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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-09-13 15:16:33 -0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-09-13 16:08:31 -0700 |
| commit | 1a4b1a41b8a3d5256019854e851beed063b34344 (patch) | |
| tree | fa62183e093cf032c74cac8149fb69a49b07b7e0 | |
| parent | 2f4d3218e95d48de2951dcf2bea619ea49ef93de (diff) | |
| download | linux-1a4b1a41b8a3d5256019854e851beed063b34344.tar.bz2 | |
pci: Don't crash when reading mpss from root complex
In pcie_find_smpss(), we have the following statement:
if (dev->is_hotplug_bridge && (!list_is_singular(&dev->bus->devices) ||
dev->bus->self->pcie_type != PCI_EXP_TYPE_ROOT_PORT))
The problem is that at least on my machine, this gets called for the
root complex (virtual P2P bridge), and dev->bus->self is NULL since
the parent bus for this is not itself anchor to a PCI device.
This adds the necessary NULL check.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Jon Mason <mason@myri.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/pci/probe.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index b1187ff31d89..f3f94a5c068f 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1351,7 +1351,8 @@ static int pcie_find_smpss(struct pci_dev *dev, void *data) * will occur as normal. */ if (dev->is_hotplug_bridge && (!list_is_singular(&dev->bus->devices) || - dev->bus->self->pcie_type != PCI_EXP_TYPE_ROOT_PORT)) + (dev->bus->self && + dev->bus->self->pcie_type != PCI_EXP_TYPE_ROOT_PORT))) *smpss = 0; if (*smpss > dev->pcie_mpss) |