From: Thomas Gleixner tglx@linutronix.de
stable inclusion from stable-5.10.60 commit e42fb8e6161e6cbfd74bc28787823a9928752297 bugzilla: 177018 https://gitee.com/openeuler/kernel/issues/I4EAUG
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 361fd37397f77578735907341579397d5bed0a2d upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- 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 79401c52022a..ece8df812eb8 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -663,21 +663,21 @@ 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;