This is a note to let you know that I've just added the patch titled
genirq: Disable interrupts for force threaded handlers
to the 5.10-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:
genirq-disable-interrupts-for-force-threaded-handlers.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 81e2073c175b887398e5bca6c004efa89983f58d Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Wed, 17 Mar 2021 15:38:52 +0100
Subject: genirq: Disable interrupts for force threaded handlers
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit 81e2073c175b887398e5bca6c004efa89983f58d upstream.
With interrupt force threading all device interrupt handlers are invoked
from kernel threads. Contrary to hard interrupt context the invocation only
disables bottom halfs, but not interrupts. This was an oversight back then
because any code like this will have an issue:
thread(irq_A)
irq_handler(A)
spin_lock(&foo->lock);
interrupt(irq_B)
irq_handler(B)
spin_lock(&foo->lock);
This has been triggered with networking (NAPI vs. hrtimers) and console
drivers where printk() happens from an interrupt which interrupted the
force threaded handler.
Now people noticed and started to change the spin_lock() in the handler to
spin_lock_irqsave() which affects performance or add IRQF_NOTHREAD to the
interrupt request which in turn breaks RT.
Fix the root cause and not the symptom and disable interrupts before
invoking the force threaded handler which preserves the regular semantics
and the usefulness of the interrupt force threading as a general debugging
tool.
For not RT this is not changing much, except that during the execution of
the threaded handler interrupts are delayed until the handler
returns. Vs. scheduling and softirq processing there is no difference.
For RT kernels there is no issue.
Fixes: 8d32a307e4fa ("genirq: Provide forced interrupt threading")
Reported-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Johan Hovold <johan@xxxxxxxxxx>
Acked-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210317143859.513307808@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/irq/manage.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1072,11 +1072,15 @@ irq_forced_thread_fn(struct irq_desc *de
irqreturn_t ret;
local_bh_disable();
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ local_irq_disable();
ret = action->thread_fn(action->irq, action->dev_id);
if (ret == IRQ_HANDLED)
atomic_inc(&desc->threads_handled);
irq_finalize_oneshot(desc, action);
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ local_irq_enable();
local_bh_enable();
return ret;
}
Patches currently in stable-queue which might be from tglx@xxxxxxxxxxxxx are
queue-5.10/genirq-disable-interrupts-for-force-threaded-handlers.patch
queue-5.10/kernel-fs-introduce-and-use-set_restart_fn-and-arch_set_restart_data.patch
queue-5.10/x86-introduce-ts_compat_restart-to-fix-get_nr_restart_syscall.patch
queue-5.10/x86-ioapic-ignore-irq2-again.patch
queue-5.10/x86-move-ts_compat-back-to-asm-thread_info.h.patch
queue-5.10/x86-apic-of-fix-cpu-devicetree-node-lookups.patch
