linux-kernel - Re: [PATCH] staging: comedi: ni_labpc: fix VIRT_TO

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] [day] [month] [year] [list]

Date:	Tue, 14 May 2013 11:01:50 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Ian Abbott <ian.abbott@....co.uk>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	Frank Mori Hess <fmhess@...rs.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	H Hartley Sweeten <hartleys@...ionengravers.com>
Subject: Re: [PATCH] staging: comedi: ni_labpc: fix VIRT_TO_BUS dependency

On 2013-05-13 22:28, Greg Kroah-Hartman wrote:
> On Mon, May 13, 2013 at 12:02:15PM +0100, Ian Abbott wrote:
>> The "ni_labpc" module acts as a low-level comedi driver for various
>> Nattional Instruments Lab-PC ISA cards if `CONFIG_NI_LABPC_ISA` is
>> enabled, and also as a common module depended on by the "ni_labpc_cs"
>> and "ni_labpc_pci" modules.  For ISA cards, it optionally supports the
>> use of an ISA DMA channel if `CONFIG_ISA_DMA_API` is enabled, using
>> conditionally compiled code.  This conditionally compiled code also
>> relies on `virt_to_bus()`, which only exists if `CONFIG_VIRT_TO_BUS` is
>> enabled.  Therefore, support for ISA DMA should only be compiled in if
>> both `CONFIG_ISA_DMA_API` and `CONFIG_VIRT_TO_BUS` are defined,
>> otherwise the "ni_labpc" module fails to compile on kernels that enable
>> `CONFIG_ISA_DMA_API` but not `CONFIG_VIRT_TO_BUS`.
>>
>> Conditionally define a new macro `NI_LABPC_ISA_DMA` iff both
>> `CONFIG_ISA_DMA_API` and `CONFIG_VIRT_TO_BUS` are defined, and change
>> the conditional compilation tests to use the new macro instead of
>> `CONFIG_ISA_DMA_API`.
>>
>> Also, in the "Kconfig", remove the `VIRT_TO_BUS` dependency from the
>> `COMEDI_NI_LABPC_ISA` option since the dependency is now checked at
>> compile time.
>>
>> Signed-off-by: Ian Abbott <abbotti@....co.uk>
>> ---
>>   drivers/staging/comedi/Kconfig            |  1 -
>>   drivers/staging/comedi/drivers/ni_labpc.c | 18 +++++++++++-------
>>   2 files changed, 11 insertions(+), 8 deletions(-)
>
> Ick, no, I'll take Hartley's patch he sent a week or so ago that fixes
> this properly for all architectures.

Okay, I completely forgot about that patch!  I think the Kconfig part of 
my patch is still valid though, so I'll repost that part.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
--
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/