at86rf230: detailed edge triggered irq warning

This patch introduce a more detailed information why edge triggered
irq's are currently not recommended. It could be that rising/falling
edge detection can happen while the irq is disabled.

Suggested-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 19c16b9..b8b0628 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -1376,7 +1376,7 @@
 	if (irq_type == IRQ_TYPE_EDGE_RISING ||
 	    irq_type == IRQ_TYPE_EDGE_FALLING)
 		dev_warn(&lp->spi->dev,
-			 "Using edge triggered irq's are not recommended!\n");
+			 "Using edge triggered irq's are not recommended, because it can cause races and result in a non-functional driver!\n");
 	if (irq_type == IRQ_TYPE_EDGE_FALLING ||
 	    irq_type == IRQ_TYPE_LEVEL_LOW)
 		irq_pol = IRQ_ACTIVE_LOW;