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Message-Id: <20240626023316.539971-1-songshuaishuai@tinylab.org>
Date: Wed, 26 Jun 2024 10:33:16 +0800
From: Song Shuai <songshuaishuai@...ylab.org>
To: takakura@...inux.co.jp,
alex@...ti.fr,
paul.walmsley@...ive.com,
palmer@...belt.com
Cc: aou@...s.berkeley.edu,
bhe@...hat.com,
songshuaishuai@...ylab.org,
akpm@...ux-foundation.org,
guoren@...nel.org,
xianting.tian@...ux.alibaba.com,
linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH V2 -fixes] riscv: kexec: Avoid deadlock in kexec crash path
If the kexec crash code is called in the interrupt context, the
machine_kexec_mask_interrupts() function will trigger a deadlock while
trying to acquire the irqdesc spinlock and then deactivate irqchip in
irq_set_irqchip_state() function.
Unlike arm64, riscv only requires irq_eoi handler to complete EOI and
keeping irq_set_irqchip_state() will only leave this possible deadlock
without any use. So we simply remove it.
Link: https://lore.kernel.org/linux-riscv/20231208111015.173237-1-songshuaishuai@tinylab.org/
Fixes: b17d19a5314a ("riscv: kexec: Fixup irq controller broken in kexec crash path")
Signed-off-by: Song Shuai <songshuaishuai@...ylab.org>
---
Changes since V1:
https://lore.kernel.org/linux-riscv/20231208111015.173237-1-songshuaishuai@tinylab.org/
- update the commit log as @Ryo elaborated
- rebase on Linux 6.10-rc3
---
arch/riscv/kernel/machine_kexec.c | 10 +---------
1 file changed, 1 insertion(+), 9 deletions(-)
diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
index ed9cad20c039..3c830a6f7ef4 100644
--- a/arch/riscv/kernel/machine_kexec.c
+++ b/arch/riscv/kernel/machine_kexec.c
@@ -121,20 +121,12 @@ static void machine_kexec_mask_interrupts(void)
for_each_irq_desc(i, desc) {
struct irq_chip *chip;
- int ret;
chip = irq_desc_get_chip(desc);
if (!chip)
continue;
- /*
- * First try to remove the active state. If this
- * fails, try to EOI the interrupt.
- */
- ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
-
- if (ret && irqd_irq_inprogress(&desc->irq_data) &&
- chip->irq_eoi)
+ if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
chip->irq_eoi(&desc->irq_data);
if (chip->irq_mask)
--
2.39.2
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