5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Song Shuai <songshuaishuai@xxxxxxxxxxx> [ Upstream commit c562ba719df570c986caf0941fea2449150bcbc4 ] If the kexec crash code is called in the interrupt context, the machine_kexec_mask_interrupts() function will trigger a deadlock while trying to acquire the irqdesc spinlock and then deactivate irqchip in irq_set_irqchip_state() function. Unlike arm64, riscv only requires irq_eoi handler to complete EOI and keeping irq_set_irqchip_state() will only leave this possible deadlock without any use. So we simply remove it. Link: https://lore.kernel.org/linux-riscv/20231208111015.173237-1-songshuaishuai@xxxxxxxxxxx/ Fixes: b17d19a5314a ("riscv: kexec: Fixup irq controller broken in kexec crash path") Signed-off-by: Song Shuai <songshuaishuai@xxxxxxxxxxx> Reviewed-by: Ryo Takakura <takakura@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240626023316.539971-1-songshuaishuai@xxxxxxxxxxx Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- arch/riscv/kernel/machine_kexec.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c index db41c676e5a26..7889dfb55cf24 100644 --- a/arch/riscv/kernel/machine_kexec.c +++ b/arch/riscv/kernel/machine_kexec.c @@ -163,20 +163,12 @@ static void machine_kexec_mask_interrupts(void) for_each_irq_desc(i, desc) { struct irq_chip *chip; - int ret; chip = irq_desc_get_chip(desc); if (!chip) continue; - /* - * First try to remove the active state. If this - * fails, try to EOI the interrupt. - */ - ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false); - - if (ret && irqd_irq_inprogress(&desc->irq_data) && - chip->irq_eoi) + if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) chip->irq_eoi(&desc->irq_data); if (chip->irq_mask) -- 2.43.0
