[PATCH 5.15.y] PCI: rcar-host: Convert struct rcar_msi mask_lock into raw spinlock

[Sasha Levin <sashal@kernel.org>]

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.org
[ 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)
-- 
2.51.0