From: Yinghai Lu <yinghai@kernel.org>
To: Bjorn Helgaas <bhelgaas@google.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Tony Luck <tony.luck@intel.com>,
David Miller <davem@davemloft.net>, x86 <x86@kernel.org>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject: [PATCH -v12 08/15] PCI: Strict checking of valid range for bridge
Date: Tue, 26 Jun 2012 11:54:02 -0700 [thread overview]
Message-ID: <1340736849-14875-9-git-send-email-yinghai@kernel.org> (raw)
In-Reply-To: <1340736849-14875-1-git-send-email-yinghai@kernel.org>
Children bridges busn range should be allocated from parent bus range.
So we could avoid overlapping between sibling bridges on same bus.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/probe.c | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 1cae8fe..98a9911 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -759,6 +759,28 @@ static int __devinit pci_bridge_probe_busn_res(struct pci_bus *bus,
return ret;
}
+static int __devinit pci_bridge_check_busn_broken(struct pci_bus *bus,
+ struct pci_dev *dev,
+ int secondary, int subordinate)
+{
+ int ret;
+ struct resource busn_res;
+
+ memset(&busn_res, 0, sizeof(struct resource));
+ dev_printk(KERN_DEBUG, &dev->dev,
+ "check if busn %02x-%02x is in busn_res: %pR\n",
+ secondary, subordinate, &bus->busn_res);
+ ret = allocate_resource(&bus->busn_res, &busn_res,
+ (subordinate - secondary + 1),
+ secondary, subordinate,
+ 1, NULL, NULL);
+ if (ret)
+ return 1;
+
+ release_resource(&busn_res);
+
+ return 0;
+}
/*
* If it's a bridge, configure it and scan the bus behind it.
* For CardBus bridges, we don't scan behind as the devices will
@@ -797,6 +819,11 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
(primary != bus->number || secondary <= bus->number))
broken = 1;
+ /* more strict checking */
+ if (!pass && !broken && !dev->subordinate)
+ broken = pci_bridge_check_busn_broken(bus, dev,
+ secondary, subordinate);
+
if (broken)
dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
--
1.7.7
next prev parent reply other threads:[~2012-06-26 18:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-26 18:53 [PATCH -v12 00/15] PCI: allocate pci bus num range for unassigned bridge busn Yinghai Lu
2012-06-26 18:53 ` [PATCH -v12 01/15] resources: Split out __allocate_resource() Yinghai Lu
2012-06-26 19:01 ` Linus Torvalds
2012-06-26 20:33 ` Yinghai Lu
2012-06-26 20:43 ` Linus Torvalds
2012-06-26 18:53 ` [PATCH -v12 02/15] resources: Add probe_resource() Yinghai Lu
2012-06-26 22:07 ` Yinghai Lu
2012-08-28 16:09 ` Yinghai Lu
2012-08-28 17:05 ` Linus Torvalds
2012-08-29 0:10 ` Linus Torvalds
2012-08-29 10:14 ` Ram Pai
2012-08-29 16:02 ` Yinghai Lu
2012-08-29 15:57 ` Yinghai Lu
2012-08-29 17:36 ` Yinghai Lu
2012-08-31 0:40 ` Bjorn Helgaas
2012-06-26 18:53 ` [PATCH -v12 03/15] resources: Replace registered resource in tree Yinghai Lu
2012-06-26 18:53 ` [PATCH -v12 04/15] PCI: Add pci_bus_extend/shrink_top() Yinghai Lu
2012-06-26 18:53 ` [PATCH -v12 05/15] PCI: Probe safe range that we can use for unassigned bridge Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 06/15] PCI: Add pci_bus_replace_busn_res() Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 07/15] PCI: Allocate bus range instead of use max blindly Yinghai Lu
2012-06-26 18:54 ` Yinghai Lu [this message]
2012-06-26 18:54 ` [PATCH -v12 09/15] PCI: Kill pci_fixup_parent_subordinate_busnr() Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 10/15] PCI: Seperate child bus scanning to two passes overall Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 11/15] pcmcia: Remove workaround for fixing pci parent bus subordinate Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 12/15] PCI: Double checking setting for bus register and bus struct Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 13/15] PCI, pciehp: Remove not needed bus number range checking Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 14/15] PCI: More strict checking of valid range for bridge Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 15/15] PCI: Don't shrink too much for hotplug bridge Yinghai Lu
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