linux-kernel - Re: [PATCH 2/6] treewide: remove using list iterator after loop body as a ptr

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Message-ID: <Yhyv42ONIxTj04mg@kroah.com>
Date:   Mon, 28 Feb 2022 12:20:03 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
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>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        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,
        linux-iio@...r.kernel.org, linux-crypto@...r.kernel.org,
        dmaengine@...r.kernel.org, linux1394-devel@...ts.sourceforge.net,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-rdma@...r.kernel.org, linux-media@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-usb@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        bcm-kernel-feedback-list@...adcom.com, linux-tegra@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, kvm@...r.kernel.org,
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        kgdb-bugreport@...ts.sourceforge.net,
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        tipc-discussion@...ts.sourceforge.net, alsa-devel@...a-project.org
Subject: Re: [PATCH 2/6] treewide: remove using list iterator after loop body
 as a ptr

On Mon, Feb 28, 2022 at 12:08:18PM +0100, Jakob Koschel wrote:
> If the list does not contain the expected element, the value of
> list_for_each_entry() iterator will not point to a valid structure.
> To avoid type confusion in such case, the list iterator
> scope will be limited to list_for_each_entry() loop.
> 
> In preparation to limiting scope of a list iterator to the list traversal
> loop, use a dedicated pointer to point to the found element.
> Determining if an element was found is then simply checking if
> the pointer is != NULL.
> 
> Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
> ---
>  arch/x86/kernel/cpu/sgx/encl.c       |  6 +++--
>  drivers/scsi/scsi_transport_sas.c    | 17 ++++++++-----
>  drivers/thermal/thermal_core.c       | 38 ++++++++++++++++++----------
>  drivers/usb/gadget/configfs.c        | 22 ++++++++++------
>  drivers/usb/gadget/udc/max3420_udc.c | 11 +++++---
>  drivers/usb/gadget/udc/tegra-xudc.c  | 11 +++++---
>  drivers/usb/mtu3/mtu3_gadget.c       | 11 +++++---
>  drivers/usb/musb/musb_gadget.c       | 11 +++++---
>  drivers/vfio/mdev/mdev_core.c        | 11 +++++---
>  9 files changed, 88 insertions(+), 50 deletions(-)

The drivers/usb/ portion of this patch should be in patch 1/X, right?

Also, you will have to split these up per-subsystem so that the
different subsystem maintainers can take these in their trees.

thanks,

greg k-h