On 05/14/2013 07:50 PM, Yinghai Lu wrote:
> On Tue, May 14, 2013 at 3:26 PM, Alexander Duyck
> <alexander.h.duyck@xxxxxxxxx> wrote:
>> This change is meant to fix a deadlock seen when pci_enable_sriov was
>> called from within a driver's probe routine. The issue was that
>> work_on_cpu calls flush_work which attempts to flush a work queue for a
>> cpu that we are currently working in. In order to avoid the reentrant
>> path we just skip the call to work_on_cpu in the case that the device
>> node matches our current node.
>>
>> Reported-by: Yinghai Lu <yinghai@xxxxxxxxxx>
>> Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
>> ---
>>
>> This patch is meant to address the issue pointed out in an earlier patch
>> sent by Yinghai Lu titled:
>> [PATCH 6/7] PCI: Make sure VF's driver get attached after PF's
> Yes, that help. my v2 patch will not need to device schecdule and
> device_initicall to wait
> first work_on_cpu is done.
>
> Tested-by: Yinghai Lu <yinghai@xxxxxxxxxx>
So what ever happened with this patch? It doesn't look like it was
applied anywhere. Was there some objection to it? If so I can update
and resubmit if necessary.
Thanks,
Alex
>
>> drivers/pci/pci-driver.c | 14 +++++++++-----
>> 1 files changed, 9 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
>> index 79277fb..caeb1c0 100644
>> --- a/drivers/pci/pci-driver.c
>> +++ b/drivers/pci/pci-driver.c
>> @@ -277,12 +277,16 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
>> int error, node;
>> struct drv_dev_and_id ddi = { drv, dev, id };
>>
>> - /* Execute driver initialization on node where the device's
>> - bus is attached to. This way the driver likely allocates
>> - its local memory on the right node without any need to
>> - change it. */
>> + /*
>> + * Execute driver initialization on the node where the device's
>> + * bus is attached. This way the driver likely allocates
>> + * its local memory on the right node without any need to
>> + * change it. If the node is the current node just call
>> + * local_pci_probe and avoid the possibility of reentrant
>> + * calls to work_on_cpu.
>> + */
>> node = dev_to_node(&dev->dev);
>> - if (node >= 0) {
>> + if ((node >= 0) && (node != numa_node_id())) {
>> int cpu;
>>
>> get_online_cpus();
>>
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