linux-kernel - [PATCH v3 1/6] alpha: Streamline convoluted PCI error handling

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Message-Id: <20230911125354.25501-2-ilpo.jarvinen@linux.intel.com>
Date:   Mon, 11 Sep 2023 15:53:49 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Rob Herring <robh@...nel.org>, Bjorn Helgaas <helgaas@...nel.org>,
        linux-pci@...r.kernel.org,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>, linux-alpha@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     3chas3@...il.com, brking@...ibm.com, dalias@...c.org,
        glaubitz@...sik.fu-berlin.de, jejb@...ux.ibm.com, kw@...ux.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-atm-general@...ts.sourceforge.net,
        linux-scsi@...r.kernel.org, linux-sh@...r.kernel.org,
        lpieralisi@...nel.org, martin.petersen@...cle.com,
        netdev@...r.kernel.org, toan@...amperecomputing.com,
        ysato@...rs.sourceforge.jp,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v3 1/6] alpha: Streamline convoluted PCI error handling

miata_map_irq() handles PCI device and read config related errors in a
conditional block that is more complex than necessary.

Streamline the code flow and error handling.

No functional changes intended.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 arch/alpha/kernel/sys_miata.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 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;
-- 
2.30.2