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From: Greg KH <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@kernel.org
Cc: Justin Forbes <jmforbes@linuxtx.org>,
	Zwane Mwaikambo <zwane@arm.linux.org.uk>,
	"Theodore Ts'o" <tytso@mit.edu>,
	Randy Dunlap <rdunlap@xenotime.net>,
	Dave Jones <davej@redhat.com>,
	Chuck Wolber <chuckw@quantumlinux.com>,
	Chris Wedgwood <reviews@ml.cw.f00f.org>,
	Michael Krufky <mkrufky@linuxtv.org>,
	Chuck Ebbert <cebbert@redhat.com>,
	Domenico Andreoli <cavokz@gmail.com>, Willy Tarreau <w@1wt.eu>,
	Rodrigo Rubira Branco <rbranco@la.checkpoint.com>,
	Jake Edge <jake@lwn.net>, Eugene Teo <eteo@redhat.com>,
	torvalds@linux-foundation.org, akpm@linux-foundation.org,
	alan@lxorguk.ukuu.org.uk,
	Alexey Starikovskiy <astarikovskiy@suse.de>,
	Len Brown <len.brown@intel.com>,
	"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: [patch 47/57] ACPI: EC: do transaction from interrupt context
Date: Tue, 4 Nov 2008 15:33:16 -0800	[thread overview]
Message-ID: <20081104233316.GV659@suse.de> (raw)
In-Reply-To: <20081104233028.GA659@suse.de>

[-- Attachment #1: acpi-ec-do-transaction-from-interrupt-context.patch --]
[-- Type: text/plain, Size: 16282 bytes --]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Alexey Starikovskiy <astarikovskiy@suse.de>

commit 7c6db4e050601f359081fde418ca6dc4fc2d0011 upstream.

It is easier and faster to do transaction directly from interrupt context
rather than waking control thread.
Also, cleaner GPE storm avoidance is implemented.
References: 	http://bugzilla.kernel.org/show_bug.cgi?id=9998
		http://bugzilla.kernel.org/show_bug.cgi?id=10724
		http://bugzilla.kernel.org/show_bug.cgi?id=10919
		http://bugzilla.kernel.org/show_bug.cgi?id=11309
		http://bugzilla.kernel.org/show_bug.cgi?id=11549

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/acpi/ec.c |  309 ++++++++++++++++++++++++++----------------------------
 1 file changed, 149 insertions(+), 160 deletions(-)

--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1,7 +1,7 @@
 /*
- *  ec.c - ACPI Embedded Controller Driver (v2.0)
+ *  ec.c - ACPI Embedded Controller Driver (v2.1)
  *
- *  Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
+ *  Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de>
  *  Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
@@ -26,7 +26,7 @@
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */
 
-/* Uncomment next line to get verbose print outs*/
+/* Uncomment next line to get verbose printout */
 /* #define DEBUG */
 
 #include <linux/kernel.h>
@@ -38,6 +38,7 @@
 #include <linux/seq_file.h>
 #include <linux/interrupt.h>
 #include <linux/list.h>
+#include <linux/spinlock.h>
 #include <asm/io.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
@@ -65,22 +66,21 @@ enum ec_command {
 	ACPI_EC_COMMAND_QUERY = 0x84,
 };
 
-/* EC events */
-enum ec_event {
-	ACPI_EC_EVENT_OBF_1 = 1,	/* Output buffer full */
-	ACPI_EC_EVENT_IBF_0,		/* Input buffer empty */
-};
-
 #define ACPI_EC_DELAY		500	/* Wait 500ms max. during EC ops */
 #define ACPI_EC_UDELAY_GLK	1000	/* Wait 1ms max. to get global lock */
 #define ACPI_EC_UDELAY		100	/* Wait 100us before polling EC again */
 
+#define ACPI_EC_STORM_THRESHOLD 20	/* number of false interrupts
+					   per one transaction */
+
 enum {
-	EC_FLAGS_WAIT_GPE = 0,		/* Don't check status until GPE arrives */
 	EC_FLAGS_QUERY_PENDING,		/* Query is pending */
-	EC_FLAGS_GPE_MODE,		/* Expect GPE to be sent for status change */
+	EC_FLAGS_GPE_MODE,		/* Expect GPE to be sent
+					 * for status change */
 	EC_FLAGS_NO_GPE,		/* Don't use GPE mode */
-	EC_FLAGS_RESCHEDULE_POLL	/* Re-schedule poll */
+	EC_FLAGS_GPE_STORM,		/* GPE storm detected */
+	EC_FLAGS_HANDLERS_INSTALLED	/* Handlers for GPE and
+					 * OpReg are installed */
 };
 
