From 0701c53e460ea64daf0ee789d0b08fef57800016 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 13 Oct 2015 19:14:45 +0100 Subject: [PATCH] genirq/msi: Do not use pci_msi_[un]mask_irq as default methods When we create a generic MSI domain, that MSI_FLAG_USE_DEF_CHIP_OPS is set, and that any of .mask or .unmask are NULL in the irq_chip structure, we set them to pci_msi_[un]mask_irq. This is a bad idea for at least two reasons: - PCI_MSI might not be selected, kernel fails to build (yes, this is legitimate, at least on arm64!) - This may not be a PCI/MSI domain at all (platform MSI, for example) Either way, this looks wrong. Move the overriding of mask/unmask to the PCI counterpart, and panic is any of these two methods is not set in the core code (they really should be present). Signed-off-by: Marc Zyngier Cc: Jiang Liu Cc: Bjorn Helgaas Link: http://lkml.kernel.org/r/1444760085-27857-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner --- drivers/pci/msi.c | 4 ++++ kernel/irq/msi.c | 6 +----- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index d4497141d083..4a7da3c3e035 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1243,6 +1243,10 @@ static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info) BUG_ON(!chip); if (!chip->irq_write_msi_msg) chip->irq_write_msi_msg = pci_msi_domain_write_msg; + if (!chip->irq_mask) + chip->irq_mask = pci_msi_mask_irq; + if (!chip->irq_unmask) + chip->irq_unmask = pci_msi_unmask_irq; } /** diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 7e6512b9dc1f..be9149f62eb8 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -228,11 +228,7 @@ static void msi_domain_update_chip_ops(struct msi_domain_info *info) { struct irq_chip *chip = info->chip; - BUG_ON(!chip); - if (!chip->irq_mask) - chip->irq_mask = pci_msi_mask_irq; - if (!chip->irq_unmask) - chip->irq_unmask = pci_msi_unmask_irq; + BUG_ON(!chip || !chip->irq_mask || !chip->irq_unmask); if (!chip->irq_set_affinity) chip->irq_set_affinity = msi_domain_set_affinity; } -- 2.20.1