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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: ACPI Devel Maling List <linux-acpi@vger.kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Linux PCI <linux-pci@vger.kernel.org>,
	Yinghai Lu <yinghai@kernel.org>, Jiang Liu <liuj97@gmail.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH 22/30] ACPI / hotplug / PCI: Do not exectute _PS0 and _PS3 directly
Date: Thu, 18 Jul 2013 01:30:31 +0200	[thread overview]
Message-ID: <2147895.18KNAqILnt@vostro.rjw.lan> (raw)
In-Reply-To: <2366394.4EoP1MXmG2@vostro.rjw.lan>

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The ACPI-based PCI hotplug (acpiphp) core code need not and really
should not execute _PS0 and _PS3 directly for devices it handles.

First of all, it is not necessary to put devices into D3 after
acpi_bus_trim() has walked through them, because
acpi_device_unregister() invoked by it puts each device into D3cold
before returning.  Thus after disable_device() the slot should be
powered down already.

Second, calling _PS0 directly on ACPI device objects may not be
appropriate, because it may require power resources to be set up in
a specific way in advance and that must be taken care of by the ACPI
core.  Thus modify acpiphp_bus_add() to power up the device using
the appropriate interface after it has run acpi_bus_scan() on its
handle.

After that, the functions executing _PS0 and _PS3, power_on_slot()
and power_off_slot(), are not necessary any more, so drop them
and update the code calling them accordingly.  Also drop the
function flags related to device power states, since they aren't
useful any more too.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/pci/hotplug/acpiphp.h      |    7 --
 drivers/pci/hotplug/acpiphp_glue.c |  106 +++----------------------------------
 2 files changed, 10 insertions(+), 103 deletions(-)

Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c
===================================================================
--- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c
+++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c
@@ -303,12 +303,6 @@ static acpi_status register_slot(acpi_ha
 	if (acpi_has_method(handle, "_STA"))
 		newfunc->flags |= FUNC_HAS_STA;
 
-	if (acpi_has_method(handle, "_PS0"))
-		newfunc->flags |= FUNC_HAS_PS0;
-
-	if (acpi_has_method(handle, "_PS3"))
-		newfunc->flags |= FUNC_HAS_PS3;
-
 	if (acpi_has_method(handle, "_DCK"))
 		newfunc->flags |= FUNC_HAS_DCK;
 
@@ -366,7 +360,7 @@ static acpi_status register_slot(acpi_ha
 
 	if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
 				       &val, 60*1000))
-		slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
+		slot->flags |= SLOT_ENABLED;
 
 	if (is_dock_device(handle)) {
 		/* we don't want to call this device's _EJ0
@@ -446,73 +440,6 @@ static void cleanup_bridge(struct acpiph
 	mutex_unlock(&bridge_mutex);
 }
 
-static int power_on_slot(struct acpiphp_slot *slot)
-{
-	acpi_status status;
-	struct acpiphp_func *func;
-	int retval = 0;
-
-	/* if already enabled, just skip */
-	if (slot->flags & SLOT_POWEREDON)
-		goto err_exit;
-
-	list_for_each_entry(func, &slot->funcs, sibling) {
-		if (func->flags & FUNC_HAS_PS0) {
-			dbg("%s: executing _PS0\n", __func__);
-			status = acpi_evaluate_object(func_to_handle(func),
-						      "_PS0", NULL, NULL);
-			if (ACPI_FAILURE(status)) {
-				warn("%s: _PS0 failed\n", __func__);
-				retval = -1;
-				goto err_exit;
-			} else
-				break;
-		}
-	}
-
-	/* TBD: evaluate _STA to check if the slot is enabled */
-
-	slot->flags |= SLOT_POWEREDON;
-
- err_exit:
-	return retval;
-}
-
-
-static int power_off_slot(struct acpiphp_slot *slot)
-{
-	acpi_status status;
-	struct acpiphp_func *func;
-
-	int retval = 0;
-
-	/* if already disabled, just skip */
-	if ((slot->flags & SLOT_POWEREDON) == 0)
-		goto err_exit;
-
-	list_for_each_entry(func, &slot->funcs, sibling) {
-		if (func->flags & FUNC_HAS_PS3) {
-			status = acpi_evaluate_object(func_to_handle(func),
-						      "_PS3", NULL, NULL);
-			if (ACPI_FAILURE(status)) {
-				warn("%s: _PS3 failed\n", __func__);
-				retval = -1;
-				goto err_exit;
-			} else
-				break;
-		}
-	}
-
-	/* TBD: evaluate _STA to check if the slot is disabled */
-
-	slot->flags &= (~SLOT_POWEREDON);
-
- err_exit:
-	return retval;
-}
-
-
-
 /**
  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
  * @bus: bus to start search with
@@ -559,8 +486,13 @@ static void acpiphp_bus_trim(acpi_handle
  */
 static void acpiphp_bus_add(acpi_handle handle)
 {
+	struct acpi_device *adev = NULL;
+
 	acpiphp_bus_trim(handle);
 	acpi_bus_scan(handle);
+	acpi_bus_get_device(handle, &adev);
+	if (adev)
+		acpi_device_set_power(adev, ACPI_STATE_D0);
 }
 
