Re: [patch v2] usb: gadget: f_midi: missing unlock on error path

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On Tue, 5 Jan 2016, Felipe Ferreri Tonello wrote:

> Hi Dan,
> 
> On 05/01/16 12:44, Dan Carpenter wrote:
> > On Tue, Jan 05, 2016 at 01:28:11PM +0100, Julia Lawall wrote:
> >>
> >>
> >> On Tue, 5 Jan 2016, kbuild test robot wrote:
> >>
> >>> Hi Dan,
> >>>
> >>> [auto build test WARNING on balbi-usb/next]
> >>> [also build test WARNING on v4.4-rc8 next-20160105]
> >>> [if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
> >>>
> >>> url:    https://github.com/0day-ci/linux/commits/Dan-Carpenter/usb-gadget-f_midi-missing-unlock-on-error-path/20160105-183115
> >>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git next
> >>>
> >>>
> >>> coccinelle warnings: (new ones prefixed by >>)
> >>>
> >>>>> drivers/usb/gadget/function/f_midi.c:1233:14-21: ERROR: midi is NULL but dereferenced.
> >>
> >> It's a false positive for coccinelle, but I wonder if avoiding duplicating
> >> the mutex_lock is really worth it?
> > 
> > It's not the most beautiful code in the world.  I considered a bunch of
> > different ways to write it...  This is what Felipe Tonello wanted,
> > though.
> 
> This case is not a matter of been pretty but a matter of been less error
> prone.
> 
> What would you suggest?

I thought to be a little less subtle about midi, it would be easier to 
keep the first few mutex_unlocks up where they were.  But up to you.

julia
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