This is a note to let you know that I've just added the patch titled irqchip/realtek-rtl: Service all pending interrupts to the 5.16-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: irqchip-realtek-rtl-service-all-pending-interrupts.patch and it can be found in the queue-5.16 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit eba40991596e1bda07c09650ee88174ae3d608f2 Author: Sander Vanheule <sander@xxxxxxxxxxxxx> Date: Sun Jan 9 15:54:34 2022 +0100 irqchip/realtek-rtl: Service all pending interrupts [ Upstream commit 960dd884ddf5621ae6284cd3a42724500a97ae4c ] Instead of only servicing the lowest pending interrupt line, make sure all pending SoC interrupts are serviced before exiting the chained handler. This adds a small overhead if only one interrupt is pending, but should prevent rapid re-triggering of the handler. Signed-off-by: Sander Vanheule <sander@xxxxxxxxxxxxx> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Link: https://lore.kernel.org/r/5082ad3cb8b4eedf55075561b93eff6570299fe1.1641739718.git.sander@xxxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/irqchip/irq-realtek-rtl.c b/drivers/irqchip/irq-realtek-rtl.c index 568614edd88f4..50a56820c99bc 100644 --- a/drivers/irqchip/irq-realtek-rtl.c +++ b/drivers/irqchip/irq-realtek-rtl.c @@ -76,16 +76,20 @@ static void realtek_irq_dispatch(struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc); struct irq_domain *domain; - unsigned int pending; + unsigned long pending; + unsigned int soc_int; chained_irq_enter(chip, desc); pending = readl(REG(RTL_ICTL_GIMR)) & readl(REG(RTL_ICTL_GISR)); + if (unlikely(!pending)) { spurious_interrupt(); goto out; } + domain = irq_desc_get_handler_data(desc); - generic_handle_domain_irq(domain, __ffs(pending)); + for_each_set_bit(soc_int, &pending, 32) + generic_handle_domain_irq(domain, soc_int); out: chained_irq_exit(chip, desc);