linux-kernel - [PATCH v5 03/10] pci: drop some duplicate code

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Message-ID: <1427641227-7574-4-git-send-email-mst@redhat.com>
Date:	Sun, 29 Mar 2015 17:04:07 +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>
Subject: [PATCH v5 03/10] pci: drop some duplicate code

pci_msi_setup_pci_dev and pci_msi_off share a lot of code.
This used to be justified since pci_msi_setup_pci_dev
wasn't compiled in when CONFIG_PCI_MSI is off.
Now that it is, let's reuse code.

Since pci_msi_off is used by early quirks, doing this requires calling
pci_msi_setup_pci_dev early after device allocation, so move the call to
pci_setup_device.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/pci/pci.c   | 23 ++++-------------------
 drivers/pci/probe.c | 31 +++++++++++++++----------------
 2 files changed, 19 insertions(+), 35 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 81f06e8..fcee8ea 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3106,26 +3106,11 @@ EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx);
  */
 void pci_msi_off(struct pci_dev *dev)
 {
-	int pos;
-	u16 control;
+	if (dev->msi_cap)
+		pci_msi_set_enable(dev, 0);
 
-	/*
-	 * This looks like it could go in msi.c, but we need it even when
-	 * CONFIG_PCI_MSI=n.  For the same reason, we can't use
-	 * dev->msi_cap or dev->msix_cap here.
-	 */
-	pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
-	if (pos) {
-		pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
-		control &= ~PCI_MSI_FLAGS_ENABLE;
-		pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
-	}
-	pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
-	if (pos) {
-		pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
-		control &= ~PCI_MSIX_FLAGS_ENABLE;
-		pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
-	}
+	if (dev->msix_cap)
+		pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
 }
 EXPORT_SYMBOL_GPL(pci_msi_off);
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 50dd934..120772c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1084,6 +1084,18 @@ int pci_cfg_space_size(struct pci_dev *dev)
 
 #define LEGACY_IO_RESOURCE	(IORESOURCE_IO | IORESOURCE_PCI_FIXED)
 
+static void pci_msi_setup_pci_dev(struct pci_dev *dev)
+{
+	dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
+	dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
+
+	/* Disable the msi hardware to avoid screaming interrupts
+	 * during boot.  This is the power on reset default so
+	 * usually this should be a noop.
+	 */
+	pci_msi_off(dev);
+}
+
 /**
  * pci_setup_device - fill in class and map information of a device
  * @dev: the device structure to fill
@@ -1139,6 +1151,9 @@ int pci_setup_device(struct pci_dev *dev)
 	/* "Unknown power state" */
 	dev->current_state = PCI_UNKNOWN;
 
+	/* MSI/MSI-X setup has to be done early since it's used by quirks. */
+	pci_msi_setup_pci_dev(dev);
+
 	/* Early fixups, before probing the BARs */
 	pci_fixup_device(pci_fixup_early, dev);
 	/* device class may be changed after fixup */
@@ -1483,26 +1498,10 @@ 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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