 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
@@ -95,6 +95,14 @@ struct acpi_ec_query_handler {
 	u8 query_bit;
 };
 
+struct transaction_data {
+	const u8 *wdata;
+	u8 *rdata;
+	unsigned short irq_count;
+	u8 wlen;
+	u8 rlen;
+};
+
 static struct acpi_ec {
 	acpi_handle handle;
 	unsigned long gpe;
@@ -105,9 +113,8 @@ static struct acpi_ec {
 	struct mutex lock;
 	wait_queue_head_t wait;
 	struct list_head list;
-	struct delayed_work work;
-	atomic_t irq_count;
-	u8 handlers_installed;
+	struct transaction_data *t;
+	spinlock_t t_lock;
 } *boot_ec, *first_ec;
 
 /* 
@@ -150,7 +157,7 @@ static inline u8 acpi_ec_read_data(struc
 {
 	u8 x = inb(ec->data_addr);
 	pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
-	return inb(ec->data_addr);
+	return x;
 }
 
 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
@@ -165,68 +172,79 @@ static inline void acpi_ec_write_data(st
 	outb(data, ec->data_addr);
 }
 
-static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
+static int ec_transaction_done(struct acpi_ec *ec)
 {
-	if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags))
-		return 0;
-	if (event == ACPI_EC_EVENT_OBF_1) {
-		if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
-			return 1;
-	} else if (event == ACPI_EC_EVENT_IBF_0) {
-		if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF))
-			return 1;
-	}
-
-	return 0;
+	unsigned long flags;
+	int ret = 0;
+	spin_lock_irqsave(&ec->t_lock, flags);
+	if (!ec->t || (!ec->t->wlen && !ec->t->rlen))
+		ret = 1;
+	spin_unlock_irqrestore(&ec->t_lock, flags);
+	return ret;
 }
 
-static void ec_schedule_ec_poll(struct acpi_ec *ec)
+static void gpe_transaction(struct acpi_ec *ec, u8 status)
 {
-	if (test_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags))
-		schedule_delayed_work(&ec->work,
-				      msecs_to_jiffies(ACPI_EC_DELAY));
+	unsigned long flags;
+	spin_lock_irqsave(&ec->t_lock, flags);
+	if (!ec->t)
+		goto unlock;
+	if (ec->t->wlen > 0) {
+		if ((status & ACPI_EC_FLAG_IBF) == 0) {
+			acpi_ec_write_data(ec, *(ec->t->wdata++));
+			--ec->t->wlen;
+		} else
+			/* false interrupt, state didn't change */
+			++ec->t->irq_count;
+
+	} else if (ec->t->rlen > 0) {
+		if ((status & ACPI_EC_FLAG_OBF) == 1) {
+			*(ec->t->rdata++) = acpi_ec_read_data(ec);
+			--ec->t->rlen;
+		} else
+			/* false interrupt, state didn't change */
+			++ec->t->irq_count;
+	}
+unlock:
+	spin_unlock_irqrestore(&ec->t_lock, flags);
 }
 
-static void ec_switch_to_poll_mode(struct acpi_ec *ec)
+static int acpi_ec_wait(struct acpi_ec *ec)
 {
+	if (wait_event_timeout(ec->wait, ec_transaction_done(ec),
+			       msecs_to_jiffies(ACPI_EC_DELAY)))
+		return 0;
+	/* missing GPEs, switch back to poll mode */
+	if (printk_ratelimit())
+		pr_info(PREFIX "missing confirmations, "
+				"switch off interrupt mode.\n");
 	set_bit(EC_FLAGS_NO_GPE, &ec->flags);
 	clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
-	acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
-	set_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags);
+	return 1;
 }
 
