This patch enhances debugging with the GPE reference count messages added.
No functional changes.
Signed-off-by: Lv Zheng <lv.zh...@intel.com>
---
drivers/acpi/ec.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 40002ae..14d0c89 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -31,6 +31,7 @@
/* Uncomment next line to get verbose printout */
/* #define DEBUG */
+#define DEBUG_REF 0
#define pr_fmt(fmt) "ACPI : EC: " fmt
#include <linux/kernel.h>
@@ -90,6 +91,13 @@ enum {
#define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */
#define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */
+#define ec_debug_ref(ec, fmt, ...) \
+ do { \
+ if (DEBUG_REF) \
+ pr_debug("%lu: " fmt, ec->reference_count, \
+ ## __VA_ARGS__); \
+ } while (0)
+
/* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param
*/
static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY;
module_param(ec_delay, uint, 0644);
@@ -356,12 +364,14 @@ static void acpi_ec_submit_event(struct acpi_ec *ec)
/* Hold reference for pending event */
if (!acpi_ec_submit_flushable_request(ec, true))
return;
+ ec_debug_ref(ec, "Increase event\n");
if (!test_and_set_bit(EC_FLAGS_EVENT_PENDING, &ec->flags)) {
pr_debug("***** Event query started *****\n");
schedule_work(&ec->work);
return;
}
acpi_ec_complete_request(ec);
+ ec_debug_ref(ec, "Decrease event\n");
}
static void acpi_ec_complete_event(struct acpi_ec *ec)
@@ -371,6 +381,7 @@ static void acpi_ec_complete_event(struct acpi_ec *ec)
pr_debug("***** Event query stopped *****\n");
/* Unhold reference for pending event */
acpi_ec_complete_request(ec);
+ ec_debug_ref(ec, "Decrease event\n");
/* Check if there is another SCI_EVT detected */
acpi_ec_submit_event(ec);
}
@@ -381,12 +392,14 @@ static void acpi_ec_submit_detection(struct acpi_ec *ec)
/* Hold reference for query submission */
if (!acpi_ec_submit_flushable_request(ec, false))
return;
+ ec_debug_ref(ec, "Increase query\n");
if (!test_and_set_bit(EC_FLAGS_EVENT_DETECTED, &ec->flags)) {
pr_debug("***** Event detection blocked *****\n");
acpi_ec_submit_event(ec);
return;
}
acpi_ec_complete_request(ec);
+ ec_debug_ref(ec, "Decrease query\n");
}
static void acpi_ec_complete_detection(struct acpi_ec *ec)
@@ -396,6 +409,7 @@ static void acpi_ec_complete_detection(struct acpi_ec *ec)
pr_debug("***** Event detetion unblocked *****\n");
/* Unhold reference for query submission */
acpi_ec_complete_request(ec);
+ ec_debug_ref(ec, "Decrease query\n");
}
}
@@ -570,6 +584,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
ret = -EINVAL;
goto unlock;
}
+ ec_debug_ref(ec, "Increase command\n");
/* following two actions should be kept atomic */
ec->curr = t;
pr_debug("***** Command(%s) started *****\n",
@@ -585,6 +600,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
ec->curr = NULL;
/* Disable GPE for command processing (IBF=0/OBF=1) */
acpi_ec_complete_request(ec);
+ ec_debug_ref(ec, "Decrease command\n");
unlock:
spin_unlock_irqrestore(&ec->lock, tmp);
return ret;
@@ -746,8 +762,10 @@ static void acpi_ec_start(struct acpi_ec *ec, bool
resuming)
if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) {
pr_debug("+++++ Starting EC +++++\n");
/* Enable GPE for event processing (SCI_EVT=1) */
- if (!resuming)
+ if (!resuming) {
acpi_ec_submit_request(ec);
+ ec_debug_ref(ec, "Increase driver\n");
+ }
pr_info("+++++ EC started +++++\n");
}
spin_unlock_irqrestore(&ec->lock, flags);
@@ -776,8 +794,10 @@ static void acpi_ec_stop(struct acpi_ec *ec, bool
suspending)
wait_event(ec->wait, acpi_ec_stopped(ec));
spin_lock_irqsave(&ec->lock, flags);
/* Disable GPE for event processing (SCI_EVT=1) */
- if (!suspending)
+ if (!suspending) {
acpi_ec_complete_request(ec);
+ ec_debug_ref(ec, "Decrease driver\n");
+ }
clear_bit(EC_FLAGS_STARTED, &ec->flags);
clear_bit(EC_FLAGS_STOPPED, &ec->flags);
pr_info("+++++ EC stopped +++++\n");
--
1.7.10
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