linux-kernel - [PATCH v2 6/8] PCI: Do error check on own line to split long if conditions

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Message-Id: <20230827133705.12991-7-ilpo.jarvinen@linux.intel.com>
Date:   Sun, 27 Aug 2023 16:37:03 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Andi Shyti <andi.shyti@...nel.org>,
        Philippe Mathieu-Daudé <philmd@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v2 6/8] PCI: Do error check on own line to split long if conditions

Placing PCI error code check inside if condition usually results in
need to split lines. Combined with additional conditions the if
condition becomes messy.

Convert to the usual error handling pattern with an additional variable
to improve code readability. In addition, reverse the logic in
pci_find_vsec_capability() to get rid of &&.

No functional changes intended.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/pci/pci.c    | 9 ++++++---
 drivers/pci/probe.c  | 6 +++---
 drivers/pci/quirks.c | 6 +++---
 3 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 60230da957e0..e5a58f0fe58d 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 8bac3ce02609..0717ff62e54f 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 321156ca273d..863b9a64c1fe 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5381,7 +5381,7 @@ 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;
@@ -5427,8 +5427,8 @@ 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) || (status == 0xffffffff))
 			pdev->cfg_size = PCI_CFG_SPACE_SIZE;
 
 		if (pci_find_saved_cap(pdev, PCI_CAP_ID_EXP))
-- 
2.30.2