diff options
author | Alexander Duyck <alexander.h.duyck@intel.com> | 2013-11-18 10:59:59 -0700 |
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committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-11-25 14:34:45 -0700 |
commit | 12c3156f10c5d8c5f1fb3f0bbdb8c1ddb1d1f65c (patch) | |
tree | 8436ef47131021f2ac50116d87f7931428e6292c /kernel | |
parent | 6ce4eac1f600b34f2f7f58f9cd8f0503d79e42ae (diff) |
PCI: Avoid unnecessary CPU switch when calling driver .probe() method
If we are already on a CPU local to the device, call the driver .probe()
method directly without using work_on_cpu().
This is a workaround for a lockdep warning in the following scenario:
pci_call_probe
work_on_cpu(cpu, local_pci_probe, ...)
driver .probe
pci_enable_sriov
...
pci_bus_add_device
...
pci_call_probe
work_on_cpu(cpu, local_pci_probe, ...)
It would be better to fix PCI so we don't call VF driver .probe() methods
from inside a PF driver .probe() method, but that's a bigger project.
[bhelgaas: open bugzilla, rework comments & changelog]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=65071
Link: http://lkml.kernel.org/r/CAE9FiQXYQEAZ=0sG6+2OdffBqfLS9MpoN1xviRR9aDbxPxcKxQ@mail.gmail.com
Link: http://lkml.kernel.org/r/20130624195942.40795.27292.stgit@ahduyck-cp1.jf.intel.com
Tested-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions