Merge tag 'v5.15.18' into dev-5.15

This is the 5.15.18 stable release

Signed-off-by: Joel Stanley <joel@jms.id.au>

2 files changed, 52 insertions, 6 deletions

diff --git a/drivers/iio/adc/ti-adc081c.c b/drivers/iio/adc/ti-adc081c.c
index 16fc608db36a..bd48b073e720 100644
--- a/drivers/iio/adc/ti-adc081c.c
+++ b/drivers/iio/adc/ti-adc081c.c
@@ -19,6 +19,7 @@
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
+#include <linux/property.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/buffer.h>
@@ -156,13 +157,16 @@ static int adc081c_probe(struct i2c_client *client,
 {
 	struct iio_dev *iio;
 	struct adc081c *adc;
-	struct adcxx1c_model *model;
+	const struct adcxx1c_model *model;
 	int err;
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 		return -EOPNOTSUPP;
 
-	model = &adcxx1c_models[id->driver_data];
+	if (dev_fwnode(&client->dev))
+		model = device_get_match_data(&client->dev);
+	else
+		model = &adcxx1c_models[id->driver_data];
 
 	iio = devm_iio_device_alloc(&client->dev, sizeof(*adc));
 	if (!iio)
@@ -210,10 +214,17 @@ static const struct i2c_device_id adc081c_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, adc081c_id);
 
+static const struct acpi_device_id adc081c_acpi_match[] = {
+	/* Used on some AAEON boards */
+	{ "ADC081C", (kernel_ulong_t)&adcxx1c_models[ADC081C] },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, adc081c_acpi_match);
+
 static const struct of_device_id adc081c_of_match[] = {
-	{ .compatible = "ti,adc081c" },
-	{ .compatible = "ti,adc101c" },
-	{ .compatible = "ti,adc121c" },
+	{ .compatible = "ti,adc081c", .data = &adcxx1c_models[ADC081C] },
+	{ .compatible = "ti,adc101c", .data = &adcxx1c_models[ADC101C] },
+	{ .compatible = "ti,adc121c", .data = &adcxx1c_models[ADC121C] },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, adc081c_of_match);
@@ -222,6 +233,7 @@ static struct i2c_driver adc081c_driver = {
 	.driver = {
 		.name = "adc081c",
 		.of_match_table = adc081c_of_match,
+		.acpi_match_table = adc081c_acpi_match,
 	},
 	.probe = adc081c_probe,
 	.id_table = adc081c_id,
diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
index 93990ff1dfe3..f504ed351b3e 100644
--- a/drivers/iio/industrialio-trigger.c
+++ b/drivers/iio/industrialio-trigger.c
@@ -162,6 +162,39 @@ static struct iio_trigger *iio_trigger_acquire_by_name(const char *name)
 	return trig;
 }
 
+static void iio_reenable_work_fn(struct work_struct *work)
+{
+	struct iio_trigger *trig = container_of(work, struct iio_trigger,
+						reenable_work);
+
+	/*
+	 * This 'might' occur after the trigger state is set to disabled -
+	 * in that case the driver should skip reenabling.
+	 */
+	trig->ops->reenable(trig);
+}
+
+/*
+ * In general, reenable callbacks may need to sleep and this path is
+ * not performance sensitive, so just queue up a work item
+ * to reneable the trigger for us.
+ *
+ * Races that can cause this.
+ * 1) A handler occurs entirely in interrupt context so the counter
+ *    the final decrement is still in this interrupt.
+ * 2) The trigger has been removed, but one last interrupt gets through.
+ *
+ * For (1) we must call reenable, but not in atomic context.
+ * For (2) it should be safe to call reenanble, if drivers never blindly
+ * reenable after state is off.
+ */
+static void iio_trigger_notify_done_atomic(struct iio_trigger *trig)
+{
+	if (atomic_dec_and_test(&trig->use_count) && trig->ops &&
+	    trig->ops->reenable)
+		schedule_work(&trig->reenable_work);
+}
+
 void iio_trigger_poll(struct iio_trigger *trig)
 {
 	int i;
@@ -173,7 +206,7 @@ void iio_trigger_poll(struct iio_trigger *trig)
 			if (trig->subirqs[i].enabled)
 				generic_handle_irq(trig->subirq_base + i);
 			else
-				iio_trigger_notify_done(trig);
+				iio_trigger_notify_done_atomic(trig);
 		}
 	}
 }
@@ -535,6 +568,7 @@ struct iio_trigger *viio_trigger_alloc(struct device *parent,
 	trig->dev.type = &iio_trig_type;
 	trig->dev.bus = &iio_bus_type;
 	device_initialize(&trig->dev);
+	INIT_WORK(&trig->reenable_work, iio_reenable_work_fn);
 
 	mutex_init(&trig->pool_lock);
 	trig->subirq_base = irq_alloc_descs(-1, 0,