The following commit has been merged into the irq/core branch of tip:
Commit-ID: 361fd37397f77578735907341579397d5bed0a2d Gitweb: https://git.kernel.org/tip/361fd37397f77578735907341579397d5bed0a2d Author: Thomas Gleixner tglx@linutronix.de AuthorDate: Thu, 29 Jul 2021 23:51:44 +02:00 Committer: Thomas Gleixner tglx@linutronix.de CommitterDate: Tue, 10 Aug 2021 10:59:20 +02:00
PCI/MSI: Do not set invalid bits in MSI mask
msi_mask_irq() takes a mask and a flags argument. The mask argument is used to mask out bits from the cached mask and the flags argument to set bits.
Some places invoke it with a flags argument which sets bits which are not used by the device, i.e. when the device supports up to 8 vectors a full unmask in some places sets the mask to 0xFFFFFF00. While devices probably do not care, it's still bad practice.
Fixes: 7ba1930db02f ("PCI MSI: Unmask MSI if setup failed") Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Marc Zyngier maz@kernel.org Reviewed-by: Marc Zyngier maz@kernel.org Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210729222542.568173099@linutronix.de
--- drivers/pci/msi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 434c704..e27ac6b 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -656,21 +656,21 @@ static int msi_capability_init(struct pci_dev *dev, int nvec, /* Configure MSI capability structure */ ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI); if (ret) { - msi_mask_irq(entry, mask, ~mask); + msi_mask_irq(entry, mask, 0); free_msi_irqs(dev); return ret; }
ret = msi_verify_entries(dev); if (ret) { - msi_mask_irq(entry, mask, ~mask); + msi_mask_irq(entry, mask, 0); free_msi_irqs(dev); return ret; }
ret = populate_msi_sysfs(dev); if (ret) { - msi_mask_irq(entry, mask, ~mask); + msi_mask_irq(entry, mask, 0); free_msi_irqs(dev); return ret; } @@ -962,7 +962,7 @@ static void pci_msi_shutdown(struct pci_dev *dev) /* Return the device with MSI unmasked as initial states */ mask = msi_mask(desc->msi_attrib.multi_cap); /* Keep cached state to be restored */ - __pci_msi_desc_mask_irq(desc, mask, ~mask); + __pci_msi_desc_mask_irq(desc, mask, 0);
/* Restore dev->irq to its default pin-assertion IRQ */ dev->irq = desc->msi_attrib.default_irq;