Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 46/71] PCI/MSI: Clear PCI_MSIX_FLAGS_MASKALL on error | Date | Mon, 20 Dec 2021 15:34:35 +0100 |
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From: Thomas Gleixner <tglx@linutronix.de>
commit 94185adbfad56815c2c8401e16d81bdb74a79201 upstream.
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@denx.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Stefan Roese <sr@denx.de> Cc: linux-pci@vger.kernel.org Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Michal Simek <michal.simek@xilinx.com> Cc: Marek Vasut <marex@denx.de> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/87tufevoqx.ffs@tglx Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/pci/msi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -878,7 +878,7 @@ 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; }
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