[PATCH] irqchip/mbigen: Fix the clear register offset

Hanjun Guo
2017-04-26T03:10:09Z

Hi Majun,

On 2017/4/25 10:16, Majun wrote:
> From: MaJun <majun258@huawei.com>
>
> Don't minus reserved interrupts (64) when get the clear register offset,because
> the clear register space includes the space of these 64 interrupts.

Could you mention the background that there is a timeout mechanism
to clear the register in the mbigen to make the code work even we clear
the wrong (and noneffective) register? that will help for review I
think.

>
> Signed-off-by: MaJun <majun258@huawei.com>
> ---
> drivers/irqchip/irq-mbigen.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
> index 061cdb8..75818a5 100644
> --- a/drivers/irqchip/irq-mbigen.c
> +++ b/drivers/irqchip/irq-mbigen.c
> @@ -108,7 +108,6 @@ static inline void get_mbigen_clear_reg(irq_hw_number_t hwirq,
> {
> unsigned int ofst;
>
> - hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
> ofst = hwirq / 32 * 4;
>
> *mask = 1 << (hwirq % 32);

How about following to save more lines of code:

--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -106,10 +106,7 @@ static inline void
get_mbigen_type_reg(irq_hw_number_t hwirq,
static inline void get_mbigen_clear_reg(irq_hw_number_t hwirq,
u32 *mask, u32 *addr)
{
- unsigned int ofst;
-
- hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
- ofst = hwirq / 32 * 4;
+ unsigned int ofst = hwirq / 32 * 4;

*mask = 1 << (hwirq % 32);
*addr = ofst + REG_MBIGEN_CLEAR_OFFSET;

Thanks
Hanjun