linux-kernel - [PATCH v5 1/2] PCI: Refactor pci_bridge_d3

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Date:   Tue, 30 May 2023 11:39:46 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Mika Westerberg" <mika.westerberg@...ux.intel.com>,
        S-k Shyam-sundar <Shyam-sundar.S-k@....com>,
        Natikar Basavaraj <Basavaraj.Natikar@....com>,
        Deucher Alexander <Alexander.Deucher@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        <linux-pm@...r.kernel.org>, Lukas Wunner <lukas@...ner.de>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v5 1/2] PCI: Refactor pci_bridge_d3_possible()

All of the cases handled by pci_bridge_d3_possible() are specific
to these branches:
```
	case PCI_EXP_TYPE_ROOT_PORT:
	case PCI_EXP_TYPE_UPSTREAM:
	case PCI_EXP_TYPE_DOWNSTREAM:
```
Drop a level of indentation by returning false in the default case
instead.  No intended functional changes.

Acked-by: Rafael J. Wysocki <rafael@...nel.org>
Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
v4->v5:
 * Add tags
v3->v4:
 * New patch
---
 drivers/pci/pci.c | 68 +++++++++++++++++++++++------------------------
 1 file changed, 34 insertions(+), 34 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 5ede93222bc1..d1fa040bcea7 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2978,48 +2978,48 @@ bool pci_bridge_d3_possible(struct pci_dev *bridge)
 	case PCI_EXP_TYPE_ROOT_PORT:
 	case PCI_EXP_TYPE_UPSTREAM:
 	case PCI_EXP_TYPE_DOWNSTREAM:
-		if (pci_bridge_d3_disable)
-			return false;
+		break;
+	default:
+		return false;
+	}
 
-		/*
-		 * Hotplug ports handled by firmware in System Management Mode
-		 * may not be put into D3 by the OS (Thunderbolt on non-Macs).
-		 */
-		if (bridge->is_hotplug_bridge && !pciehp_is_native(bridge))
-			return false;
+	if (pci_bridge_d3_disable)
+		return false;
 
-		if (pci_bridge_d3_force)
-			return true;
+	/*
+	 * Hotplug ports handled by firmware in System Management Mode
+	 * may not be put into D3 by the OS (Thunderbolt on non-Macs).
+	 */
+	if (bridge->is_hotplug_bridge && !pciehp_is_native(bridge))
+		return false;
 
-		/* Even the oldest 2010 Thunderbolt controller supports D3. */
-		if (bridge->is_thunderbolt)
-			return true;
+	if (pci_bridge_d3_force)
+		return true;
 
-		/* Platform might know better if the bridge supports D3 */
-		if (platform_pci_bridge_d3(bridge))
-			return true;
+	/* Even the oldest 2010 Thunderbolt controller supports D3. */
+	if (bridge->is_thunderbolt)
+		return true;
 
-		/*
-		 * Hotplug ports handled natively by the OS were not validated
-		 * by vendors for runtime D3 at least until 2018 because there
-		 * was no OS support.
-		 */
-		if (bridge->is_hotplug_bridge)
-			return false;
+	/* Platform might know better if the bridge supports D3 */
+	if (platform_pci_bridge_d3(bridge))
+		return true;
 
-		if (dmi_check_system(bridge_d3_blacklist))
-			return false;
+	/*
+	 * Hotplug ports handled natively by the OS were not validated
+	 * by vendors for runtime D3 at least until 2018 because there
+	 * was no OS support.
+	 */
+	if (bridge->is_hotplug_bridge)
+		return false;
 
-		/*
-		 * It should be safe to put PCIe ports from 2015 or newer
-		 * to D3.
-		 */
-		if (dmi_get_bios_year() >= 2015)
-			return true;
-		break;
-	}
+	if (dmi_check_system(bridge_d3_blacklist))
+		return false;
 
-	return false;
+	/*
+	 * It should be safe to put PCIe ports from 2015 or newer
+	 * to D3.
+	 */
+	return dmi_get_bios_year() >= 2015;
 }
 
 static int pci_dev_check_d3cold(struct pci_dev *dev, void *data)

base-commit: 7877cb91f1081754a1487c144d85dc0d2e2e7fc4
-- 
2.34.1