net: wwan: iosm: drop debugfs dev reference

Post debugfs use call wwan_put_debugfs_dir()to drop
debugfs dev reference.

Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wwan/iosm/iosm_ipc_debugfs.c

@@ -12,10 +12,10 @@
 
 void ipc_debugfs_init(struct iosm_imem *ipc_imem)
 {
-	struct dentry *debugfs_pdev = wwan_get_debugfs_dir(ipc_imem->dev);
+	ipc_imem->debugfs_wwan_dir = wwan_get_debugfs_dir(ipc_imem->dev);
 
 	ipc_imem->debugfs_dir = debugfs_create_dir(KBUILD_MODNAME,
-						   debugfs_pdev);
+						   ipc_imem->debugfs_wwan_dir);
 
 	ipc_imem->trace = ipc_trace_init(ipc_imem);
 	if (!ipc_imem->trace)
@@ -26,4 +26,5 @@ void ipc_debugfs_deinit(struct iosm_imem *ipc_imem)
 {
 	ipc_trace_deinit(ipc_imem->trace);
 	debugfs_remove_recursive(ipc_imem->debugfs_dir);
+	wwan_put_debugfs_dir(ipc_imem->debugfs_wwan_dir);
 }

drivers/net/wwan/iosm/iosm_ipc_imem.h

@@ -341,6 +341,7 @@ enum ipc_phase {
  * @ev_mux_net_transmit_pending:0 means inform the IPC tasklet to pass
  * @reset_det_n:		Reset detect flag
  * @pcie_wake_n:		Pcie wake flag
+ * @debugfs_wwan_dir:		WWAN Debug FS directory entry
  * @debugfs_dir:		Debug FS directory for driver-specific entries
  */
 struct iosm_imem {
@@ -384,6 +385,7 @@ struct iosm_imem {
 	   reset_det_n:1,
 	   pcie_wake_n:1;
 #ifdef CONFIG_WWAN_DEBUGFS
+	struct dentry *debugfs_wwan_dir;
 	struct dentry *debugfs_dir;
 #endif
 };