 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
@@ -1095,23 +1027,8 @@ int acpiphp_enable_slot(struct acpiphp_s
 	int retval;
 
 	mutex_lock(&slot->crit_sect);
-
-	/* wake up all functions */
-	retval = power_on_slot(slot);
-	if (retval)
-		goto err_exit;
-
-	if (get_slot_status(slot) == ACPI_STA_ALL) {
-		/* configure all functions */
-		retval = enable_device(slot);
-		if (retval)
-			power_off_slot(slot);
-	} else {
-		dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
-		power_off_slot(slot);
-	}
-
- err_exit:
+	/* configure all functions */
+	retval = enable_device(slot);
 	mutex_unlock(&slot->crit_sect);
 	return retval;
 }
@@ -1132,11 +1049,6 @@ int acpiphp_disable_and_eject_slot(struc
 	if (retval)
 		goto err_exit;
 
-	/* power off all functions */
-	retval = power_off_slot(slot);
-	if (retval)
-		goto err_exit;
-
 	list_for_each_entry(func, &slot->funcs, sibling)
 		if (func->flags & FUNC_HAS_EJ0) {
 			acpi_handle handle = func_to_handle(func);
@@ -1159,7 +1071,7 @@ int acpiphp_disable_and_eject_slot(struc
  */
 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
 {
-	return (slot->flags & SLOT_POWEREDON);
+	return (slot->flags & SLOT_ENABLED);
 }
 
 
Index: linux-pm/drivers/pci/hotplug/acpiphp.h
===================================================================
--- linux-pm.orig/drivers/pci/hotplug/acpiphp.h
+++ linux-pm/drivers/pci/hotplug/acpiphp.h
@@ -162,7 +162,6 @@ struct acpiphp_attention_info
 
 /* slot flags */
 
-#define SLOT_POWEREDON		(0x00000001)
 #define SLOT_ENABLED		(0x00000002)
 #define SLOT_MULTIFUNCTION	(0x00000004)
 
@@ -170,11 +169,7 @@ struct acpiphp_attention_info
 
 #define FUNC_HAS_STA		(0x00000001)
 #define FUNC_HAS_EJ0		(0x00000002)
-#define FUNC_HAS_PS0		(0x00000010)
-#define FUNC_HAS_PS1		(0x00000020)
-#define FUNC_HAS_PS2		(0x00000040)
-#define FUNC_HAS_PS3		(0x00000080)
-#define FUNC_HAS_DCK            (0x00000100)
+#define FUNC_HAS_DCK            (0x00000004)
 
 /* function prototypes */
 

  parent reply	other threads:[~2013-07-17 23:30 UTC|newest]