-static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
+static void acpi_ec_gpe_query(void *ec_cxt);
+
+static int ec_check_sci(struct acpi_ec *ec, u8 state)
 {
-	atomic_set(&ec->irq_count, 0);
-	if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) &&
-	    likely(!force_poll)) {
-		if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event),
-				       msecs_to_jiffies(ACPI_EC_DELAY)))
-			return 0;
-		clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
-		if (acpi_ec_check_status(ec, event)) {
-			/* missing GPEs, switch back to poll mode */
-			if (printk_ratelimit())
-				pr_info(PREFIX "missing confirmations, "
-						"switch off interrupt mode.\n");
-			ec_switch_to_poll_mode(ec);
-			ec_schedule_ec_poll(ec);
-			return 0;
-		}
-	} else {
-		unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
-		clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
-		while (time_before(jiffies, delay)) {
-			if (acpi_ec_check_status(ec, event))
-				return 0;
-			msleep(1);
-		}
-		if (acpi_ec_check_status(ec,event))
+	if (state & ACPI_EC_FLAG_SCI) {
+		if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
+			return acpi_os_execute(OSL_EC_BURST_HANDLER,
+				acpi_ec_gpe_query, ec);
+	}
+	return 0;
+}
+
+static int ec_poll(struct acpi_ec *ec)
+{
+	unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
+	msleep(1);
+	while (time_before(jiffies, delay)) {
+		gpe_transaction(ec, acpi_ec_read_status(ec));
+		msleep(1);
+		if (ec_transaction_done(ec))
 			return 0;
 	}
-	pr_err(PREFIX "acpi_ec_wait timeout, status = 0x%2.2x, event = %s\n",
-		acpi_ec_read_status(ec),
-		(event == ACPI_EC_EVENT_OBF_1) ? "\"b0=1\"" : "\"b1=0\"");
 	return -ETIME;
 }
 
@@ -235,45 +253,51 @@ static int acpi_ec_transaction_unlocked(
 					u8 * rdata, unsigned rdata_len,
 					int force_poll)
 {
-	int result = 0;
-	set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
+	unsigned long tmp;
+	struct transaction_data t = {.wdata = wdata, .rdata = rdata,
+				     .wlen = wdata_len, .rlen = rdata_len,
+				     .irq_count = 0};
+	int ret = 0;
 	pr_debug(PREFIX "transaction start\n");
+	/* disable GPE during transaction if storm is detected */
+	if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
+		clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
+		acpi_disable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
+	}
+	/* start transaction */
+	spin_lock_irqsave(&ec->t_lock, tmp);
+	/* following two actions should be kept atomic */
+	ec->t = &t;
 	acpi_ec_write_cmd(ec, command);
-	for (; wdata_len > 0; --wdata_len) {
-		result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
-		if (result) {
-			pr_err(PREFIX
-			       "write_cmd timeout, command = %d\n", command);
-			goto end;
-		}
-		set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
-		acpi_ec_write_data(ec, *(wdata++));
-	}
-
-	if (!rdata_len) {
-		result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
-		if (result) {
-			pr_err(PREFIX
-			       "finish-write timeout, command = %d\n", command);
-			goto end;
-		}
-	} else if (command == ACPI_EC_COMMAND_QUERY)
+	if (command == ACPI_EC_COMMAND_QUERY)
 		clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
-
-	for (; rdata_len > 0; --rdata_len) {
-		result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll);
-		if (result) {
-			pr_err(PREFIX "read timeout, command = %d\n", command);
-			goto end;
-		}
-		/* Don't expect GPE after last read */
-		if (rdata_len > 1)
-			set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
-		*(rdata++) = acpi_ec_read_data(ec);
-	}
-      end:
+	spin_unlock_irqrestore(&ec->t_lock, tmp);
+	/* if we selected poll mode or failed in GPE-mode do a poll loop */
+	if (force_poll ||
+	    !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ||
+	    acpi_ec_wait(ec))
+		ret = ec_poll(ec);
 	pr_debug(PREFIX "transaction end\n");
-	return result;
+	spin_lock_irqsave(&ec->t_lock, tmp);
+	ec->t = NULL;
+	spin_unlock_irqrestore(&ec->t_lock, tmp);
+	if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
+		/* check if we received SCI during transaction */
+		ec_check_sci(ec, acpi_ec_read_status(ec));
+		/* it is safe to enable GPE outside of transaction */
+		acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
+	} else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
+		   t.irq_count > ACPI_EC_STORM_THRESHOLD) {
+		pr_debug(PREFIX "GPE storm detected\n");
+		set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
+	}
+	return ret;
+}
+
+static int ec_check_ibf0(struct acpi_ec *ec)
+{
+	u8 status = acpi_ec_read_status(ec);
+	return (status & ACPI_EC_FLAG_IBF) == 0;
 }
 
