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Message-ID: <20151030051458.GD5119@richards-mbp.cn.ibm.com> Date: Fri, 30 Oct 2015 13:14:58 +0800 From: Wei Yang <weiyang@...ux.vnet.ibm.com> To: Bjorn Helgaas <bhelgaas@...gle.com> Cc: Alexander Duyck <aduyck@...antis.com>, linux-pci@...r.kernel.org, Ethan Zhao <ethan.zhao@...cle.com>, Wei Yang <weiyang@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2 5/7] PCI: Wait 1 second between disabling VFs and clearing NumVFs On Thu, Oct 29, 2015 at 05:23:22PM -0500, Bjorn Helgaas wrote: >From: Alexander Duyck <aduyck@...antis.com> > >Per sec 3.3.3.1 of the SR-IOV spec, r1.1, we must allow 1.0s after clearing >VF Enable before reading any field in the SR-IOV Extended Capability. > >Wait 1 second before calling pci_iov_set_numvfs(), which reads >PCI_SRIOV_VF_OFFSET and PCI_SRIOV_VF_STRIDE after it sets PCI_SRIOV_NUM_VF. > >[bhelgaas: split to separate patch for reviewability, add spec reference] >Signed-off-by: Alexander Duyck <aduyck@...antis.com> >Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com> >--- > drivers/pci/iov.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > >diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c >index fada98d..24428d5 100644 >--- a/drivers/pci/iov.c >+++ b/drivers/pci/iov.c >@@ -339,13 +339,13 @@ failed: > iov->ctrl &= ~(PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE); > pci_cfg_access_lock(dev); > pci_write_config_word(dev, iov->pos + PCI_SRIOV_CTRL, iov->ctrl); >- pci_iov_set_numvfs(dev, 0); > ssleep(1); > pci_cfg_access_unlock(dev); > > if (iov->link != dev->devfn) > sysfs_remove_link(&dev->dev.kobj, "dep_link"); > >+ pci_iov_set_numvfs(dev, 0); One small question, any specific reason put it here instead of just after sleep()? > return rc; > } > -- Richard Yang Help you, Help me -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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