linux-kernel - [PATCH 8/9] x86/pci: Return pci_mmconfig

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Message-Id: <20231121183643.249006-9-helgaas@kernel.org>
Date:   Tue, 21 Nov 2023 12:36:42 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Dan Williams <dan.j.williams@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Yunying Sun <yunying.sun@...el.com>,
        Tomasz Pala <gotar@...anet.pl>,
        Sebastian Manciulea <manciuleas@...tonmail.com>,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 8/9] x86/pci: Return pci_mmconfig_add() failure early

From: Bjorn Helgaas <bhelgaas@...gle.com>

If pci_mmconfig_alloc() fails, return the failure early so it's obvious
that the failure is the exception, and the success is the normal case.  No
functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 arch/x86/pci/mmconfig-shared.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 459e95782bb1..0cc9520666ef 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -102,14 +102,15 @@ struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
 	struct pci_mmcfg_region *new;
 
 	new = pci_mmconfig_alloc(segment, start, end, addr);
-	if (new) {
-		mutex_lock(&pci_mmcfg_lock);
-		list_add_sorted(new);
-		mutex_unlock(&pci_mmcfg_lock);
+	if (!new)
+		return NULL;
 
-		pr_info("ECAM %pR (base %#lx) for domain %04x [bus %02x-%02x]\n",
-			&new->res, (unsigned long)addr, segment, start, end);
-	}
+	mutex_lock(&pci_mmcfg_lock);
+	list_add_sorted(new);
+	mutex_unlock(&pci_mmcfg_lock);
+
+	pr_info("ECAM %pR (base %#lx) for domain %04x [bus %02x-%02x]\n",
+		&new->res, (unsigned long)addr, segment, start, end);
 
 	return new;
 }
-- 
2.34.1