linux-kernel - [patch V2 13/19] PCI/MSI: Simplify msi_verify

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Message-ID: <20210729222542.992849326@linutronix.de>
Date:   Thu, 29 Jul 2021 23:51:52 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Kevin Tian <kevin.tian@...el.com>,
        Marc Zyngier <maz@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        x86@...nel.org, linux-s390@...r.kernel.org,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: [patch V2 13/19] PCI/MSI: Simplify msi_verify_entries()

From: Thomas Gleixner <tglx@...utronix.de>

No point in looping over all entries when 64bit addressing mode is enabled
for nothing.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Marc Zyngier <maz@...nel.org>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/pci/msi.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -613,8 +613,11 @@ static int msi_verify_entries(struct pci
 {
 	struct msi_desc *entry;
 
+	if (!dev->no_64bit_msi)
+		return 0;
+
 	for_each_pci_msi_entry(entry, dev) {
-		if (entry->msg.address_hi && dev->no_64bit_msi) {
+		if (entry->msg.address_hi) {
 			pci_err(dev, "arch assigned 64-bit MSI address %#x%08x but device only supports 32 bits\n",
 				entry->msg.address_hi, entry->msg.address_lo);
 			return -EIO;