 static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
@@ -283,40 +307,34 @@ static int acpi_ec_transaction(struct ac
 {
 	int status;
 	u32 glk;
-
 	if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
 		return -EINVAL;
-
 	if (rdata)
 		memset(rdata, 0, rdata_len);
-
 	mutex_lock(&ec->lock);
 	if (ec->global_lock) {
 		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
 		if (ACPI_FAILURE(status)) {
-			mutex_unlock(&ec->lock);
-			return -ENODEV;
+			status = -ENODEV;
+			goto unlock;
 		}
 	}
-
-	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
-	if (status) {
+	if (!wait_event_timeout(ec->wait, ec_check_ibf0(ec),
+				msecs_to_jiffies(ACPI_EC_DELAY))) {
 		pr_err(PREFIX "input buffer is not empty, "
 				"aborting transaction\n");
+		status = -ETIME;
 		goto end;
 	}
-
 	status = acpi_ec_transaction_unlocked(ec, command,
 					      wdata, wdata_len,
 					      rdata, rdata_len,
 					      force_poll);
-
-      end:
-
+end:
 	if (ec->global_lock)
 		acpi_release_global_lock(glk);
+unlock:
 	mutex_unlock(&ec->lock);
-
 	return status;
 }
 
@@ -332,7 +350,9 @@ int acpi_ec_burst_enable(struct acpi_ec 
 
 int acpi_ec_burst_disable(struct acpi_ec *ec)
 {
-	return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0);
+	return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
+		acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE,
+			NULL, 0, NULL, 0, 0) : 0;
 }
 
 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
@@ -513,46 +533,26 @@ static void acpi_ec_gpe_query(void *ec_c
 
 static u32 acpi_ec_gpe_handler(void *data)
 {
-	acpi_status status = AE_OK;
 	struct acpi_ec *ec = data;
-	u8 state = acpi_ec_read_status(ec);
+	u8 status;
 
 	pr_debug(PREFIX "~~~> interrupt\n");
-	atomic_inc(&ec->irq_count);
-	if (atomic_read(&ec->irq_count) > 5) {
-		pr_err(PREFIX "GPE storm detected, disabling EC GPE\n");
-		ec_switch_to_poll_mode(ec);
-		goto end;
-	}
-	clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
-	if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
+	status = acpi_ec_read_status(ec);
+
+	gpe_transaction(ec, status);
+	if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0)
 		wake_up(&ec->wait);
 
-	if (state & ACPI_EC_FLAG_SCI) {
-		if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
-			status = acpi_os_execute(OSL_EC_BURST_HANDLER,
-				acpi_ec_gpe_query, ec);
-	} else if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
-		   !test_bit(EC_FLAGS_NO_GPE, &ec->flags) &&
-		   in_interrupt()) {
+	ec_check_sci(ec, status);
+	if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) &&
+	    !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) {
 		/* this is non-query, must be confirmation */
 		if (printk_ratelimit())
 			pr_info(PREFIX "non-query interrupt received,"
 				" switching to interrupt mode\n");
 		set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
-		clear_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags);
 	}
-end:
-	ec_schedule_ec_poll(ec);
-	return ACPI_SUCCESS(status) ?
-	    ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
-}
-
-static void do_ec_poll(struct work_struct *work)
-{
-	struct acpi_ec *ec = container_of(work, struct acpi_ec, work.work);
-	atomic_set(&ec->irq_count, 0);
-	(void)acpi_ec_gpe_handler(ec);
+	return ACPI_INTERRUPT_HANDLED;
 }
 
 /* --------------------------------------------------------------------------
@@ -696,8 +696,7 @@ static struct acpi_ec *make_acpi_ec(void
 	mutex_init(&ec->lock);
 	init_waitqueue_head(&ec->wait);
 	INIT_LIST_HEAD(&ec->list);
-	INIT_DELAYED_WORK_DEFERRABLE(&ec->work, do_ec_poll);
-	atomic_set(&ec->irq_count, 0);
+	spin_lock_init(&ec->t_lock);
 	return ec;
 }
 
@@ -736,22 +735,15 @@ ec_parse_device(acpi_handle handle, u32 
 	return AE_CTRL_TERMINATE;
 }
 
