ASoC: stm32: sai: fix device and OF node leaks on

Merge series from Johan Hovold <johan@kernel.org>:

This series fixes device and OF node reference leaks during probe and
a clock prepare imbalance on probe failures.

Included is a related cleanup of an error path.

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 175836467f21..d8d93059ac04 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -2548,10 +2548,17 @@ static int lineinfo_changed_notify(struct notifier_block *nb,
 		container_of(nb, struct gpio_chardev_data, lineinfo_changed_nb);
 	struct lineinfo_changed_ctx *ctx;
 	struct gpio_desc *desc = data;
+	struct file *fp;
 
 	if (!test_bit(gpio_chip_hwgpio(desc), cdev->watched_lines))
 		return NOTIFY_DONE;
 
+	/* Keep the file descriptor alive for the duration of the notification. */
+	fp = get_file_active(&cdev->fp);
+	if (!fp)
+		/* Chardev file descriptor was or is being released. */
+		return NOTIFY_DONE;
+
 	/*
 	 * If this is called from atomic context (for instance: with a spinlock
 	 * taken by the atomic notifier chain), any sleeping calls must be done
@@ -2575,8 +2582,6 @@ static int lineinfo_changed_notify(struct notifier_block *nb,
 	/* Keep the GPIO device alive until we emit the event. */
 	ctx->gdev = gpio_device_get(desc->gdev);
 	ctx->cdev = cdev;
-	/* Keep the file descriptor alive too. */
-	get_file(ctx->cdev->fp);
 
 	INIT_WORK(&ctx->work, lineinfo_changed_func);
 	queue_work(ctx->gdev->line_state_wq, &ctx->work);