From a04ce0ffcaf561994ecf382cd3caad75556dc499 Mon Sep 17 00:00:00 2001
From: Brett M Russ <russb@emc.com>
Date: Mon, 15 Aug 2005 15:23:41 -0400
Subject: [PATCH] PCI/libata INTx cleanup

Simple cleanup to eliminate X copies of the pci_enable_intx() function
in libata.  Moved ahci.c's pci_intx() to pci.c and use it throughout
libata and msi.c.

Signed-off-by: Brett Russ <russb@emc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/pci/msi.c | 10 ++--------
 drivers/pci/pci.c | 26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 8 deletions(-)

(limited to 'drivers/pci')

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 532f73b..ee8677b 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -439,10 +439,7 @@ static void enable_msi_mode(struct pci_dev *dev, int pos, int type)
 	}
     	if (pci_find_capability(dev, PCI_CAP_ID_EXP)) {
 		/* PCI Express Endpoint device detected */
-		u16 cmd;
-		pci_read_config_word(dev, PCI_COMMAND, &cmd);
-		cmd |= PCI_COMMAND_INTX_DISABLE;
-		pci_write_config_word(dev, PCI_COMMAND, cmd);
+		pci_intx(dev, 0);  /* disable intx */
 	}
 }
 
@@ -461,10 +458,7 @@ void disable_msi_mode(struct pci_dev *dev, int pos, int type)
 	}
     	if (pci_find_capability(dev, PCI_CAP_ID_EXP)) {
 		/* PCI Express Endpoint device detected */
-		u16 cmd;
-		pci_read_config_word(dev, PCI_COMMAND, &cmd);
-		cmd &= ~PCI_COMMAND_INTX_DISABLE;
-		pci_write_config_word(dev, PCI_COMMAND, cmd);
+		pci_intx(dev, 1);  /* enable intx */
 	}
 }
 
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e179af3..ccff633 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -798,6 +798,31 @@ pci_clear_mwi(struct pci_dev *dev)
 	}
 }
 
+/**
+ * pci_intx - enables/disables PCI INTx for device dev
+ * @dev: the PCI device to operate on
+ * @enable: boolean
+ *
+ * Enables/disables PCI INTx for device dev
+ */
+void
+pci_intx(struct pci_dev *pdev, int enable)
+{
+	u16 pci_command, new;
+
+	pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
+
+	if (enable) {
+		new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
+	} else {
+		new = pci_command | PCI_COMMAND_INTX_DISABLE;
+	}
+
+	if (new != pci_command) {
+		pci_write_config_word(pdev, PCI_COMMAND, pci_command);
+	}
+}
+
 #ifndef HAVE_ARCH_PCI_SET_DMA_MASK
 /*
  * These can be overridden by arch-specific implementations
@@ -875,6 +900,7 @@ EXPORT_SYMBOL(pci_request_region);
 EXPORT_SYMBOL(pci_set_master);
 EXPORT_SYMBOL(pci_set_mwi);
 EXPORT_SYMBOL(pci_clear_mwi);
+EXPORT_SYMBOL_GPL(pci_intx);
 EXPORT_SYMBOL(pci_set_dma_mask);
 EXPORT_SYMBOL(pci_set_consistent_dma_mask);
 EXPORT_SYMBOL(pci_assign_resource);
-- 
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