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);