-static void ec_poll_stop(struct acpi_ec *ec)
-{
-	clear_bit(EC_FLAGS_RESCHEDULE_POLL, &ec->flags);
-	cancel_delayed_work(&ec->work);
-}
-
 static void ec_remove_handlers(struct acpi_ec *ec)
 {
-	ec_poll_stop(ec);
 	if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
 				ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
 		pr_err(PREFIX "failed to remove space handler\n");
 	if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
 				&acpi_ec_gpe_handler)))
 		pr_err(PREFIX "failed to remove gpe handler\n");
-	ec->handlers_installed = 0;
+	clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
 }
 
 static int acpi_ec_add(struct acpi_device *device)
@@ -846,17 +838,15 @@ ec_parse_io_ports(struct acpi_resource *
 static int ec_install_handlers(struct acpi_ec *ec)
 {
 	acpi_status status;
-	if (ec->handlers_installed)
+	if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
 		return 0;
 	status = acpi_install_gpe_handler(NULL, ec->gpe,
-					  ACPI_GPE_EDGE_TRIGGERED,
-					  &acpi_ec_gpe_handler, ec);
+				  ACPI_GPE_EDGE_TRIGGERED,
+				  &acpi_ec_gpe_handler, ec);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
-
 	acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
 	acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
-
 	status = acpi_install_address_space_handler(ec->handle,
 						    ACPI_ADR_SPACE_EC,
 						    &acpi_ec_space_handler,
@@ -866,7 +856,7 @@ static int ec_install_handlers(struct ac
 		return -ENODEV;
 	}
 
-	ec->handlers_installed = 1;
+	set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
 	return 0;
 }
 
@@ -887,7 +877,6 @@ static int acpi_ec_start(struct acpi_dev
 
 	/* EC is fully operational, allow queries */
 	clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
-	ec_schedule_ec_poll(ec);
 	return ret;
 }
 
@@ -906,7 +895,7 @@ static int acpi_ec_stop(struct acpi_devi
 
 int __init acpi_boot_ec_enable(void)
 {
-	if (!boot_ec || boot_ec->handlers_installed)
+	if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
 		return 0;
 	if (!ec_install_handlers(boot_ec)) {
 		first_ec = boot_ec;

