From: Pali Rohár pali@kernel.org
commit d212dcee27c1f89517181047e5485fcbba4a25c2 upstream.
irq_mask and irq_unmask callbacks need to be properly guarded by raw spin locks as masking/unmasking procedure needs atomic read-modify-write operation on hardware register.
Link: https://lore.kernel.org/r/20210820155020.3000-1-pali@kernel.org Reported-by: Marc Zyngier maz@kernel.org Signed-off-by: Pali Rohár pali@kernel.org Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Acked-by: Marc Zyngier maz@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/host/pci-aardvark.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- a/drivers/pci/host/pci-aardvark.c +++ b/drivers/pci/host/pci-aardvark.c @@ -200,6 +200,7 @@ struct advk_pcie { struct list_head resources; struct irq_domain *irq_domain; struct irq_chip irq_chip; + raw_spinlock_t irq_lock; struct irq_domain *msi_domain; struct irq_domain *msi_inner_domain; struct irq_chip msi_bottom_irq_chip; @@ -638,22 +639,28 @@ static void advk_pcie_irq_mask(struct ir { struct advk_pcie *pcie = d->domain->host_data; irq_hw_number_t hwirq = irqd_to_hwirq(d); + unsigned long flags; u32 mask;
+ raw_spin_lock_irqsave(&pcie->irq_lock, flags); mask = advk_readl(pcie, PCIE_ISR1_MASK_REG); mask |= PCIE_ISR1_INTX_ASSERT(hwirq); advk_writel(pcie, mask, PCIE_ISR1_MASK_REG); + raw_spin_unlock_irqrestore(&pcie->irq_lock, flags); }
static void advk_pcie_irq_unmask(struct irq_data *d) { struct advk_pcie *pcie = d->domain->host_data; irq_hw_number_t hwirq = irqd_to_hwirq(d); + unsigned long flags; u32 mask;
+ raw_spin_lock_irqsave(&pcie->irq_lock, flags); mask = advk_readl(pcie, PCIE_ISR1_MASK_REG); mask &= ~PCIE_ISR1_INTX_ASSERT(hwirq); advk_writel(pcie, mask, PCIE_ISR1_MASK_REG); + raw_spin_unlock_irqrestore(&pcie->irq_lock, flags); }
static int advk_pcie_irq_map(struct irq_domain *h, @@ -736,6 +743,8 @@ static int advk_pcie_init_irq_domain(str struct device_node *pcie_intc_node; struct irq_chip *irq_chip;
+ raw_spin_lock_init(&pcie->irq_lock); + pcie_intc_node = of_get_next_child(node, NULL); if (!pcie_intc_node) { dev_err(dev, "No PCIe Intc node found\n");