[PATCH RESEND] riscv: Fix local irq restore when flags indicates irq disabled

From: Xu Lu
Date: Thu Aug 03 2023 - 09:31:19 EST


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@xxxxxxxxxxxxx>
---
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 */
--
2.20.1