linux-kernel - Re: [PATCH RESEND] riscv: Fix local irq restore when flags indicates irq disabled

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Message-ID: <20230803-curtly-sandbox-9ff8c7aafb85@spud>
Date:   Thu, 3 Aug 2023 15:36:34 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Xu Lu <luxu.kernel@...edance.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] riscv: Fix local irq restore when flags indicates
 irq disabled

Hey,

On Thu, Aug 03, 2023 at 09:28:18PM +0800, Xu Lu wrote:
> 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@...edance.com>
> ---

There's no changelog or explanation, so what is the reason for the
resend?

Cheers,
Conor.

>  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
> 
> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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