @@
* work queue execution.
*/
ec_dbg_evt("Query(0x%02x) scheduled", value);
- if (!schedule_work(&q->work)) {
+ if (!queue_work(ec_query_wq, &q->work)) {
ec_dbg_evt("Query(0x%02x) overlapped", value);
result = -EBUSY;
}
@@ -1660,15 +1666,41 @@
},
};
+static inline int acpi_ec_query_init(void)
+{
+ if (!ec_query_wq) {
+ ec_query_wq = alloc_workqueue("kec_query", 0,
+ ec_max_queries);
+ if (!ec_query_wq)
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static inline void acpi_ec_query_exit(void)
+{
+ if (ec_query_wq) {
+ destroy_workqueue(ec_query_wq);
+ ec_query_wq = NULL;
+ }
+}
+
int __init acpi_ec_init(void)
{
- int result = 0;
+ int result;
+ /* register workqueue for _Qxx evaluations */
+ result = acpi_ec_query_init();
+ if (result)
+ goto err_exit;
/* Now register the driver for the EC */
result = acpi_bus_register_driver(&acpi_ec_driver);
- if (result < 0)
- return -ENODEV;
+ if (result)
+ goto err_exit;
+err_exit:
+ if (result)
+ acpi_ec_query_exit();
return result;
}
@@ -1678,5 +1710,6 @@
{
acpi_bus_unregister_driver(&acpi_ec_driver);
+ acpi_ec_query_exit();
}
#endif /* 0 */