linux-kernel - Re: [PATCH 10/13] module: pass struct find_symbol_args to find

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Date:   Tue, 2 Feb 2021 16:41:48 +0100
From:   Christoph Hellwig <hch@....de>
To:     Miroslav Benes <mbenes@...e.cz>
Cc:     Christoph Hellwig <hch@....de>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Jessica Yu <jeyu@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>, Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        dri-devel@...ts.freedesktop.org, live-patching@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 10/13] module: pass struct find_symbol_args to
 find_symbol

On Tue, Feb 02, 2021 at 03:07:51PM +0100, Miroslav Benes wrote:
> >  	preempt_disable();
> > -	sym = find_symbol(symbol, &owner, NULL, NULL, true, true);
> > -	if (sym && strong_try_module_get(owner))
> > -		sym = NULL;
> > +	if (!find_symbol(&fsa) || !strong_try_module_get(fsa.owner)) {
> 
> I think this should be in fact
> 
>   if (!find_symbol(&fsa) || strong_try_module_get(fsa.owner)) {
> 
> to get the logic right (note the missing !). We want to return NULL if 
> strong_try_module_get() does not succeed for a found symbol.

Indeed. Fixed for the next version.