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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 29 Apr 2022 11:02:18 -0500
Subject: [PATCH 340/353] genirq: Add lost hunk to irq_forced_thread_fn().
Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=34d634d46859857fa7d866a0b8e4f98e0a5b2a1a
The irq_settings_no_softirq_call() related handling got lost in process,
here are the missing bits.
Reported-by: Martin Kaistra <martin.kaistra@linutronix.de>
Fixes: b0cf5c230e2a0 ("Merge tag 'v4.19.183' into linux-4.19.y-rt")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
---
kernel/irq/manage.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 683debac6759..6ee6d144060f 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -998,7 +998,15 @@ irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
irq_finalize_oneshot(desc, action);
if (!IS_ENABLED(CONFIG_PREEMPT_RT_BASE))
local_irq_enable();
- local_bh_enable();
+ /*
+ * Interrupts which have real time requirements can be set up
+ * to avoid softirq processing in the thread handler. This is
+ * safe as these interrupts do not raise soft interrupts.
+ */
+ if (irq_settings_no_softirq_call(desc))
+ _local_bh_enable();
+ else
+ local_bh_enable();
return ret;
}
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