linux-kernel - [tip: irq/urgent] PCI/MSI: Clear PCI_MSIX_FLAGS

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Date:   Tue, 14 Dec 2021 12:28:05 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Stefan Roese <sr@...x.de>, Thomas Gleixner <tglx@...utronix.de>,
        linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Michal Simek <michal.simek@...inx.com>,
        Marek Vasut <marex@...x.de>, stable@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org, maz@...nel.org
Subject: [tip: irq/urgent] PCI/MSI: Clear PCI_MSIX_FLAGS_MASKALL on error

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     94185adbfad56815c2c8401e16d81bdb74a79201
Gitweb:        https://git.kernel.org/tip/94185adbfad56815c2c8401e16d81bdb74a79201
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Tue, 14 Dec 2021 12:42:14 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 14 Dec 2021 13:23:32 +01:00

PCI/MSI: Clear PCI_MSIX_FLAGS_MASKALL on error

PCI_MSIX_FLAGS_MASKALL is set in the MSI-X control register at MSI-X
interrupt setup time. It's cleared on success, but the error handling path
only clears the PCI_MSIX_FLAGS_ENABLE bit.

That's incorrect as the reset state of the PCI_MSIX_FLAGS_MASKALL bit is
zero. That can be observed via lspci:

        Capabilities: [b0] MSI-X: Enable- Count=67 Masked+

Clear the bit in the error path to restore the reset state.

Fixes: 438553958ba1 ("PCI/MSI: Enable and mask MSI-X early")
Reported-by: Stefan Roese <sr@...x.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Stefan Roese <sr@...x.de>
Cc: linux-pci@...r.kernel.org
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Michal Simek <michal.simek@...inx.com>
Cc: Marek Vasut <marex@...x.de>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/87tufevoqx.ffs@tglx
---
 drivers/pci/msi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 6748cf9..d84cf30 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -784,7 +784,7 @@ out_free:
 	free_msi_irqs(dev);
 
 out_disable:
-	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
+	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE, 0);
 
 	return ret;
 }