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author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2022-04-10 15:49:36 +0300 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2022-04-13 22:32:21 +0300 |
commit | 75d8cce128c516fe6cf4b8683e8fe1a59e919902 (patch) | |
tree | c90aa58d0e8ae63b4915d5af63c63ebc499fb561 /lib/crc4.c | |
parent | ce522ba9ef7e2d9fb22a39eb3371c0c64e2a433e (diff) | |
download | linux-75d8cce128c516fe6cf4b8683e8fe1a59e919902.tar.xz |
lib/irq_poll: Prevent softirq pending leak in irq_poll_cpu_dead()
irq_poll_cpu_dead() pulls the blk_cpu_iopoll backlog from the dead CPU and
raises the POLL softirq with __raise_softirq_irqoff() on the CPU it is
running on. That just sets the bit in the pending softirq mask.
This means the handling of the softirq is delayed until the next interrupt
or a local_bh_disable/enable() pair. As a consequence the CPU on which this
code runs can reach idle with the POLL softirq pending, which triggers a
warning in the NOHZ idle code.
Add a local_bh_disable/enable() pair around the interrupts disabled section
in irq_poll_cpu_dead(). local_bh_enable will handle the pending softirq.
[tglx: Massaged changelog and comment]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/87k0bxgl27.ffs@tglx
Diffstat (limited to 'lib/crc4.c')
0 files changed, 0 insertions, 0 deletions