Thread overview: 135+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-09  0:01 [RFC][PATCH 0/8] ACPI / hotplug / PCI: Consolidation of handling notifications (in progress) Rafael J. Wysocki
2013-07-09  0:14 ` [RFC][PATCH 1/8] ACPI / PCI: Make bus registration and unregistration symmetric Rafael J. Wysocki
2013-07-09  0:16 ` [RFC][PATCH 2/8] ACPI / hotplug / PCI: Consolidate acpiphp_enumerate_slots() Rafael J. Wysocki
2013-07-09  0:17 ` [RFC][PATCH 3/8] ACPI / hotplug / PCI: Always return success after adding a function Rafael J. Wysocki
2013-07-09  0:18 ` [RFC][PATCH 4/8] ACPI / hotplug / PCI: Hotplug context objects for bridges and functions Rafael J. Wysocki
2013-07-09  9:23   ` Mika Westerberg
2013-07-09 23:54     ` [Update][RFC][PATCH " Rafael J. Wysocki
2013-07-09  0:19 ` [RFC][PATCH 5/8] ACPI / hotplug / PCI: Unified notify handler for hotplug events Rafael J. Wysocki
2013-07-09  9:30   ` Mika Westerberg
2013-07-09 23:49     ` Rafael J. Wysocki
2013-07-09  0:20 ` [RFC][PATCH 6/8] ACPI / hotplug / PCI: Drop acpiphp_handle_to_bridge() Rafael J. Wysocki
2013-07-09  9:37   ` Mika Westerberg
2013-07-09 23:46     ` Rafael J. Wysocki
2013-07-09  0:21 ` [RFC][PATCH 7/8] ACPI / hotplug / PCI: Pass hotplug context object to event handlers Rafael J. Wysocki
2013-07-09  0:22 ` [RFC][PATCH 8/8] ACPI / hotplug / PCI: Merge hotplug event handling functions Rafael J. Wysocki
2013-07-11 23:34 ` [RFC][PATCH 0/30] ACPI / hotplug / PCI: Major rework + Thunderbolt workarounds Rafael J. Wysocki
2013-07-11 23:36   ` [RFC][PATCH 1/30] ACPI / PCI: Make bus registration and unregistration symmetric Rafael J. Wysocki
2013-07-11 23:37   ` [RFC][PATCH 2/30] ACPI / hotplug / PCI: Consolidate acpiphp_enumerate_slots() Rafael J. Wysocki
2013-07-11 23:38   ` [RFC][PATCH 3/30] ACPI / hotplug / PCI: Always return success after adding a function Rafael J. Wysocki
2013-07-11 23:39   ` [RFC][PATCH 4/30] ACPI / hotplug / PCI: Hotplug context objects for bridges and functions Rafael J. Wysocki
2013-07-11 23:40   ` [RFC][PATCH 5/30] ACPI / hotplug / PCI: Unified notify handler for hotplug events Rafael J. Wysocki
2013-07-11 23:44   ` [RFC][PATCH 6/30] ACPI / hotplug / PCI: Rework acpiphp_handle_to_bridge() Rafael J. Wysocki
2013-07-11 23:45   ` [RFC][PATCH 7/30] ACPI / hotplug / PCI: Pass hotplug context objects to event handlers Rafael J. Wysocki
2013-07-11 23:47   ` [RFC][PATCH 8/30] ACPI / hotplug / PCI: Merge hotplug event handling functions Rafael J. Wysocki
2013-07-11 23:48   ` [RFC][PATCH 9/30] ACPI / hotplug / PCI: Drop func field from struct acpiphp_bridge Rafael J. Wysocki
2013-07-11 23:49   ` [RFC][PATCH 10/30] ACPI / hotplug / PCI: Refactor slot allocation code in register_slot() Rafael J. Wysocki
2013-07-11 23:50   ` [RFC][PATCH 11/30] ACPI / hotplug / PCI: Register all devices under the given bridge Rafael J. Wysocki
2013-07-12 11:54     ` Mika Westerberg
2013-07-12 13:01       ` Mika Westerberg
2013-07-11 23:51   ` [RFC][PATCH 12/30] ACPI / hotplug / PCI: Drop sun field from struct acpiphp_slot Rafael J. Wysocki
2013-07-11 23:52   ` [RFC][PATCH 13/30] ACPI / hotplug / PCI: Use common slot count variable in register_slot() Rafael J. Wysocki
