driver core: firmware loader: kill FW_ACTION_NOHOTPLUG requests before suspend

This patch kills the firmware loading requests of FW_ACTION_NOHOTPLUG
before suspend to avoid blocking suspend because there is no timeout
for these requests.

Signed-off-by: Ming Lei <[e-mail]>
Reviewed-by: Takashi Iwai <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/firmware_class.c

···
 	size_t size;
 #ifdef CONFIG_FW_LOADER_USER_HELPER
 	bool is_paged_buf;
+	bool need_uevent;
 	struct page **pages;
 	int nr_pages;
 	int page_array_size;
···
 	}
 
 	if (uevent) {
+		buf->need_uevent = true;
 		dev_set_uevent_suppress(f_dev, false);
 		dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
 		if (timeout != MAX_SCHEDULE_TIMEOUT)
···
 	spin_unlock(&fwc->name_lock);
 }
 
+/* kill pending requests without uevent to avoid blocking suspend */
+static void kill_requests_without_uevent(void)
+{
+	struct firmware_buf *buf;
+	struct firmware_buf *next;
+
+	mutex_lock(&fw_lock);
+	list_for_each_entry_safe(buf, next, &pending_fw_head, pending_list) {
+		if (!buf->need_uevent)
+			 fw_load_abort(buf);
+	}
+	mutex_unlock(&fw_lock);
+}
+
 /**
  * device_cache_fw_images - cache devices' firmware
  *
···
 	switch (mode) {
 	case PM_HIBERNATION_PREPARE:
 	case PM_SUSPEND_PREPARE:
+		kill_requests_without_uevent();
 		device_cache_fw_images();
 		break;