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path: root/drivers/gpio/gpiolib-cdev.c
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-rw-r--r--drivers/gpio/gpiolib-cdev.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 1438fdca0b..5cca9e8803 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -1199,6 +1199,8 @@ static int edge_detector_update(struct line *line,
struct gpio_v2_line_config *lc,
unsigned int line_idx, u64 edflags)
{
+ u64 eflags;
+ int ret;
u64 active_edflags = READ_ONCE(line->edflags);
unsigned int debounce_period_us =
gpio_v2_line_config_debounce_period(lc, line_idx);
@@ -1210,6 +1212,18 @@ static int edge_detector_update(struct line *line,
/* sw debounced and still will be...*/
if (debounce_period_us && READ_ONCE(line->sw_debounced)) {
line_set_debounce_period(line, debounce_period_us);
+ /*
+ * ensure event fifo is initialised if edge detection
+ * is now enabled.
+ */
+ eflags = edflags & GPIO_V2_LINE_EDGE_FLAGS;
+ if (eflags && !kfifo_initialized(&line->req->events)) {
+ ret = kfifo_alloc(&line->req->events,
+ line->req->event_buffer_size,
+ GFP_KERNEL);
+ if (ret)
+ return ret;
+ }
return 0;
}
@@ -2800,11 +2814,11 @@ static int gpio_chrdev_release(struct inode *inode, struct file *file)
struct gpio_chardev_data *cdev = file->private_data;
struct gpio_device *gdev = cdev->gdev;
- bitmap_free(cdev->watched_lines);
blocking_notifier_chain_unregister(&gdev->device_notifier,
&cdev->device_unregistered_nb);
blocking_notifier_chain_unregister(&gdev->line_state_notifier,
&cdev->lineinfo_changed_nb);
+ bitmap_free(cdev->watched_lines);
gpio_device_put(gdev);
kfree(cdev);