2013-07-11 23:54   ` [RFC][PATCH 14/30] ACPI / hotplug / PCI: Drop flags field from struct acpiphp_bridge Rafael J. Wysocki
2013-07-11 23:54   ` [RFC][PATCH 15/30] ACPI / hotplug / PCI: Embed function struct into struct acpiphp_context Rafael J. Wysocki
2013-07-11 23:55   ` [RFC][PATCH 16/30] ACPI / hotplug / PCI: Drop handle field from struct acpiphp_func Rafael J. Wysocki
2013-07-11 23:56   ` [RFC][PATCH 17/30] ACPI / hotplug / PCI: Drop handle field from struct acpiphp_bridge Rafael J. Wysocki
2013-07-11 23:56   ` [RFC][PATCH 18/30] ACPI / hotplug / PCI: Store parent in functions and bus in slots Rafael J. Wysocki
2013-07-11 23:57   ` [RFC][PATCH 19/30] ACPI / hotplug / PCI: Rework namespace scanning and trimming routines Rafael J. Wysocki
2013-07-11 23:58   ` [RFC][PATCH 20/30] ACPI / hotplug / PCI: Drop redundant checks from check_hotplug_bridge() Rafael J. Wysocki
2013-07-11 23:59   ` [RFC][PATCH 21/30] ACPI / hotplug / PCI: Consolidate slot disabling and ejecting Rafael J. Wysocki
2013-07-12  0:00   ` [RFC][PATCH 22/30] ACPI / hotplug / PCI: Do not queue up event handling work items in vain Rafael J. Wysocki
2013-07-12  0:01   ` [RFC][PATCH 23/30] ACPI / hotplug / PCI: Do not exectute _PS0 and _PS3 directly Rafael J. Wysocki
2013-07-12 13:05     ` Mika Westerberg
2013-07-12 21:09       ` Rafael J. Wysocki
2013-07-12  0:02   ` [RFC][PATCH 24/30] ACPI / hotplug / PCI: Do not check SLOT_ENABLED in enable_device() Rafael J. Wysocki
2013-07-12  0:03   ` [RFC][PATCH 25/30] ACPI / hotplug / PCI: Allow slots without new devices to be rescanned Rafael J. Wysocki
2013-07-12  0:04   ` [RFC][PATCH 26/30] ACPI / hotplug / PCI: Check for new devices on enabled slots Rafael J. Wysocki
2013-07-12  0:05   ` [RFC][PATCH 27/30] ACPI / hotplug / PCI: Get rid of unused constants in acpiphp.h Rafael J. Wysocki
2013-07-12  0:06   ` [RFC][PATCH 28/30] ACPI / hotplug / PCI: Sanitize acpiphp_get_(latch)|(adapter)_status() Rafael J. Wysocki
2013-07-12  0:07   ` [RFC][PATCH 29/30] ACPI / hotplug / PCI: Redefine enable_device() and disable_device() Rafael J. Wysocki
2013-07-12  0:07   ` [RFC][PATCH 30/30] ACPI / hotplug / PCI: Clean up bridge_mutex usage Rafael J. Wysocki
2013-07-12 13:18   ` [RFC][PATCH 0/30] ACPI / hotplug / PCI: Major rework + Thunderbolt workarounds Mika Westerberg
2013-07-12 21:04     ` Rafael J. Wysocki
2013-07-17 23:05   ` [PATCH " Rafael J. Wysocki
2013-07-17 23:15     ` [PATCH 1/30] ACPI / PCI: Make bus registration and unregistration symmetric Rafael J. Wysocki
2013-07-18  1:00       ` Yinghai Lu
2013-07-17 23:16     ` [PATCH 2/30] ACPI / hotplug / PCI: Consolidate acpiphp_enumerate_slots() Rafael J. Wysocki
2013-07-18  1:40       ` Yinghai Lu
2013-07-18 19:09         ` Rafael J. Wysocki
2013-07-17 23:17     ` [PATCH 3/30] ACPI / hotplug / PCI: Always return success after adding a function Rafael J. Wysocki
2013-07-17 23:17     ` [PATCH 4/30] ACPI / hotplug / PCI: Hotplug context objects for bridges and functions Rafael J. Wysocki
2013-07-18  2:00       ` Yinghai Lu
2013-07-18 19:04         ` Rafael J. Wysocki
2013-07-18 20:06           ` Rafael J. Wysocki
2013-07-17 23:18     ` [PATCH 5/30] ACPI / hotplug / PCI: Unified notify handler for hotplug events Rafael J. Wysocki
