got
[ 29.939191] pci 0000:08:00.0: calling quirk_resource_alignment+0x0/0x1aa
[ 29.951060] BUG: unable to handle kernel NULL pointer dereference at 00000000000003d0
[ 29.959986] IP: [<ffffffff81542551>] pci_find_ext_capability+0x16/0xa9
...
[ 30.229419] Call Trace:
[ 30.233810] [<ffffffff8154080f>] next_ari_fn+0x1b/0x41
[ 30.240390] [<ffffffff815407f4>] ? next_ari_fn+0x0/0x41
[ 30.250327] [<ffffffff815407f4>] ? next_ari_fn+0x0/0x41
[ 30.259708] [<ffffffff81541604>] pci_scan_slot+0xd7/0x11e
[ 30.270569] [<ffffffff81ccb498>] pci_scan_child_bus+0x5c/0x13c
[ 30.281684] [<ffffffff81ccb102>] pci_scan_bridge+0x1ab/0x4e5
[ 30.294216] [<ffffffff81ccaba7>] ? pci_read_bridge_bases+0x16/0x3c6
[ 30.306476] [<ffffffff81ccb523>] pci_scan_child_bus+0xe7/0x13c
[ 30.314494] [<ffffffff81d04504>] pci_acpi_scan_root+0x179/0x1da
[ 30.328273] [<ffffffff81ccd638>] acpi_pci_root_add+0x1bd/0x2bd
[ 30.339462] [<ffffffff8156c2dd>] acpi_device_probe+0x50/0x18a
...
[ 30.594901] RIP [<ffffffff81542551>] pci_find_ext_capability+0x16/0xa9
[ 30.600594] RSP <ffff883ff3d35a10>
[ 30.610297] CR2: 00000000000003d0
[ 30.613716] ---[ end trace 4eaa2a86a8e2da22 ]---
check if dev is null in that function.
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
---
drivers/pci/probe.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/pci/probe.c
===================================================================
--- linux-2.6.orig/drivers/pci/probe.c
+++ linux-2.6/drivers/pci/probe.c
@@ -1234,7 +1234,11 @@ EXPORT_SYMBOL(pci_scan_single_device);
static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn)
{
u16 cap;
- unsigned pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
+ unsigned pos;
+
+ if (!dev)
+ return 0;
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
if (!pos)
return 0;
pci_read_config_word(dev, pos + 4, &cap);
--
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