Messages in this thread | | | Date | Tue, 10 Nov 2020 15:21:34 -0600 | From | Bjorn Helgaas <> | Subject | Re: [PATCH] PCI: altera-msi: Remove irq handler and data in one go |
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[+cc Nicolas, Jingoo, Gustavo, Toan]
On Sun, Nov 08, 2020 at 08:11:40PM +0100, Martin Kaiser wrote: > Replace the two separate calls for removing the irq handler and data with a > single irq_set_chained_handler_and_data() call.
This is similar to these:
36f024ed8fc9 ("PCI/MSI: pci-xgene-msi: Consolidate chained IRQ handler install/remove") 5168a73ce32d ("PCI/keystone: Consolidate chained IRQ handler install/remove") 2cf5a03cb29d ("PCI/keystone: Fix race in installing chained IRQ handler")
and it seems potentially important that this removes the IRQ handler and data *atomically*, i.e., both are done while holding irq_get_desc_buslock().
So I would use this:
PCI: altera-msi: Fix race in installing chained IRQ handler
Fix a race where a pending interrupt could be received and the handler called before the handler's data has been setup by converting to irq_set_chained_handler_and_data().
See also 2cf5a03cb29d ("PCI/keystone: Fix race in installing chained IRQ handler").
to make it clear that this is actually a bug fix, not just a cleanup.
Looks like this should also be done in dw_pcie_free_msi() and xgene_msi_hwirq_alloc() at the same time?
> Signed-off-by: Martin Kaiser <martin@kaiser.cx> > --- > drivers/pci/controller/pcie-altera-msi.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/pci/controller/pcie-altera-msi.c b/drivers/pci/controller/pcie-altera-msi.c > index e1636f7714ca..42691dd8ebef 100644 > --- a/drivers/pci/controller/pcie-altera-msi.c > +++ b/drivers/pci/controller/pcie-altera-msi.c > @@ -204,8 +204,7 @@ static int altera_msi_remove(struct platform_device *pdev) > struct altera_msi *msi = platform_get_drvdata(pdev); > > msi_writel(msi, 0, MSI_INTMASK); > - irq_set_chained_handler(msi->irq, NULL); > - irq_set_handler_data(msi->irq, NULL); > + irq_set_chained_handler_and_data(msi->irq, NULL, NULL); > > altera_free_domains(msi); > > -- > 2.20.1 >
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