2013-07-18  2:07       ` Yinghai Lu
2013-07-18 18:59         ` Rafael J. Wysocki
2013-07-17 23:19     ` [PATCH 6/30] ACPI / hotplug / PCI: Rework acpiphp_handle_to_bridge() Rafael J. Wysocki
2013-07-17 23:19     ` [PATCH 7/30] ACPI / hotplug / PCI: Pass hotplug context objects to event handlers Rafael J. Wysocki
2013-07-17 23:20     ` [PATCH 8/30] ACPI / hotplug / PCI: Merge hotplug event handling functions Rafael J. Wysocki
2013-07-17 23:21     ` [PATCH 9/30] ACPI / hotplug / PCI: Drop func field from struct acpiphp_bridge Rafael J. Wysocki
2013-07-17 23:22     ` [PATCH 10/30] ACPI / hotplug / PCI: Refactor slot allocation code in register_slot() Rafael J. Wysocki
2013-07-17 23:22     ` [PATCH 11/30] ACPI / hotplug / PCI: Register all devices under the given bridge Rafael J. Wysocki
2013-07-17 23:23     ` [PATCH 12/30] ACPI / hotplug / PCI: Drop sun field from struct acpiphp_slot Rafael J. Wysocki
2013-07-17 23:24     ` [PATCH 13/30] ACPI / hotplug / PCI: Drop flags field from struct acpiphp_bridge Rafael J. Wysocki
2013-07-17 23:24     ` [PATCH 14/30] ACPI / hotplug / PCI: Embed function struct into struct acpiphp_context Rafael J. Wysocki
2013-07-17 23:25     ` [PATCH 15/30] ACPI / hotplug / PCI: Drop handle field from struct acpiphp_func Rafael J. Wysocki
2013-07-17 23:26     ` [PATCH 16/30] ACPI / hotplug / PCI: Drop handle field from struct acpiphp_bridge Rafael J. Wysocki
2013-07-17 23:26     ` [PATCH 17/30] ACPI / hotplug / PCI: Store parent in functions and bus in slots Rafael J. Wysocki
2013-07-17 23:27     ` [PATCH 18/30] ACPI / hotplug / PCI: Rework namespace scanning and trimming routines Rafael J. Wysocki
2013-07-17 23:27     ` [PATCH 19/30] ACPI / hotplug / PCI: Drop redundant checks from check_hotplug_bridge() Rafael J. Wysocki
2013-07-17 23:28     ` [PATCH 20/30] ACPI / hotplug / PCI: Consolidate slot disabling and ejecting Rafael J. Wysocki
2013-07-17 23:29     ` [PATCH 21/30] ACPI / hotplug / PCI: Do not queue up event handling work items in vain Rafael J. Wysocki
2013-07-17 23:30     ` Rafael J. Wysocki [this message]
2013-07-17 23:31     ` [PATCH 23/30] ACPI / hotplug / PCI: Do not check SLOT_ENABLED in enable_device() Rafael J. Wysocki
2013-07-17 23:31     ` [PATCH 24/30] ACPI / hotplug / PCI: Allow slots without new devices to be rescanned Rafael J. Wysocki
2013-07-17 23:32     ` [PATCH 25/30] ACPI / hotplug / PCI: Check for new devices on enabled slots Rafael J. Wysocki
2013-09-04 20:36       ` Alex Williamson
2013-09-04 22:54         ` Rafael J. Wysocki
2013-09-04 23:12           ` Alex Williamson
2013-09-04 23:35             ` Rafael J. Wysocki
2013-09-05  3:37               ` Alex Williamson
2013-09-05  4:06                 ` Alex Williamson
2013-09-05 11:54                   ` Rafael J. Wysocki
2013-09-05 13:19                     ` Alex Williamson
2013-09-05 14:21                       ` Alex Williamson
2013-09-05 19:44                         ` Excess dmesg output from ACPIPHP on boot (was: Re: [PATCH 25/30] ACPI / hotplug / PCI: Check for new devices on enabled slots) Rafael J. Wysocki
2013-09-05 21:39                           ` Rafael J. Wysocki
