linux-kernel - Re: [PATCH 3/6] treewide: fix incorrect use to determine if list is empty

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Date:   Mon, 28 Feb 2022 14:38:58 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Jakob Koschel <jakobkoschel@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnd Bergman <arnd@...db.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Mike Rapoport <rppt@...nel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Brian Johannesmeyer <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Nathan Chancellor <nathan@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-sgx@...r.kernel.org,
        drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
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        dmaengine@...r.kernel.org, linux1394-devel@...ts.sourceforge.net,
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        tipc-discussion@...ts.sourceforge.net, alsa-devel@...a-project.org
Subject: Re: [PATCH 3/6] treewide: fix incorrect use to determine if list is
 empty

On Mon, Feb 28, 2022 at 12:08:19PM +0100, Jakob Koschel wrote:
> The list iterator value will *always* be set by list_for_each_entry().
> It is incorrect to assume that the iterator value will be NULL if the
> list is empty.
> 
> Instead of checking the pointer it should be checked if
> the list is empty.
> In acpi_get_pmu_hw_inf() instead of setting the pointer to NULL
> on the break, it is set to the correct value and leaving it
> NULL if no element was found.
> 
> Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
> ---
>  arch/powerpc/sysdev/fsl_gtm.c            |  4 ++--
>  drivers/media/pci/saa7134/saa7134-alsa.c |  4 ++--
>  drivers/perf/xgene_pmu.c                 | 13 +++++++------
>  3 files changed, 11 insertions(+), 10 deletions(-)

These are all bug fixes.

1) Send them as 3 separate patches.
2) Add Fixes tags.

regards,
dan carpenter