linux-kernel - Re: [PATCH 1/4] amba: Export amba

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180516091841.GH16141@n2100.armlinux.org.uk>
Date:   Wed, 16 May 2018 10:18:41 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Kim Phillips <kim.phillips@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Gargi Sharma <gs051095@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Rik van Riel <riel@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Thierry Reding <treding@...dia.com>,
        Todd Kjos <tkjos@...gle.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] amba: Export amba_bustype

On Wed, May 16, 2018 at 12:16:28PM +0300, Andy Shevchenko wrote:
> On Tue, May 8, 2018 at 10:06 PM, Kim Phillips <kim.phillips@....com> wrote:
> > This patch is provided in the context of allowing the Coresight driver
> > subsystem to be loaded as modules.  Coresight uses amba_bus in its call
> > to bus_find_device() in of_coresight_get_endpoint_device() when
> > searching for a configurable endpoint device.  This patch allows
> > Coresight to reference amba_bustype when built as a module.
> 
> > --- a/drivers/amba/bus.c
> > +++ b/drivers/amba/bus.c
> > @@ -197,6 +197,7 @@ struct bus_type amba_bustype = {
> >         .pm             = &amba_pm,
> >         .force_dma      = true,
> >  };
> > +EXPORT_SYMBOL_GPL(amba_bustype);
> 
> Oh,
> 
> What wrong with the approach let's say similar to PCI bus?
> 
> Whenever you have a struct device you may use two helpers:
> 
> dev_is_pci() -> is the device of PCI bus type?
> to_pci_dev() -> get's container of struct device for PCI bus case

How does that help with bus_find_device() which requires the bus_type
structure for the type of devices to be searched?

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 8.8Mbps down 630kbps up
According to speedtest.net: 8.21Mbps down 510kbps up