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| author | Lukas Wunner <lukas@wunner.de> | 2016-05-02 21:48:25 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-05-02 21:48:25 +0300 |
| commit | 1e398eae8407abdc02cde8a449b14d17ed193d56 (patch) | |
| tree | 58726e551ae0412004dbaeff0ac85eeb06b3e8da /drivers/pci/bus.c | |
| parent | 67e658794ca191b3221b143f2a1c10d002c40bc8 (diff) | |
| download | linux-1e398eae8407abdc02cde8a449b14d17ed193d56.tar.xz | |
PCI: Fix BUG on device attach failure
Previously when pci_bus_add_device() called device_attach() and it returned
a negative value, we emitted a WARN but carried on.
Commit ab1a187bba5c ("PCI: Check device_attach() return value always"),
introduced in Linux 4.6-rc1, changed this to unwind all steps preceding
device_attach() and to not set dev->is_added = 1.
The latter leads to a BUG if pci_bus_add_device() was called from
pci_bus_add_devices(). Fix by not recursing to a child bus if
device_attach() failed for the bridge leading to it.
This can be triggered by plugging in a PCI device (e.g. Thunderbolt) while
the system is asleep. The system locks up when woken because
device_attach() returns -EPROBE_DEFER.
Fixes: ab1a187bba5c ("PCI: Check device_attach() return value always")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/pci/bus.c')
| -rw-r--r-- | drivers/pci/bus.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 6c9f5467bc5f..23a39fdc311e 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -324,7 +324,9 @@ void pci_bus_add_devices(const struct pci_bus *bus) } list_for_each_entry(dev, &bus->devices, bus_list) { - BUG_ON(!dev->is_added); + /* Skip if device attach failed */ + if (!dev->is_added) + continue; child = dev->subordinate; if (child) pci_bus_add_devices(child); |