disable_irq() after request_irq() still has a time gap in which
interrupts can come. request_irq() with IRQF_NO_AUTOEN flag will
disable IRQ auto-enable when request IRQ.

Fixes: 8c6ad9cc5157 ("ieee802154: Add NXP MCR20A IEEE 802.15.4 transceiver driver")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
---
 drivers/net/ieee802154/mcr20a.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/net/ieee802154/mcr20a.c b/drivers/net/ieee802154/mcr20a.c
index 433fb5839203..020d392a98b6 100644
--- a/drivers/net/ieee802154/mcr20a.c
+++ b/drivers/net/ieee802154/mcr20a.c
@@ -1302,16 +1302,13 @@ mcr20a_probe(struct spi_device *spi)
 		irq_type = IRQF_TRIGGER_FALLING;
 
 	ret = devm_request_irq(&spi->dev, spi->irq, mcr20a_irq_isr,
-			       irq_type, dev_name(&spi->dev), lp);
+			       irq_type | IRQF_NO_AUTOEN, dev_name(&spi->dev), lp);
 	if (ret) {
 		dev_err(&spi->dev, "could not request_irq for mcr20a\n");
 		ret = -ENODEV;
 		goto free_dev;
 	}
 
-	/* disable_irq by default and wait for starting hardware */
-	disable_irq(spi->irq);
-
 	ret = ieee802154_register_hw(hw);
 	if (ret) {
 		dev_crit(&spi->dev, "ieee802154_register_hw failed\n");
-- 
2.34.1

Hello Jinjie Ruan.

On 9/9/24 3:30 PM, Jinjie Ruan wrote:
> disable_irq() after request_irq() still has a time gap in which
> interrupts can come. request_irq() with IRQF_NO_AUTOEN flag will
> disable IRQ auto-enable when request IRQ.
> 
> Fixes: 8c6ad9cc5157 ("ieee802154: Add NXP MCR20A IEEE 802.15.4 transceiver driver")
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
> ---
>   drivers/net/ieee802154/mcr20a.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ieee802154/mcr20a.c b/drivers/net/ieee802154/mcr20a.c
> index 433fb5839203..020d392a98b6 100644
> --- a/drivers/net/ieee802154/mcr20a.c
> +++ b/drivers/net/ieee802154/mcr20a.c
> @@ -1302,16 +1302,13 @@ mcr20a_probe(struct spi_device *spi)
>   		irq_type = IRQF_TRIGGER_FALLING;
>   
>   	ret = devm_request_irq(&spi->dev, spi->irq, mcr20a_irq_isr,
> -			       irq_type, dev_name(&spi->dev), lp);
> +			       irq_type | IRQF_NO_AUTOEN, dev_name(&spi->dev), lp);
>   	if (ret) {
>   		dev_err(&spi->dev, "could not request_irq for mcr20a\n");
>   		ret = -ENODEV;
>   		goto free_dev;
>   	}
>   
> -	/* disable_irq by default and wait for starting hardware */
> -	disable_irq(spi->irq);
> -
>   	ret = ieee802154_register_hw(hw);
>   	if (ret) {
>   		dev_crit(&spi->dev, "ieee802154_register_hw failed\n");


Dave, Eric, Jakub, if you are taking them into net/net-next directly 
here is my ack (and Miquel's review as well).

Acked-by: Stefan Schmidt <stefan@datenfreihafen.org>

regards
Stefan Schmidt

Hi Jinjie,

ruanjinjie@huawei.com wrote on Mon, 9 Sep 2024 21:30:31 +0800:

> disable_irq() after request_irq() still has a time gap in which
> interrupts can come. request_irq() with IRQF_NO_AUTOEN flag will
> disable IRQ auto-enable when request IRQ.
> 
> Fixes: 8c6ad9cc5157 ("ieee802154: Add NXP MCR20A IEEE 802.15.4 transceiver driver")
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>

This one could go through wpan(-next), but otherwise:

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

Thanks,
Miquèl