linux-kernel - Re: [PATCH 2/2] i915: do not leak module ref counter

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Date:   Fri, 2 Aug 2019 22:15:23 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] i915: do not leak module ref counter

On (08/02/19 14:10), Chris Wilson wrote:
> > >  drivers/gpu/drm/i915/gem/i915_gemfs.c | 4 +++-
> > >  1 file changed, 3 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/gem/i915_gemfs.c b/drivers/gpu/drm/i915/gem/i915_gemfs.c
> > > index cf05ba72df9d..d437188d1736 100644
> > > --- a/drivers/gpu/drm/i915/gem/i915_gemfs.c
> > > +++ b/drivers/gpu/drm/i915/gem/i915_gemfs.c
> > > @@ -24,8 +24,10 @@ int i915_gemfs_init(struct drm_i915_private *i915)
> > >                 return -ENODEV;
> > >  
> > >         gemfs = kern_mount(type);
> > 
> > Looking around, it looks like we always need to drop type after
> > mounting. Should the
> >         put_filesystem(type);
> > be here instead?
> > 
> > Anyway, nice catch.
> 
> Sigh. put_filesystem() is part of fs internals. I'd be tempted to add

Good catch!

So we can switch to vfs_kern_mount(), I guess, but pass different options,
depending on has_transparent_hugepage().

	-ss