| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.4 071/214] PCI: shpchp: Check bridges secondary (not primary) bus speed | Date | Wed, 4 Jun 2014 21:17:14 -0700 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Marcel Apfelbaum <marcel.a@redhat.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@redhat.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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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