Merge branch 'pci/config-errs'

- Simplify config accessor error checking (Ilpo Järvinen)

* pci/config-errs:
  scsi: ipr: Do PCI error checks on own line
  PCI: xgene: Do PCI error check on own line & keep return value
  PCI: Do error check on own line to split long "if" conditions
  atm: iphase: Do PCI error checks on own line
  sh: pci: Do PCI error check on own line
  alpha: Streamline convoluted PCI error handling

8 files changed, 50 insertions, 38 deletions

diff --git a/arch/alpha/kernel/sys_miata.c b/arch/alpha/kernel/sys_miata.c
index e1bee8f84c58..33b2798de8fc 100644
--- a/arch/alpha/kernel/sys_miata.c
+++ b/arch/alpha/kernel/sys_miata.c
@@ -183,16 +183,17 @@ miata_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
            the 2nd 8259 controller. So we have to check for it first. */
 
 	if((slot == 7) && (PCI_FUNC(dev->devfn) == 3)) {
-		u8 irq=0;
 		struct pci_dev *pdev = pci_get_slot(dev->bus, dev->devfn & ~7);
-		if(pdev == NULL || pci_read_config_byte(pdev, 0x40,&irq) != PCIBIOS_SUCCESSFUL) {
-			pci_dev_put(pdev);
+		u8 irq = 0;
+		int ret;
+
+		if (!pdev)
 			return -1;
-		}
-		else	{
-			pci_dev_put(pdev);
-			return irq;
-		}
+
+		ret = pci_read_config_byte(pdev, 0x40, &irq);
+		pci_dev_put(pdev);
+
+		return ret == PCIBIOS_SUCCESSFUL ? irq : -1;
 	}
 
 	return COMMON_TABLE_LOOKUP;
diff --git a/arch/sh/drivers/pci/common.c b/arch/sh/drivers/pci/common.c
index 2fd2b77e12ce..ab9e791070b4 100644
--- a/arch/sh/drivers/pci/common.c
+++ b/arch/sh/drivers/pci/common.c
@@ -50,20 +50,21 @@ int __init pci_is_66mhz_capable(struct pci_channel *hose,
 				int top_bus, int current_bus)
 {
 	u32 pci_devfn;
-	unsigned short vid;
+	u16 vid;
 	int cap66 = -1;
 	u16 stat;
+	int ret;
 
 	pr_info("PCI: Checking 66MHz capabilities...\n");
 
 	for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
 		if (PCI_FUNC(pci_devfn))
 			continue;
-		if (early_read_config_word(hose, top_bus, current_bus,
-					   pci_devfn, PCI_VENDOR_ID, &vid) !=
-		    PCIBIOS_SUCCESSFUL)
+		ret = early_read_config_word(hose, top_bus, current_bus,
+					     pci_devfn, PCI_VENDOR_ID, &vid);
+		if (ret != PCIBIOS_SUCCESSFUL)
 			continue;
-		if (vid == 0xffff)
+		if (PCI_POSSIBLE_ERROR(vid))
 			continue;
 
 		/* check 66MHz capability */
diff --git a/drivers/atm/iphase.c b/drivers/atm/iphase.c
index 324148686953..9bba8f280a4d 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -2291,19 +2291,21 @@ static int get_esi(struct atm_dev *dev)
 static int reset_sar(struct atm_dev *dev)  
 {  
 	IADEV *iadev;  
-	int i, error = 1;  
+	int i, error;
 	unsigned int pci[64];  
 	  
 	iadev = INPH_IA_DEV(dev);  
-	for(i=0; i<64; i++)  
-	  if ((error = pci_read_config_dword(iadev->pci,  
-				i*4, &pci[i])) != PCIBIOS_SUCCESSFUL)  
-  	      return error;  
+	for (i = 0; i < 64; i++) {
+		error = pci_read_config_dword(iadev->pci, i * 4, &pci[i]);
+		if (error != PCIBIOS_SUCCESSFUL)
+			return error;
+	}
 	writel(0, iadev->reg+IPHASE5575_EXT_RESET);  
-	for(i=0; i<64; i++)  
-	  if ((error = pci_write_config_dword(iadev->pci,  
-					i*4, pci[i])) != PCIBIOS_SUCCESSFUL)  
-	    return error;  
+	for (i = 0; i < 64; i++) {
+		error = pci_write_config_dword(iadev->pci, i * 4, pci[i]);
+		if (error != PCIBIOS_SUCCESSFUL)
+			return error;
+	}
 	udelay(5);  
 	return 0;  
 }  
diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c
index 887b4941ff32..8e457fa450a2 100644
--- a/drivers/pci/controller/pci-xgene.c
+++ b/drivers/pci/controller/pci-xgene.c
@@ -163,10 +163,11 @@ static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
 				    int where, int size, u32 *val)
 {
 	struct xgene_pcie *port = pcie_bus_to_port(bus);
+	int ret;
 
