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staging: dgap: introduce dgap_stop()

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The dgap_init_module() need to unwind for cleanup variables properly.
Because dgap_init_module() calls dgap_cleanup_module() for freeing
variables but this function is possible to free variables
which are not allocated.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daeseok Youn 2014-10-09 13:40:11 +09:00 committed by Greg Kroah-Hartman
parent 5ba1b07a6e
commit ebf72ccf53
1 changed files with 22 additions and 5 deletions
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27
drivers/staging/dgap/dgap.c
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@ -71,6 +71,7 @@ MODULE_DESCRIPTION("Driver for the Digi International EPCA PCI based product lin
MODULE_SUPPORTED_DEVICE("dgap");
static int dgap_start(void);
static void dgap_stop(void);
static void dgap_init_globals(void);
static struct board_t *dgap_found_board(struct pci_dev *pdev, int id,
int boardnum);
@ -479,19 +480,20 @@ static int dgap_init_module(void)
rc = pci_register_driver(&dgap_driver);
if (rc)
goto err_cleanup;
goto err_stop;
rc = dgap_create_driver_sysfiles(&dgap_driver);
if (rc)
goto err_cleanup;
goto err_unregister;
dgap_driver_state = DRIVER_READY;
return 0;
err_cleanup:
dgap_cleanup_module();
err_unregister:
pci_unregister_driver(&dgap_driver);
err_stop:
dgap_stop();
return rc;
}
@ -561,6 +563,21 @@ static int dgap_start(void)
return rc;
}
static void dgap_stop(void)
{
unsigned long lock_flags;
spin_lock_irqsave(&dgap_poll_lock, lock_flags);
dgap_poll_stop = 1;
spin_unlock_irqrestore(&dgap_poll_lock, lock_flags);
del_timer_sync(&dgap_poll_timer);
device_destroy(dgap_class, MKDEV(DIGI_DGAP_MAJOR, 0));
class_destroy(dgap_class);
unregister_chrdev(DIGI_DGAP_MAJOR, "dgap");
}
static int dgap_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int rc;