Re: [PATCH 4/7] net: ieee802154: mcr20a: Use IRQF_NO_AUTOEN flag in request_irq()

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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@xxxxxxxxxx>
---
  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@xxxxxxxxxxxxxxxxxx>

regards
Stefan Schmidt




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