6.1-stable review patch. If anyone has any objections, please let me know.
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From: Marek Vasut marek.vasut+renesas@mailbox.org
commit 26fda92d3b56bf44a02bcb4001c5a5548e0ae8ee upstream.
The tegra_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 tegra_msi_irq_unmask().
Since the &desc->lock descriptor lock is a raw spinlock, and the tegra_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: 2c99e55f7955 ("PCI: tegra: Convert to MSI domains") Reported-by: Geert Uytterhoeven geert+renesas@glider.be Closes: https://patchwork.kernel.org/project/linux-pci/patch/20250909162707.13927-2-... 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 Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20250922150811.88450-1-marek.vasut+renesas@mailbox.... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/controller/pci-tegra.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-)
--- a/drivers/pci/controller/pci-tegra.c +++ b/drivers/pci/controller/pci-tegra.c @@ -14,6 +14,7 @@ */
#include <linux/clk.h> +#include <linux/cleanup.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/export.h> @@ -269,7 +270,7 @@ struct tegra_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; void *virt; dma_addr_t phys; int irq; @@ -1607,14 +1608,13 @@ static void tegra_msi_irq_mask(struct ir struct tegra_msi *msi = irq_data_get_irq_chip_data(d); struct tegra_pcie *pcie = msi_to_pcie(msi); unsigned int index = d->hwirq / 32; - unsigned long flags; u32 value;
- spin_lock_irqsave(&msi->mask_lock, flags); - value = afi_readl(pcie, AFI_MSI_EN_VEC(index)); - value &= ~BIT(d->hwirq % 32); - afi_writel(pcie, value, AFI_MSI_EN_VEC(index)); - spin_unlock_irqrestore(&msi->mask_lock, flags); + scoped_guard(raw_spinlock_irqsave, &msi->mask_lock) { + value = afi_readl(pcie, AFI_MSI_EN_VEC(index)); + value &= ~BIT(d->hwirq % 32); + afi_writel(pcie, value, AFI_MSI_EN_VEC(index)); + } }
static void tegra_msi_irq_unmask(struct irq_data *d) @@ -1622,14 +1622,13 @@ static void tegra_msi_irq_unmask(struct struct tegra_msi *msi = irq_data_get_irq_chip_data(d); struct tegra_pcie *pcie = msi_to_pcie(msi); unsigned int index = d->hwirq / 32; - unsigned long flags; u32 value;
- spin_lock_irqsave(&msi->mask_lock, flags); - value = afi_readl(pcie, AFI_MSI_EN_VEC(index)); - value |= BIT(d->hwirq % 32); - afi_writel(pcie, value, AFI_MSI_EN_VEC(index)); - spin_unlock_irqrestore(&msi->mask_lock, flags); + scoped_guard(raw_spinlock_irqsave, &msi->mask_lock) { + value = afi_readl(pcie, AFI_MSI_EN_VEC(index)); + value |= BIT(d->hwirq % 32); + afi_writel(pcie, value, AFI_MSI_EN_VEC(index)); + } }
static int tegra_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force) @@ -1745,7 +1744,7 @@ static int tegra_pcie_msi_setup(struct t int err;
mutex_init(&msi->map_lock); - spin_lock_init(&msi->mask_lock); + raw_spin_lock_init(&msi->mask_lock);
if (IS_ENABLED(CONFIG_PCI_MSI)) { err = tegra_allocate_domains(msi);