Re: [PATCH] USB: musb: dsps: move debugfs_remove_recursive()

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On Apr 22, Felipe Balbi wrote:
> On Tue, Apr 22, 2014 at 11:01:28AM -0300, Ezequiel Garcia wrote:
> > On Apr 02, Felipe Balbi wrote:
> > > Hi,
> > > 
> > > On Wed, Apr 02, 2014 at 06:16:23PM +0200, Daniel Mack wrote:
> > > > On 04/02/2014 06:05 PM, Felipe Balbi wrote:
> > > > > On Wed, Apr 02, 2014 at 11:46:51AM +0200, Daniel Mack wrote:
> > > > 
> > > > >> diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
> > > > >> index 3372ded..e2fd263 100644
> > > > >> --- a/drivers/usb/musb/musb_dsps.c
> > > > >> +++ b/drivers/usb/musb/musb_dsps.c
> > > > >> @@ -470,8 +470,9 @@ static int dsps_musb_exit(struct musb *musb)
> > > > >>  	struct dsps_glue *glue = dev_get_drvdata(dev->parent);
> > > > >>  
> > > > >>  	del_timer_sync(&glue->timer);
> > > > >> -
> > > > >>  	usb_phy_shutdown(musb->xceiv);
> > > > >> +	debugfs_remove_recursive(glue->dbgfs_root);
> > > > >> +
> > > > >>  	return 0;
> > > > >>  }
> > > > >>  
> > > > >> @@ -708,8 +709,6 @@ static int dsps_remove(struct platform_device *pdev)
> > > > >>  	pm_runtime_put(&pdev->dev);
> > > > >>  	pm_runtime_disable(&pdev->dev);
> > > > >>  
> > > > >> -	debugfs_remove_recursive(glue->dbgfs_root);
> > > > > 
> > > > > I don't think this is the right fix. debugfs_remove_recursive is
> > > > > supposed to remove the directory as well. Why isn't dsps_musb_exit()
> > > > > called ?
> > > > 
> > > > dsps_musb_exit() is called, hence my fix works :) The question is rather
> > > > why dsps_remove() isn't called.
> > > > 
> > > > For me, the fix looked obvious, as resources that are claimed in
> > > > dsps_musb_init() should obviously be freed in its counterpart function,
> > > > dsps_musb_exit(). For reasons of readability if not for any other :)
> > > 
> > > you're correct, for whatever reason I read it as moving the lines the
> > > other way around (from _exit() to _remove()).
> > > 
> > > I'll queue this once -rc1 is tagged.
> > > 
> > 
> > Felipe:
> > 
> > This fix didn't land on -rc2, and it's not even in -next.
> > Am I missing something? Is it possible to queue this as urgently as
> > possible?
> 
> Grass hopper, please... :-)
> 
> http://marc.info/?l=linux-usb&m=139809466025568&w=2
> 

Oh, nice. Thanks for taking care of this!

Is there any strong reason for the fixes branch not being part of -next?
Or maybe you should push the patches to your next branch, instead?

I found functionality breaks *very* frequently on early -rc, and it's
usually quicker to take a peek at -next and see if somebody already fixed it.

That way silly grass-hoppers like me won't have to go through the
find-bisect-fix bug cycle, only to discover someone else already fixed
it but the patch is floating around :-)
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
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