diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-cdev.c | 9 |
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); |