From: Marc Zyngier <marc.zyngier@arm.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Jiang Liu <jiang.liu@linux.intel.com>,
Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] genirq/msi: Do not use pci_msi_[un]mask_irq as default methods
Date: Tue, 13 Oct 2015 19:14:45 +0100
Message-ID: <1444760085-27857-1-git-send-email-marc.zyngier@arm.com> (raw)
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 <marc.zyngier@arm.com>
---
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 d449714..4a7da3c 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 7e6512b..be9149f 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;
}
--
2.1.4
next reply index
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-13 18:14 Marc Zyngier [this message]
2015-10-14 2:21 ` Jiang Liu
2015-10-15 8:40 ` Thomas Gleixner
2015-10-16 9:53 ` Thomas Gleixner
2015-10-16 12:18 ` [tip:irq/urgent] genirq/msi: Do not use pci_msi_[un] mask_irq " tip-bot for Marc Zyngier
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