linux-kernel - [PATCH 3.2 73/92] PCI: shpchp: Check bridge's secondary (not primary) bus speed

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Message-ID: <lsq.1402104389.156824668@decadent.org.uk>
Date:	Sat, 07 Jun 2014 02:26:29 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Bjorn Helgaas" <bhelgaas@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	"Marcel Apfelbaum" <marcel.a@...hat.com>
Subject: [PATCH 3.2 73/92] PCI: shpchp: Check bridge's secondary (not
 primary) bus speed

3.2.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Marcel Apfelbaum <marcel.a@...hat.com>

commit 93fa9d32670f5592c8e56abc9928fc194e1e72fc upstream.

When a new device is added below a hotplug bridge, the bridge's secondary
bus speed and the device's bus speed must match.  The shpchp driver
previously checked the bridge's *primary* bus speed, not the secondary bus
speed.

This caused hot-add errors like:

  shpchp 0000:00:03.0: Speed of bus ff and adapter 0 mismatch

Check the secondary bus speed instead.

[bhelgaas: changelog]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=75251
Fixes: 3749c51ac6c1 ("PCI: Make current and maximum bus speeds part of the PCI core")
Signed-off-by: Marcel Apfelbaum <marcel.a@...hat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/pci/hotplug/shpchp_ctrl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/pci/hotplug/shpchp_ctrl.c
+++ b/drivers/pci/hotplug/shpchp_ctrl.c
@@ -285,8 +285,8 @@ static int board_added(struct slot *p_sl
 		return WRONG_BUS_FREQUENCY;
 	}
 
-	bsp = ctrl->pci_dev->bus->cur_bus_speed;
-	msp = ctrl->pci_dev->bus->max_bus_speed;
+	bsp = ctrl->pci_dev->subordinate->cur_bus_speed;
+	msp = ctrl->pci_dev->subordinate->max_bus_speed;
 
 	/* Check if there are other slots or devices on the same bus */
 	if (!list_empty(&ctrl->pci_dev->subordinate->devices))

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