-	if (pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val) !=
-	    PCIBIOS_SUCCESSFUL)
-		return PCIBIOS_DEVICE_NOT_FOUND;
+	ret = pci_generic_config_read32(bus, devfn, where & ~0x3, 4, val);
+	if (ret != PCIBIOS_SUCCESSFUL)
+		return ret;
 
 	/*
 	 * The v1 controller has a bug in its Configuration Request Retry
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 33946ff5c6bd..4540b7d0f3ab 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -732,15 +732,18 @@ u16 pci_find_vsec_capability(struct pci_dev *dev, u16 vendor, int cap)
 {
 	u16 vsec = 0;
 	u32 header;
+	int ret;
 
 	if (vendor != dev->vendor)
 		return 0;
 
 	while ((vsec = pci_find_next_ext_capability(dev, vsec,
 						     PCI_EXT_CAP_ID_VNDR))) {
-		if (pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER,
-					  &header) == PCIBIOS_SUCCESSFUL &&
-		    PCI_VNDR_HEADER_ID(header) == cap)
+		ret = pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER, &header);
+		if (ret != PCIBIOS_SUCCESSFUL)
+			continue;
+
+		if (PCI_VNDR_HEADER_ID(header) == cap)
 			return vsec;
 	}
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 795534589b98..43159965e09e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1652,15 +1652,15 @@ static void pci_set_removable(struct pci_dev *dev)
 static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
 {
 #ifdef CONFIG_PCI_QUIRKS
-	int pos;
+	int pos, ret;
 	u32 header, tmp;
 
 	pci_read_config_dword(dev, PCI_VENDOR_ID, &header);
 
 	for (pos = PCI_CFG_SPACE_SIZE;
 	     pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) {
-		if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL
-		    || header != tmp)
+		ret = pci_read_config_dword(dev, pos, &tmp);
+		if ((ret != PCIBIOS_SUCCESSFUL) || (header != tmp))
 			return false;
 	}
 
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 32b6b5052f2e..9f1f9afda258 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5383,7 +5383,7 @@ int pci_dev_specific_disable_acs_redir(struct pci_dev *dev)
  */
 static void quirk_intel_qat_vf_cap(struct pci_dev *pdev)
 {
-	int pos, i = 0;
+	int pos, i = 0, ret;
 	u8 next_cap;
 	u16 reg16, *cap;
 	struct pci_cap_saved_state *state;
@@ -5429,8 +5429,8 @@ static void quirk_intel_qat_vf_cap(struct pci_dev *pdev)
 		pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
 
 		pdev->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
-		if (pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status) !=
-		    PCIBIOS_SUCCESSFUL || (status == 0xffffffff))
+		ret = pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status);
+		if ((ret != PCIBIOS_SUCCESSFUL) || (PCI_POSSIBLE_ERROR(status)))
 			pdev->cfg_size = PCI_CFG_SPACE_SIZE;
 
 		if (pci_find_saved_cap(pdev, PCI_CAP_ID_EXP))
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 4e13797b2a4a..81e3d464d1f6 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -761,12 +761,14 @@ static void ipr_mask_and_clear_interrupts(struct ipr_ioa_cfg *ioa_cfg,
 static int ipr_save_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
 {
 	int pcix_cmd_reg = pci_find_capability(ioa_cfg->pdev, PCI_CAP_ID_PCIX);
+	int rc;
 
 	if (pcix_cmd_reg == 0)
 		return 0;
 
-	if (pci_read_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
-				 &ioa_cfg->saved_pcix_cmd_reg) != PCIBIOS_SUCCESSFUL) {
+	rc = pci_read_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
+				  &ioa_cfg->saved_pcix_cmd_reg);
+	if (rc != PCIBIOS_SUCCESSFUL) {
 		dev_err(&ioa_cfg->pdev->dev, "Failed to save PCI-X command register\n");
 		return -EIO;
 	}
@@ -785,10 +787,12 @@ static int ipr_save_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
 static int ipr_set_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
 {
 	int pcix_cmd_reg = pci_find_capability(ioa_cfg->pdev, PCI_CAP_ID_PCIX);
+	int rc;
 
 	if (pcix_cmd_reg) {
-		if (pci_write_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
-					  ioa_cfg->saved_pcix_cmd_reg) != PCIBIOS_SUCCESSFUL) {
+		rc = pci_write_config_word(ioa_cfg->pdev, pcix_cmd_reg + PCI_X_CMD,
+					   ioa_cfg->saved_pcix_cmd_reg);
+		if (rc != PCIBIOS_SUCCESSFUL) {
 			dev_err(&ioa_cfg->pdev->dev, "Failed to setup PCI-X command register\n");
 			return -EIO;
 		}