2013-09-05 21:45                             ` Rafael J. Wysocki
2013-09-05 22:17                             ` Alex Williamson
2013-09-05 22:40                               ` Rafael J. Wysocki
2013-09-05 23:08                                 ` Alex Williamson
2013-09-05 23:36                                   ` Rafael J. Wysocki
2013-09-05 23:31                                     ` Alex Williamson
2013-09-05 23:48                                       ` Rafael J. Wysocki
2013-09-06 12:19                                     ` Bjorn Helgaas
2013-09-06 12:40                                       ` Rafael J. Wysocki
2013-09-06 15:34                                       ` Alex Williamson
2013-09-07 22:16                                         ` [PATCH] ACPI / hotplug / PCI: Avoid parent bus rescans on spurious device checks Rafael J. Wysocki
2013-09-09 16:32                                           ` Alex Williamson
2013-09-09 20:02                                             ` Rafael J. Wysocki
2013-09-06 13:42                                     ` [PATCH 0/2] Re: Excess dmesg output from ACPIPHP on boot Rafael J. Wysocki
2013-09-06 13:43                                       ` [PATCH 1/2] ACPI / hotplug / PCI: Avoid doing too much for spurious notifies Rafael J. Wysocki
2013-09-06 15:46                                         ` Yinghai Lu
2013-09-06 23:45                                           ` Rafael J. Wysocki
2013-09-06 13:46                                       ` [PATCH 2/2] ACPI / hotplug / PCI: Use _OST to notify firmware about notify status Rafael J. Wysocki
2013-09-06 15:36                                       ` [PATCH 0/2] Re: Excess dmesg output from ACPIPHP on boot Alex Williamson
2013-09-06 23:46                                         ` Rafael J. Wysocki
2013-09-05  6:17                 ` [PATCH 25/30] ACPI / hotplug / PCI: Check for new devices on enabled slots Lan Tianyu
2013-09-05 11:57                   ` Rafael J. Wysocki
2013-09-05 13:11                     ` Lan Tianyu
2013-09-05 21:43                       ` Rafael J. Wysocki
2013-07-17 23:33     ` [PATCH 26/30] ACPI / hotplug / PCI: Get rid of unused constants in acpiphp.h Rafael J. Wysocki
2013-07-17 23:34     ` [PATCH 27/30] ACPI / hotplug / PCI: Sanitize acpiphp_get_(latch)|(adapter)_status() Rafael J. Wysocki
2013-07-17 23:35     ` [PATCH 28/30] ACPI / hotplug / PCI: Redefine enable_device() and disable_device() Rafael J. Wysocki
2013-07-17 23:35     ` [PATCH 29/30] ACPI / hotplug / PCI: Clean up bridge_mutex usage Rafael J. Wysocki
2013-07-17 23:36     ` [PATCH 30/30] ACPI / hotplug / PCI: Get rid of check_sub_bridges() Rafael J. Wysocki
2013-07-23  6:49     ` [PATCH 0/30] ACPI / hotplug / PCI: Major rework + Thunderbolt workarounds Yinghai Lu
2013-07-23 21:39       ` Rafael J. Wysocki
2013-07-24  2:20         ` Yinghai Lu
2013-07-24 12:22           ` Rafael J. Wysocki
2013-07-24 12:58           ` Rafael J. Wysocki
2013-07-24 16:06             ` Bjorn Helgaas
2013-07-24 20:02               ` Rafael J. Wysocki
2013-07-25 13:25             ` Yinghai Lu
2013-07-25 19:57               ` Rafael J. Wysocki

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