linux-kernel - [PATCH] counter: 104-quad-8: Fix skipped IRQ lines during events configuration

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Date:   Mon, 15 Aug 2022 08:23:01 -0400
From:   William Breathitt Gray <william.gray@...aro.org>
To:     linux-iio@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        William Breathitt Gray <william.gray@...aro.org>
Subject: [PATCH] counter: 104-quad-8: Fix skipped IRQ lines during events configuration

IRQ trigger configuration is skipped if it has already been set before;
however, the IRQ line still needs to be OR'd to irq_enabled because
irq_enabled is reset for every events_configure call. This patch moves
the irq_enabled OR operation update to before the irq_trigger check so
that IRQ line enablement is not skipped.

Fixes: c95cc0d95702 ("counter: 104-quad-8: Fix persistent enabled events bug")
Signed-off-by: William Breathitt Gray <william.gray@...aro.org>
---
 drivers/counter/104-quad-8.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
index 62c2b7ac4339..4407203e0c9b 100644
--- a/drivers/counter/104-quad-8.c
+++ b/drivers/counter/104-quad-8.c
@@ -449,6 +449,9 @@ static int quad8_events_configure(struct counter_device *counter)
 			return -EINVAL;
 		}
 
+		/* Enable IRQ line */
+		irq_enabled |= BIT(event_node->channel);
+
 		/* Skip configuration if it is the same as previously set */
 		if (priv->irq_trigger[event_node->channel] == next_irq_trigger)
 			continue;
@@ -462,9 +465,6 @@ static int quad8_events_configure(struct counter_device *counter)
 			  priv->irq_trigger[event_node->channel] << 3;
 		iowrite8(QUAD8_CTR_IOR | ior_cfg,
 			 &priv->reg->channel[event_node->channel].control);
-
-		/* Enable IRQ line */
-		irq_enabled |= BIT(event_node->channel);
 	}
 
 	iowrite8(irq_enabled, &priv->reg->index_interrupt);
-- 
2.37.1