usb: typec: qcom-pmic-typec: disable cc_debounce_dwork on stopgrafted

cc_debounce_dwork is queued from the set_cc() and start_toggling()
callbacks, which run from TCPM's kthread worker.  port_stop() returns
before tcpm_unregister_port() destroys that worker.  Flushing the worker
during unregister may therefore run a callback which queues the delayed
work after port_stop() has returned.

The delayed work can then run after devres has freed pmic_typec_port.

Use disable_delayed_work_sync() in port_stop() to cancel a pending
instance and prevent the TCPM callbacks from queueing another one.

This issue was found by an in-house static analysis tool.

Fixes: a4422ff22142 ("usb: typec: qcom: Add Qualcomm PMIC Type-C driver")
Cc: stable <stable@kernel.org>  # v6.10+
Assisted-by: Codex:gpt-5.6
Signed-off-by: Fan Wu <fanwu01@zju.edu.cn>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260820135307.153773-2-fanwu01@zju.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 60 insertions, 0 deletions

diff --git a/samples/kdb/Makefile b/samples/kdb/Makefile
new file mode 100644
index 000000000..947cb8522
--- /dev/null
+++ b/samples/kdb/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_SAMPLE_KDB) += kdb_hello.o
diff --git a/samples/kdb/kdb_hello.c b/samples/kdb/kdb_hello.c
new file mode 100644
index 000000000..82736e5a5
--- /dev/null
+++ b/samples/kdb/kdb_hello.c
@@ -0,0 +1,58 @@
+/*
+ * Created by: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (c) 2010 Wind River Systems, Inc.  All Rights Reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/kdb.h>
+
+/*
+ * All kdb shell command call backs receive argc and argv, where
+ * argv[0] is the command the end user typed
+ */
+static int kdb_hello_cmd(int argc, const char **argv)
+{
+	if (argc > 1)
+		return KDB_ARGCOUNT;
+
+	if (argc)
+		kdb_printf("Hello %s.\n", argv[1]);
+	else
+		kdb_printf("Hello world!\n");
+
+	return 0;
+}
+
+static kdbtab_t hello_cmd = {
+	.name = "hello",
+	.func = kdb_hello_cmd,
+	.usage = "[string]",
+	.help = "Say Hello World or Hello [string]",
+};
+
+static int __init kdb_hello_cmd_init(void)
+{
+	/*
+	 * Registration of a dynamically added kdb command is done with
+	 * kdb_register().
+	 */
+	kdb_register(&hello_cmd);
+	return 0;
+}
+
+static void __exit kdb_hello_cmd_exit(void)
+{
+	kdb_unregister(&hello_cmd);
+}
+
+module_init(kdb_hello_cmd_init);
+module_exit(kdb_hello_cmd_exit);
+
+MODULE_AUTHOR("WindRiver");
+MODULE_DESCRIPTION("KDB example to add a hello command");
+MODULE_LICENSE("GPL");