From 24d68db713d63dfe3660c56b50e887784844baea Mon Sep 17 00:00:00 2001 From: Matt Turner Date: Thu, 28 May 2026 19:05:16 -0400 Subject: [PATCH] alpha: marvel: Fix lock ordering in init_io7_irqs() Move irq_set_chip_and_handler() and irq_set_status_flags() calls outside the io7->irq_lock raw spinlock. These functions take sparse_irq_lock, which is a mutex, and taking a sleeping lock while holding a raw spinlock is invalid. The raw spinlock only needs to protect the hardware CSR accesses. This fixes the following lockdep splat during boot: [ BUG: Invalid wait context ] swapper/0/0 is trying to lock: sparse_irq_lock{....}-{4:4}, at: irq_mark_irq other info that might help us debug this: context-{5:5} 1 lock held by swapper/0/0: #0: &io7->irq_lock{....}-{2:2}, at: init_io7_irqs.constprop.0 Cc: stable@vger.kernel.org Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Matt Turner Reviewed-by: Magnus Lindholm Link: https://lore.kernel.org/r/20260528230516.1839694-2-mattst88@gmail.com Signed-off-by: Magnus Lindholm --- arch/alpha/kernel/sys_marvel.c | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/arch/alpha/kernel/sys_marvel.c b/arch/alpha/kernel/sys_marvel.c index bebeea3c286d..a37707e05e34 100644 --- a/arch/alpha/kernel/sys_marvel.c +++ b/arch/alpha/kernel/sys_marvel.c @@ -263,6 +263,18 @@ init_io7_irqs(struct io7 *io7, */ printk(" Interrupts reported to CPU at PE %u\n", boot_cpuid); + /* Set up the lsi irqs. */ + for (i = 0; i < 128; ++i) { + irq_set_chip_and_handler(base + i, lsi_ops, handle_level_irq); + irq_set_status_flags(base + i, IRQ_LEVEL); + } + + /* Set up the msi irqs. */ + for (i = 128; i < (128 + 512); ++i) { + irq_set_chip_and_handler(base + i, msi_ops, handle_level_irq); + irq_set_status_flags(base + i, IRQ_LEVEL); + } + raw_spin_lock(&io7->irq_lock); /* set up the error irqs */ @@ -272,12 +284,6 @@ init_io7_irqs(struct io7 *io7, io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, boot_cpuid); io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, boot_cpuid); - /* Set up the lsi irqs. */ - for (i = 0; i < 128; ++i) { - irq_set_chip_and_handler(base + i, lsi_ops, handle_level_irq); - irq_set_status_flags(base + i, IRQ_LEVEL); - } - /* Disable the implemented irqs in hardware. */ for (i = 0; i < 0x60; ++i) init_one_io7_lsi(io7, i, boot_cpuid); @@ -285,13 +291,6 @@ init_io7_irqs(struct io7 *io7, init_one_io7_lsi(io7, 0x74, boot_cpuid); init_one_io7_lsi(io7, 0x75, boot_cpuid); - - /* Set up the msi irqs. */ - for (i = 128; i < (128 + 512); ++i) { - irq_set_chip_and_handler(base + i, msi_ops, handle_level_irq); - irq_set_status_flags(base + i, IRQ_LEVEL); - } - for (i = 0; i < 16; ++i) init_one_io7_msi(io7, i, boot_cpuid);