[PATCH] staging: dgap: do cleanup on module exit

[Dan Carpenter]

On Tue, Jun 09, 2015 at 10:54:02AM +0000, Gujulan Elango, Hari Prasath (H.) wrote:
> On Tue, Jun 09, 2015 at 03:32:20PM +0530, Sudip Mukherjee wrote:
> > On Tue, Jun 09, 2015 at 09:27:22AM +0000, Gujulan Elango, Hari Prasath (H.) wrote:
> > > From: Hari Prasath Gujulan Elango <hgujulan at visteon.com>
> > > 
> > > Cleanup the device entry,device class & unregister the character device
> > > in the module exit.All this cleanup is done already in the dgap_stop()
> > > function.We need to call this in the cleanup module.
> > No. this is wrong. The same thing what dgap_stop() does is being done in
> > dgap_remove_one() which is the remove callback. So your patch is trying
> > to destroy and unregister something which does not exist at the time dgap_stop()
> > will be called.
> > 
> > regards
> > sudip
> > > 
> 
> sudip,thanks for your comments.while I agree that my patch does the 
> same thing twice,I see that a similar thing is being done in the 
> failure path of the dgap_init_module().I am referring to the 
> goto err_unregister path where the pci_unregister_driver() and 
> dgap_stop() are invoked in succession.Going by your argument,should we 
> remove the redundant cleanup done in the dgap_stop() function.

dgap_init_module() is done correctly.

The module_exit should mirror the module_init.  dgap_remove_one() should
mirror dgap_init_one() but instead it removes bits of everything.

/*
 * dgap_cleanup_module()
 *
 * Module unload.  This is where it all ends.
 */

These comments are obvious.  Delete.

static void dgap_cleanup_module(void)
{
	dgap_remove_driver_sysfiles(&dgap_driver);
	pci_unregister_driver(&dgap_driver);
	dgap_stop();
}

But dgap_remove_one() is all kinds of terrible.

regards,
dan carpenter