diff --git a/drivers/pps/generators/pps_gen.c b/drivers/pps/generators/pps_gen.c
index 059f4fe6c9b4..d80e28dc31dc 100644
--- a/drivers/pps/generators/pps_gen.c
+++ b/drivers/pps/generators/pps_gen.c
@@ -69,17 +69,28 @@ static long pps_gen_cdev_ioctl(struct file *file,
 		if (ret)
 			return -EFAULT;
 
-		ret = pps_gen->info->enable(pps_gen, status);
-		if (ret)
-			return ret;
-		pps_gen->enabled = status;
+		scoped_guard(mutex, &pps_gen->info_lock) {
+			if (!pps_gen->info)
+				return -ENODEV;
+
+			ret = pps_gen->info->enable(pps_gen, status);
+			if (ret)
+				return ret;
+			pps_gen->enabled = status;
+		}
 
 		break;
 
 	case PPS_GEN_USESYSTEMCLOCK:
 		dev_dbg(&pps_gen->dev, "PPS_GEN_USESYSTEMCLOCK\n");
 
-		ret = put_user(pps_gen->info->use_system_clock, uiuarg);
+		scoped_guard(mutex, &pps_gen->info_lock) {
+			if (!pps_gen->info)
+				return -ENODEV;
+			status = pps_gen->info->use_system_clock;
+		}
+
+		ret = put_user(status, uiuarg);
 		if (ret)
 			return -EFAULT;
 
@@ -212,6 +223,15 @@ static void pps_gen_unregister_cdev(struct pps_gen_device *pps_gen)
 {
 	pr_debug("unregistering pps-gen%d\n", pps_gen->id);
 	cdev_device_del(&pps_gen->cdev, &pps_gen->dev);
+
+	/*
+	 * An open file keeps pps_gen around, but the driver may free info as
+	 * soon as we return. The sysfs files are gone now, so wait for the
+	 * ioctls using info and make later ones fail.
+	 */
+	scoped_guard(mutex, &pps_gen->info_lock)
+		pps_gen->info = NULL;
+
 	put_device(&pps_gen->dev);
 }
 
@@ -243,6 +263,7 @@ struct pps_gen_device *pps_gen_register_source(const struct pps_gen_source_info
 	pps_gen->info = info;
 	pps_gen->enabled = false;
 
+	mutex_init(&pps_gen->info_lock);
 	init_waitqueue_head(&pps_gen->queue);
 	spin_lock_init(&pps_gen->lock);
 
diff --git a/include/linux/pps_gen_kernel.h b/include/linux/pps_gen_kernel.h
index f26f6aac000d..c4d22b1af118 100644
--- a/include/linux/pps_gen_kernel.h
+++ b/include/linux/pps_gen_kernel.h
@@ -11,6 +11,7 @@
 #include <linux/pps_gen.h>
 #include <linux/cdev.h>
 #include <linux/device.h>
+#include <linux/mutex.h>
 
 /*
  * Global defines
@@ -44,6 +45,7 @@ struct pps_gen_source_info {
 /* The main struct */
 struct pps_gen_device {
 	const struct pps_gen_source_info *info;	/* PSS generator info */
+	struct mutex info_lock;			/* protects info */
 	bool enabled;				/* PSS generator status */
 
 	unsigned int event;