-- 

  parent reply	other threads:[~2008-11-04 23:55 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20081104232144.186593464@mini.kroah.org>
2008-11-04 23:30 ` [patch 00/57] 2.6.27-stable review Greg KH
2008-11-04 23:30   ` [patch 01/57] agp: Fix stolen memory counting on G4X Greg KH
2008-11-04 23:30   ` [patch 02/57] SCSI: sd: Fix handling of NO_SENSE check condition Greg KH
2008-11-04 23:31   ` [patch 03/57] S390: Fix sysdev class file creation Greg KH
2008-11-04 23:31   ` [patch 04/57] sysfs: Fix return values for sysdev_store_{ulong, int} Greg KH
2008-11-04 23:31   ` [patch 05/57] ipmi: add MODULE_ALIAS to load ipmi_devintf with ipmi_si Greg KH
2008-11-04 23:31   ` [patch 06/57] USB: fix crash when URBs are unlinked after the device is gone Greg KH
2008-11-04 23:31   ` [patch 07/57] ALSA: hda - Add reboot notifier Greg KH
2008-11-04 23:31   ` [patch 08/57] kbuild: mkspec - fix build rpm Greg KH
2008-11-04 23:31   ` [patch 09/57] x86: fix /dev/mem mmap breakage when PAT is disabled Greg KH
2008-11-04 23:31   ` [patch 10/57] atl1: fix vlan tag regression Greg KH
2008-11-04 23:31   ` [patch 11/57] libertas: fix buffer overrun Greg KH
2008-11-04 23:31   ` [patch 12/57] Revert "HID: Invert HWHEEL mappings for some Logitech mice" Greg KH
2008-11-04 23:31   ` [patch 13/57] libata: initialize port_task when !CONFIG_ATA_SFF Greg KH
2008-11-04 23:31   ` [patch 14/57] syncookies: fix inclusion of tcp options in syn-ack Greg KH
2008-11-04 23:31   ` [patch 15/57] tcp: Restore ordering of TCP options for the sake of inter-operability Greg KH
2008-11-04 23:31   ` [patch 16/57] tcpv6: fix option space offsets with md5 Greg KH
2008-11-04 23:31   ` [patch 17/57] pkt_sched: sch_generic: Fix oops in sch_teql Greg KH
2008-11-04 23:31   ` [patch 18/57] sparc64: Fix race in arch/sparc64/kernel/trampoline.S Greg KH
2008-11-04 23:31   ` [patch 19/57] math-emu: Fix signalling of underflow and inexact while packing result Greg KH
2008-11-04 23:31   ` [patch 20/57] firewire: fix setting tag and sy in iso transmission Greg KH
2008-11-04 23:31   ` [patch 21/57] firewire: fix ioctl() return code Greg KH
2008-11-04 23:31   ` [patch 22/57] firewire: Survive more than 256 bus resets Greg KH
2008-11-04 23:31   ` [patch 23/57] firewire: fix struct fw_node memory leak Greg KH
2008-11-04 23:31   ` [patch 24/57] firewire: fw-sbp2: delay first login to avoid retries Greg KH
2008-11-04 23:31   ` [patch 25/57] firewire: fw-sbp2: fix races Greg KH
2008-11-04 23:31   ` [patch 26/57] ACPI: Always report a sync event after a lid state change Greg KH
2008-11-04 23:31   ` [patch 27/57] powerpc: fix i2c on PPC linkstation / kurobox machines Greg KH
2008-11-04 23:31   ` [patch 28/57] powerpc: Reserve in bootmem lmb reserved regions that cross NUMA nodes Greg KH
2008-11-04 23:32   ` [patch 29/57] powerpc/numa: Make memory reserve code more robust Greg KH
2008-11-04 23:32   ` [patch 30/57] powerpc: Dont use a 16G page if beyond mem= limits Greg KH
2008-11-04 23:32   ` [patch 31/57] i2c: The i2c mailing list is moving Greg KH
2008-11-04 23:32   ` [patch 32/57] scx200_i2c: Add missing class parameter Greg KH
2008-11-04 23:32   ` [patch 33/57] ALSA: use correct lock in snd_ctl_dev_disconnect() Greg KH
2008-11-04 23:32   ` [patch 34/57] V4L: pvrusb2: Keep MPEG PTSs from drifting away Greg KH
2008-11-04 23:32   ` [patch 35/57] DVB: s5h1411: bugfix: Setting serial or parallel mode could destroy bits Greg KH
2008-11-04 23:32   ` [patch 36/57] DVB: s5h1411: Perform s5h1411 soft reset after tuning Greg KH
2008-11-04 23:32   ` [patch 37/57] DVB: s5h1411: Power down s5h1411 when not in use Greg KH
2008-11-04 23:32   ` [patch 38/57] PCI: fix 64-vbit prefetchable memory resource BARs Greg KH
2008-11-04 23:32   ` [patch 39/57] sched: disable the hrtick for now Greg KH
2008-11-04 23:33   ` [patch 40/57] sched_clock: prevent scd->clock from moving backwards Greg KH
2008-11-04 23:33   ` [patch 41/57] x86: avoid dereferencing beyond stack + THREAD_SIZE Greg KH
2008-11-04 23:33   ` [patch 42/57] rtc-cmos: look for PNP RTC first, then for platform RTC Greg KH
2008-11-04 23:33   ` [patch 43/57] USB: storage: Avoid I/O errors when issuing SCSI ioctls to JMicron USB/ATA bridge Greg KH
2008-11-04 23:33   ` [patch 44/57] x86: register a platform RTC device if PNP doesnt describe it Greg KH
2008-11-04 23:33   ` [patch 45/57] sata_promise: add ATA engine reset to reset ops Greg KH
2008-11-04 23:33   ` [patch 46/57] sata_nv: fix generic, nf2/3 detection regression Greg KH
2008-11-04 23:33   ` Greg KH [this message]
2008-11-04 23:33   ` [patch 48/57] ACPI: EC: Rename some variables Greg KH
2008-11-04 23:33   ` [patch 49/57] ACPI: EC: Check for IBF=0 periodically if not in GPE mode Greg KH
2008-11-04 23:33   ` [patch 50/57] libata: Fix LBA48 on pata_it821x RAID volumes Greg KH
2008-11-04 23:33   ` [patch 51/57] ACPI: Ingore the RESET_REG_SUP bit when using ACPI reset mechanism Greg KH
2008-11-05  0:48     ` Zhao Yakui
2008-11-05  1:02       ` Greg KH
2008-11-04 23:33   ` [patch 52/57] ACPI: Clear WAK_STS on resume Greg KH
2008-11-04 23:33   ` [patch 53/57] Input: atkbd - expand Latitudes force release quirk to other Dells Greg KH
2008-11-04 23:33   ` [patch 54/57] hfsplus: fix Buffer overflow with a corrupted image Greg KH
2008-11-04 23:33   ` [patch 55/57] hfsplus: check read_mapping_page() return value Greg KH
2008-11-04 23:33   ` [patch 56/57] bonding: fix panic when taking bond interface down before removing module Greg KH
2008-11-04 23:33   ` [patch 57/57] file caps: always start with clear bprm->caps_* Greg KH

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