This is a note to let you know that I've just added the patch titled
PCI: Check P2P bridge for invalid secondary/subordinate range
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-check-p2p-bridge-for-invalid-secondary-subordinate-range.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 1965f66e7db08d1ebccd24a59043eba826cc1ce8 Mon Sep 17 00:00:00 2001
From: Yinghai Lu <[email protected]>
Date: Mon, 10 Sep 2012 17:19:33 -0700
Subject: PCI: Check P2P bridge for invalid secondary/subordinate range
From: Yinghai Lu <[email protected]>
commit 1965f66e7db08d1ebccd24a59043eba826cc1ce8 upstream.
For bridges with "secondary > subordinate", i.e., invalid bus number
apertures, we don't enumerate anything behind the bridge unless the
user specified "pci=assign-busses".
This patch makes us automatically try to reassign the downstream bus
numbers in this case (just for that bridge, not for all bridges as
"pci=assign-busses" does).
We don't discover all the devices on the Intel DP43BF motherboard
without this change (or "pci=assign-busses") because its BIOS configures
a bridge as:
pci 0000:00:1e.0: PCI bridge to [bus 20-08] (subtractive decode)
[bhelgaas: changelog, change message to dev_info]
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=18412
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=625754
Reported-by: Brian C. Huffman <[email protected]>
Reported-by: VL <[email protected]>
Tested-by: VL <[email protected]>
Signed-off-by: Yinghai Lu <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
---
drivers/pci/probe.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -749,8 +749,10 @@ int __devinit pci_scan_bridge(struct pci
/* Check if setup is sensible at all */
if (!pass &&
- (primary != bus->number || secondary <= bus->number)) {
- dev_dbg(&dev->dev, "bus configuration invalid,
reconfiguring\n");
+ (primary != bus->number || secondary <= bus->number ||
+ secondary > subordinate)) {
+ dev_info(&dev->dev, "bridge configuration invalid ([bus
%02x-%02x]), reconfiguring\n",
+ secondary, subordinate);
broken = 1;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/pci-check-p2p-bridge-for-invalid-secondary-subordinate-range.patch
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