linux-kernel - [PATCH v5 02/10] pci: move pci_msi_init_pci

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Date:	Sun, 29 Mar 2015 17:04:04 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	Fam Zheng <famz@...hat.com>,
	Yinghai Lu <yhlu.kernel.send@...il.com>,
	Yijing Wang <wangyijing@...wei.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH v5 02/10] pci: move pci_msi_init_pci_dev to probe.c

commit d5dea7d95c48d7bc951cee4910a7fd9c0cd26fb0
    "PCI: msi: Disable msi interrupts when we initialize a pci device"
fixes kexec when the booting kernel does not enable msi interupts.

Unfortunately the relevant functionality is in msi.c so it isn't
compiled in when CONFIG_PCI_MSI is off, which means such configurations
would still get interrupt storms.

Fix by moving part of the functionality probe.c, and compiling it
unconditionally.

Cc: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/pci/msi.c   | 12 ------------
 drivers/pci/probe.c | 16 ++++++++++++++++
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 9942f68..f66be86 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1041,18 +1041,6 @@ EXPORT_SYMBOL(pci_msi_enabled);
 void pci_msi_init_pci_dev(struct pci_dev *dev)
 {
 	INIT_LIST_HEAD(&dev->msi_list);
-
-	/* Disable the msi hardware to avoid screaming interrupts
-	 * during boot.  This is the power on reset default so
-	 * usually this should be a noop.
-	 */
-	dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
-	if (dev->msi_cap)
-		pci_msi_set_enable(dev, 0);
-
-	dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
-	if (dev->msix_cap)
-		pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
 }
 
 /**
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8d2f400..50dd934 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1483,10 +1483,26 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
 	return dev;
 }
 
+static void pci_msi_setup_pci_dev(struct pci_dev *dev)
+{
+	/* Disable the msi hardware to avoid screaming interrupts
+	 * during boot.  This is the power on reset default so
+	 * usually this should be a noop.
+	 */
+	dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
+	if (dev->msi_cap)
+		pci_msi_set_enable(dev, 0);
+
+	dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
+	if (dev->msix_cap)
+		pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
+}
+
 static void pci_init_capabilities(struct pci_dev *dev)
 {
 	/* MSI/MSI-X list */
 	pci_msi_init_pci_dev(dev);
+	pci_msi_setup_pci_dev(dev);
 
 	/* Buffers for saving PCIe and PCI-X capabilities */
 	pci_allocate_cap_save_buffers(dev);
-- 
MST

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