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@linutronix.de AuthorDate: Tue, 14 Dec 2021 12:42:14 +01:00 Committer: Thomas Gleixner tglx@linutronix.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@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 --- 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; }