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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-09-13 18:16:33 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2011-09-13 23:08:31 (GMT)
commit1a4b1a41b8a3d5256019854e851beed063b34344 (patch)
treefa62183e093cf032c74cac8149fb69a49b07b7e0
parent2f4d3218e95d48de2951dcf2bea619ea49ef93de (diff)
downloadlinux-1a4b1a41b8a3d5256019854e851beed063b34344.tar.xz
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.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index b1187ff..f3f94a5 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)