linux-kernel - [PATCH v2 18/23] counter: ftm-quaddec: Convert to new counter registration

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Message-Id: <20211227094526.698714-19-u.kleine-koenig@pengutronix.de>
Date:   Mon, 27 Dec 2021 10:45:21 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>, kernel@...gutronix.de,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-iio@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Syed Nayyar Waris <syednwaris@...il.com>,
        Patrick Havelange <patrick.havelange@...ensium.com>
Subject: [PATCH v2 18/23] counter: ftm-quaddec: Convert to new counter registration

This fixes device lifetime issues where it was possible to free a live
struct device.

Fixes: a3b9a99980d9 ("counter: add FlexTimer Module Quadrature decoder counter driver")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/counter/104-quad-8.c  |  7 ++++---
 drivers/counter/ftm-quaddec.c | 27 +++++++++++++--------------
 2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
index 4315b14f239e..680c7ba943a4 100644
--- a/drivers/counter/104-quad-8.c
+++ b/drivers/counter/104-quad-8.c
@@ -1084,7 +1084,8 @@ static struct counter_count quad8_counts[] = {
 
 static irqreturn_t quad8_irq_handler(int irq, void *private)
 {
-	struct quad8 *const priv = private;
+	struct counter_device *counter = private;
+	struct quad8 *const priv = counter_priv(counter);
 	const unsigned long base = priv->base;
 	unsigned long irq_status;
 	unsigned long channel;
@@ -1115,7 +1116,7 @@ static irqreturn_t quad8_irq_handler(int irq, void *private)
 			continue;
 		}
 
-		counter_push_event(&priv->counter, event, channel);
+		counter_push_event(counter, event, channel);
 	}
 
 	/* Clear pending interrupts on device */
@@ -1192,7 +1193,7 @@ static int quad8_probe(struct device *dev, unsigned int id)
 	outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base[id] + QUAD8_REG_CHAN_OP);
 
 	err = devm_request_irq(dev, irq[id], quad8_irq_handler, IRQF_SHARED,
-			       counter->name, priv);
+			       counter->name, counter);
 	if (err)
 		return err;
 
diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c
index f5d92df6a611..c636183b1337 100644
--- a/drivers/counter/ftm-quaddec.c
+++ b/drivers/counter/ftm-quaddec.c
@@ -26,7 +26,6 @@
 	})
 
 struct ftm_quaddec {
-	struct counter_device counter;
 	struct platform_device *pdev;
 	void __iomem *ftm_base;
 	bool big_endian;
@@ -259,15 +258,16 @@ static struct counter_count ftm_quaddec_counts = {
 
 static int ftm_quaddec_probe(struct platform_device *pdev)
 {
+	struct counter_device *counter;
 	struct ftm_quaddec *ftm;
-
 	struct device_node *node = pdev->dev.of_node;
 	struct resource *io;
 	int ret;
 
-	ftm = devm_kzalloc(&pdev->dev, sizeof(*ftm), GFP_KERNEL);
-	if (!ftm)
+	counter = devm_counter_alloc(&pdev->dev, sizeof(*ftm));
+	if (!counter)
 		return -ENOMEM;
+	ftm = counter_priv(counter);
 
 	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!io) {
@@ -283,14 +283,13 @@ static int ftm_quaddec_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "Failed to map memory region\n");
 		return -EINVAL;
 	}
-	ftm->counter.name = dev_name(&pdev->dev);
-	ftm->counter.parent = &pdev->dev;
-	ftm->counter.ops = &ftm_quaddec_cnt_ops;
-	ftm->counter.counts = &ftm_quaddec_counts;
-	ftm->counter.num_counts = 1;
-	ftm->counter.signals = ftm_quaddec_signals;
-	ftm->counter.num_signals = ARRAY_SIZE(ftm_quaddec_signals);
-	ftm->counter.priv = ftm;
+	counter->name = dev_name(&pdev->dev);
+	counter->parent = &pdev->dev;
+	counter->ops = &ftm_quaddec_cnt_ops;
+	counter->counts = &ftm_quaddec_counts;
+	counter->num_counts = 1;
+	counter->signals = ftm_quaddec_signals;
+	counter->num_signals = ARRAY_SIZE(ftm_quaddec_signals);
 
 	mutex_init(&ftm->ftm_quaddec_mutex);
 
@@ -300,9 +299,9 @@ static int ftm_quaddec_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = devm_counter_register(&pdev->dev, &ftm->counter);
+	ret = devm_counter_add(&pdev->dev, counter);
 	if (ret)
-		return ret;
+		return dev_err_probe(&pdev->dev, ret, "Failed to add counter\n");
 
 	return 0;
 }
-- 
2.33.0