net: ionic: Fix error handling in ionic_init_module()

A problem about ionic create debugfs failed is triggered with the
following log given:

 [  415.799514] debugfs: Directory 'ionic' with parent '/' already present!

The reason is that ionic_init_module() returns ionic_bus_register_driver()
directly without checking its return value, if ionic_bus_register_driver()
failed, it returns without destroy the newly created debugfs, resulting
the debugfs of ionic can never be created later.

 ionic_init_module()
   ionic_debugfs_create() # create debugfs directory
   ionic_bus_register_driver()
     pci_register_driver()
       driver_register()
         bus_add_driver()
           priv = kzalloc(...) # OOM happened
   # return without destroy debugfs directory

Fix by removing debugfs when ionic_bus_register_driver() returns error.

Fixes: fbfb8031533c ("ionic: Add hardware init and device commands")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Acked-by: Shannon Nelson <snelson@pensando.io>
Link: https://lore.kernel.org/r/20221113092929.19161-1-yuancan@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
index 56f93b0..5456c2b 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
@@ -687,8 +687,14 @@ int ionic_port_reset(struct ionic *ionic)
 
 static int __init ionic_init_module(void)
 {
+       int ret;
+
        ionic_debugfs_create();
-       return ionic_bus_register_driver();
+       ret = ionic_bus_register_driver();
+       if (ret)
+               ionic_debugfs_destroy();
+
+       return ret;
 }
 
 static void __exit ionic_cleanup_module(void)