[PATCH 2.6.13-rc6] PCI/libata INTx cleanup

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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 <[email protected]>


Index: linux-2.6.13-rc6/drivers/scsi/sata_sis.c
===================================================================
--- linux-2.6.13-rc6.orig/drivers/scsi/sata_sis.c
+++ linux-2.6.13-rc6/drivers/scsi/sata_sis.c
@@ -186,18 +186,6 @@ static void sis_scr_write (struct ata_po
 		outl(val, ap->ioaddr.scr_addr + (sc_reg * 4));
 }
 
-/* move to PCI layer, integrate w/ MSI stuff */
-static void pci_enable_intx(struct pci_dev *pdev)
-{
-	u16 pci_command;
-
-	pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
-	if (pci_command & PCI_COMMAND_INTX_DISABLE) {
-		pci_command &= ~PCI_COMMAND_INTX_DISABLE;
-		pci_write_config_word(pdev, PCI_COMMAND, pci_command);
-	}
-}
-
 static int sis_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct ata_probe_ent *probe_ent = NULL;
@@ -254,7 +242,7 @@ static int sis_init_one (struct pci_dev 
 	}
 
 	pci_set_master(pdev);
-	pci_enable_intx(pdev);
+	pci_intx(pdev, 1);
 
 	/* FIXME: check ata_device_add return value */
 	ata_device_add(probe_ent);
Index: linux-2.6.13-rc6/drivers/scsi/ahci.c
===================================================================
--- linux-2.6.13-rc6.orig/drivers/scsi/ahci.c
+++ linux-2.6.13-rc6/drivers/scsi/ahci.c
@@ -862,22 +862,6 @@ static int ahci_host_init(struct ata_pro
 	return 0;
 }
 
-/* move to PCI layer, integrate w/ MSI stuff */
-static 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);
-}
-
 static void ahci_print_info(struct ata_probe_ent *probe_ent)
 {
 	struct ahci_host_priv *hpriv = probe_ent->private_data;
Index: linux-2.6.13-rc6/drivers/scsi/ata_piix.c
===================================================================
--- linux-2.6.13-rc6.orig/drivers/scsi/ata_piix.c
+++ linux-2.6.13-rc6/drivers/scsi/ata_piix.c
@@ -548,18 +548,6 @@ static void piix_set_dmamode (struct ata
 	}
 }
 
-/* move to PCI layer, integrate w/ MSI stuff */
-static void pci_enable_intx(struct pci_dev *pdev)
-{
-	u16 pci_command;
-
-	pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
-	if (pci_command & PCI_COMMAND_INTX_DISABLE) {
-		pci_command &= ~PCI_COMMAND_INTX_DISABLE;
-		pci_write_config_word(pdev, PCI_COMMAND, pci_command);
-	}
-}
-
 #define AHCI_PCI_BAR 5
 #define AHCI_GLOBAL_CTL 0x04
 #define AHCI_ENABLE (1 << 31)
@@ -658,7 +646,7 @@ static int piix_init_one (struct pci_dev
 	 * message-signalled interrupts currently).
 	 */
 	if (port_info[0]->host_flags & PIIX_FLAG_CHECKINTR)
-		pci_enable_intx(pdev);
+		pci_intx(pdev, 1);
 
 	if (combined) {
 		port_info[sata_chan] = &piix_port_info[ent->driver_data];
Index: linux-2.6.13-rc6/drivers/pci/msi.c
===================================================================
--- linux-2.6.13-rc6.orig/drivers/pci/msi.c
+++ linux-2.6.13-rc6/drivers/pci/msi.c
@@ -446,10 +446,7 @@ static void enable_msi_mode(struct pci_d
 	}
     	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 */
 	}
 }
 
@@ -468,10 +465,7 @@ static void disable_msi_mode(struct pci_
 	}
     	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 */
 	}
 }
 
Index: linux-2.6.13-rc6/drivers/pci/pci.c
===================================================================
--- linux-2.6.13-rc6.orig/drivers/pci/pci.c
+++ linux-2.6.13-rc6/drivers/pci/pci.c
@@ -793,6 +793,31 @@ 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
@@ -870,6 +895,7 @@ 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);
Index: linux-2.6.13-rc6/include/linux/pci.h
===================================================================
--- linux-2.6.13-rc6.orig/include/linux/pci.h
+++ linux-2.6.13-rc6/include/linux/pci.h
@@ -815,6 +815,7 @@ void pci_set_master(struct pci_dev *dev)
 #define HAVE_PCI_SET_MWI
 int pci_set_mwi(struct pci_dev *dev);
 void pci_clear_mwi(struct pci_dev *dev);
+void pci_intx(struct pci_dev *dev, int enable);
 int pci_set_dma_mask(struct pci_dev *dev, u64 mask);
 int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask);
 void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno);
Index: linux-2.6.13-rc6/drivers/scsi/sata_uli.c
===================================================================
--- linux-2.6.13-rc6.orig/drivers/scsi/sata_uli.c
+++ linux-2.6.13-rc6/drivers/scsi/sata_uli.c
@@ -171,18 +171,6 @@ static void uli_scr_write (struct ata_po
 	uli_scr_cfg_write(ap, sc_reg, val);
 }
 
-/* move to PCI layer, integrate w/ MSI stuff */
-static void pci_enable_intx(struct pci_dev *pdev)
-{
-	u16 pci_command;
-
-	pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
-	if (pci_command & PCI_COMMAND_INTX_DISABLE) {
-		pci_command &= ~PCI_COMMAND_INTX_DISABLE;
-		pci_write_config_word(pdev, PCI_COMMAND, pci_command);
-	}
-}
-
 static int uli_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct ata_probe_ent *probe_ent;
@@ -255,7 +243,7 @@ static int uli_init_one (struct pci_dev 
 	}
 
 	pci_set_master(pdev);
-	pci_enable_intx(pdev);
+	pci_intx(pdev, 1);
 
 	/* FIXME: check ata_device_add return value */
 	ata_device_add(probe_ent);
-
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