From: Marek Vasut marek.vasut+renesas@mailbox.org
[ Upstream commit 5ed35b4d490d8735021cce9b715b62a418310864 ]
The rcar_msi_irq_unmask() function may be called from a PCI driver request_threaded_irq() function. This triggers kernel/irq/manage.c __setup_irq() which locks raw spinlock &desc->lock descriptor lock and with that descriptor lock held, calls rcar_msi_irq_unmask().
Since the &desc->lock descriptor lock is a raw spinlock, and the rcar_msi .mask_lock is not a raw spinlock, this setup triggers 'BUG: Invalid wait context' with CONFIG_PROVE_RAW_LOCK_NESTING=y.
Use scoped_guard() to simplify the locking.
Fixes: 83ed8d4fa656 ("PCI: rcar: Convert to MSI domains") Reported-by: Duy Nguyen duy.nguyen.rh@renesas.com Reported-by: Thuan Nguyen thuan.nguyen-hong@banvien.com.vn Signed-off-by: Marek Vasut marek.vasut+renesas@mailbox.org Signed-off-by: Manivannan Sadhasivam mani@kernel.org Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Geert Uytterhoeven geert+renesas@glider.be Acked-by: Marc Zyngier maz@kernel.org Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20250909162707.13927-2-marek.vasut+renesas@mailbox.... [ replaced scoped_guard() with explicit raw_spin_lock_irqsave()/raw_spin_unlock_irqrestore() calls ] Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/pcie-rcar-host.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c index bfb13f358d073..3ceed9866de28 100644 --- a/drivers/pci/controller/pcie-rcar-host.c +++ b/drivers/pci/controller/pcie-rcar-host.c @@ -38,7 +38,7 @@ struct rcar_msi { DECLARE_BITMAP(used, INT_PCI_MSI_NR); struct irq_domain *domain; struct mutex map_lock; - spinlock_t mask_lock; + raw_spinlock_t mask_lock; int irq1; int irq2; }; @@ -559,11 +559,11 @@ static void rcar_msi_irq_mask(struct irq_data *d) unsigned long flags; u32 value;
- spin_lock_irqsave(&msi->mask_lock, flags); + raw_spin_lock_irqsave(&msi->mask_lock, flags); value = rcar_pci_read_reg(pcie, PCIEMSIIER); value &= ~BIT(d->hwirq); rcar_pci_write_reg(pcie, value, PCIEMSIIER); - spin_unlock_irqrestore(&msi->mask_lock, flags); + raw_spin_unlock_irqrestore(&msi->mask_lock, flags); }
static void rcar_msi_irq_unmask(struct irq_data *d) @@ -573,11 +573,11 @@ static void rcar_msi_irq_unmask(struct irq_data *d) unsigned long flags; u32 value;
- spin_lock_irqsave(&msi->mask_lock, flags); + raw_spin_lock_irqsave(&msi->mask_lock, flags); value = rcar_pci_read_reg(pcie, PCIEMSIIER); value |= BIT(d->hwirq); rcar_pci_write_reg(pcie, value, PCIEMSIIER); - spin_unlock_irqrestore(&msi->mask_lock, flags); + raw_spin_unlock_irqrestore(&msi->mask_lock, flags); }
static int rcar_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force) @@ -693,7 +693,7 @@ static int rcar_pcie_enable_msi(struct rcar_pcie_host *host) int err;
mutex_init(&msi->map_lock); - spin_lock_init(&msi->mask_lock); + raw_spin_lock_init(&msi->mask_lock);
err = of_address_to_resource(dev->of_node, 0, &res); if (err)