linux-kernel - [PATCH 1/6] PCI: acpiphp: do not check for SLOT_ENABLED in enable

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Date:	Tue, 25 Jun 2013 19:22:05 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Yinghai Lu <yinghai@...nel.org>, john.ronciak@...el.com,
	miles.j.penner@...el.com, bruce.w.allan@...el.com,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	x86@...nel.org
Subject: [PATCH 1/6] PCI: acpiphp: do not check for SLOT_ENABLED in enable_device()

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

With Thunderbolt you can chain devices: connect a new devices to plugged
one. In this case the slot is already enabled, but we still want to look
for new devices behind it.

We're going to reuse enable_device() for rescan for new devices on the
enabled slot. Let's push the check up by stack.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/pci/hotplug/acpiphp_glue.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 59df857..b983e29 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -688,9 +688,6 @@ static int __ref enable_device(struct acpiphp_slot *slot)
 	int num, max, pass;
 	LIST_HEAD(add_list);
 
-	if (slot->flags & SLOT_ENABLED)
-		goto err_exit;
-
 	list_for_each_entry(func, &slot->funcs, sibling)
 		acpiphp_bus_add(func);
 
@@ -1242,6 +1239,8 @@ int acpiphp_enable_slot(struct acpiphp_slot *slot)
 		goto err_exit;
 
 	if (get_slot_status(slot) == ACPI_STA_ALL) {
+		if (slot->flags & SLOT_ENABLED)
+			goto err_exit;
 		/* configure all functions */
 		retval = enable_device(slot);
 		if (retval)
-- 
1.8.3.1

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