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  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]
Date:	Sun, 27 Jul 2014 07:52:57 +0400
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Pawel Moll <pawel.moll@....com>, Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Catalin Marinas <Catalin.Marinas@....com>, paul@...an.com,
	Arnd Bergmann <arnd@...db.de>,
	Peter De Schrijver <pdeschrijver@...dia.com>, arm@...nel.org,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 4/5] [SCSI] Do not use platform_bus as a parent

On Sat, 2014-07-26 at 13:11 -0700, Greg Kroah-Hartman wrote:
> On Fri, Jul 25, 2014 at 07:46:56AM -0700, James Bottomley wrote:
> > On Fri, 2014-07-25 at 15:23 +0100, Pawel Moll wrote:
> > > The host devices without a parent were "forcefully adopted"
> > > by platform bus. This patch removes this assignment. In
> > > effect the dev_dev may be NULL now, which means ISA.
> > > 
> > > Cc: James E.J. Bottomley <JBottomley@...allels.com>
> > > Cc: linux-scsi@...r.kernel.org
> > > Signed-off-by: Pawel Moll <pawel.moll@....com>
> > > ---
> > > 
> > > This patch is a part of effort to remove references to platform_bus
> > > and make it static.
> > > 
> > > James, could you please have a look and advice if the change is
> > > correct? Would you happen to know the "real reasons" behind
> > > using the root platform_bus device a parent?
> > 
> > Yes, for DMA purposes, the parent cannot now be NULL; we'll get a panic
> > in the DMA transfers if it is.  A lot of the legacy ISA device on x86
> > and I thought some ARM SOC devices don't pass in the parent device, so
> > we hang them off a known parent.
> 
> The "generic" platform bus device is not a "known parent".  I don't
> understand the difference between just setting the parent to be NULL,
> which will then have a "proper" parent pointer filled in by the driver
> core when the device is registered, or faking it out here.  What is the
> difference?

If you set the parent to NULL, the host template dma_dev will end up
NULL as well and that will trigger a NULL deref panic in the dma segment
routines.

If you want to remove platform_bus, we have to have a well known device
to set dma_dev to at scsi_host_add time.

> In the end, the device always ends up with a parent pointer, right?

The parent pointer isn't the problem ... assigning the correct dma
device is.

James


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists