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authorAlexander Duyck <alexander.h.duyck@intel.com>2013-11-18 18:59:59 +0100
committerBjorn Helgaas <bhelgaas@google.com>2013-11-25 22:34:45 +0100
commit12c3156f10c5d8c5f1fb3f0bbdb8c1ddb1d1f65c (patch)
tree8436ef47131021f2ac50116d87f7931428e6292c /kernel/workqueue.c
parentLinux 3.13-rc1 (diff)
downloadlinux-12c3156f10c5d8c5f1fb3f0bbdb8c1ddb1d1f65c.tar.xz
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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/workqueue.c')
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