pci_unregister_driver() should be used once dgnc module exit. It has nothing to do with dgnc_NumBoards. Remove the judgment of dgnc_NumBoards to avoid pci_unregister_driver() is not used when dgnc_NumBoards is 0. Signed-off-by: Navy Cheng <navych@126.com> --- drivers/staging/dgnc/dgnc_driver.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/staging/dgnc/dgnc_driver.c b/drivers/staging/dgnc/dgnc_driver.c index fc6d298..20b0c3b 100644 --- a/drivers/staging/dgnc/dgnc_driver.c +++ b/drivers/staging/dgnc/dgnc_driver.c @@ -156,8 +156,7 @@ static void dgnc_cleanup_module(void) dgnc_tty_post_uninit(); - if (dgnc_NumBoards) - pci_unregister_driver(&dgnc_driver); + pci_unregister_driver(&dgnc_driver); } /* -- 2.1.4