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From: Xu Lu <luxu.kernel@bytedance.com>
To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	Xu Lu <luxu.kernel@bytedance.com>
Subject: [PATCH] riscv: Fix local irq restore when flags indicates irq disabled
Date: Tue, 25 Jul 2023 15:05:49 +0800	[thread overview]
Message-ID: <20230725070549.89810-1-luxu.kernel@bytedance.com> (raw)

When arch_local_irq_restore() is called with flags indicating irqs
disabled, we need to clear SR_IE bit in CSR_STATUS, whereas current
implementation based on csr_set() function only sets SR_IE bit of
CSR_STATUS when SR_IE bit of flags is high and does nothing when
SR_IE bit of flags is low.

This commit supplies csr clear operation when calling irq restore
function with flags indicating irq disabled.

Fixes: 6d60b6ee0c97 ("RISC-V: Device, timer, IRQs, and the SBI")
Signed-off-by: Xu Lu <luxu.kernel@bytedance.com>
---
 arch/riscv/include/asm/irqflags.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/irqflags.h b/arch/riscv/include/asm/irqflags.h
index 08d4d6a5b7e9..7c31fc3c3559 100644
--- a/arch/riscv/include/asm/irqflags.h
+++ b/arch/riscv/include/asm/irqflags.h
@@ -49,7 +49,10 @@ static inline int arch_irqs_disabled(void)
 /* set interrupt enabled status */
 static inline void arch_local_irq_restore(unsigned long flags)
 {
-	csr_set(CSR_STATUS, flags & SR_IE);
+	if (flags & SR_IE)
+		csr_set(CSR_STATUS, SR_IE);
+	else
+		csr_clear(CSR_STATUS, SR_IE);
 }
 
 #endif /* _ASM_RISCV_IRQFLAGS_H */
-- 
2.39.2 (Apple Git-143)


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WARNING: multiple messages have this Message-ID (diff)
From: Xu Lu <luxu.kernel@bytedance.com>
To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	Xu Lu <luxu.kernel@bytedance.com>
Subject: [PATCH] riscv: Fix local irq restore when flags indicates irq disabled
Date: Tue, 25 Jul 2023 15:05:49 +0800	[thread overview]
Message-ID: <20230725070549.89810-1-luxu.kernel@bytedance.com> (raw)

When arch_local_irq_restore() is called with flags indicating irqs
disabled, we need to clear SR_IE bit in CSR_STATUS, whereas current
implementation based on csr_set() function only sets SR_IE bit of
CSR_STATUS when SR_IE bit of flags is high and does nothing when
SR_IE bit of flags is low.

This commit supplies csr clear operation when calling irq restore
function with flags indicating irq disabled.

Fixes: 6d60b6ee0c97 ("RISC-V: Device, timer, IRQs, and the SBI")
Signed-off-by: Xu Lu <luxu.kernel@bytedance.com>
---
 arch/riscv/include/asm/irqflags.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/irqflags.h b/arch/riscv/include/asm/irqflags.h
index 08d4d6a5b7e9..7c31fc3c3559 100644
--- a/arch/riscv/include/asm/irqflags.h
+++ b/arch/riscv/include/asm/irqflags.h
@@ -49,7 +49,10 @@ static inline int arch_irqs_disabled(void)
 /* set interrupt enabled status */
 static inline void arch_local_irq_restore(unsigned long flags)
 {
-	csr_set(CSR_STATUS, flags & SR_IE);
+	if (flags & SR_IE)
+		csr_set(CSR_STATUS, SR_IE);
+	else
+		csr_clear(CSR_STATUS, SR_IE);
 }
 
 #endif /* _ASM_RISCV_IRQFLAGS_H */
-- 
2.39.2 (Apple Git-143)


             reply	other threads:[~2023-07-25  7:06 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-25  7:05 Xu Lu [this message]
2023-07-25  7:05 ` [PATCH] riscv: Fix local irq restore when flags indicates irq disabled Xu Lu
2023-08-09  6:05 ` Palmer Dabbelt
2023-08-09  6:05   ` Palmer Dabbelt
2023-08-09  6:58   ` [External] " 旭路
2023-08-09  6:58     ` 旭路
2023-08-24 12:08     ` Xu Lu
2023-08-24 12:08       ` Xu Lu
  -- strict thread matches above, loose matches on Subject: below --
2023-07-24 13:27 luxu.kernel
2023-07-24 13:27 ` luxu.kernel
2023-07-24 13:42 ` Ben Dooks
2023-07-24 13:42   ` Ben Dooks
2023-07-24 14:03   ` Conor Dooley
2023-07-25  6:25     ` Xu Lu
2023-07-25  6:25       ` Xu Lu

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