linux-kernel - Re: [PATCH 0/3] BusLogic: Message logging neatening

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Date:	Fri, 17 May 2013 14:59:25 -0600
From:	Khalid Aziz <khalid.aziz@...cle.com>
To:	Joe Perches <joe@...ches.com>
CC:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] BusLogic: Message logging neatening

On 05/17/2013 02:35 PM, Joe Perches wrote:
> On Fri, 2013-05-17 at 14:18 -0600, Khalid Aziz wrote:
>> On Thu, 2013-05-16 at 21:58 -0700, Joe Perches wrote:
>>> If you're going through the trouble to fix this CamelCase stuff
>>> and make it work on 64 bit, how about a little more cleanup?
>>
>> Sounds good to me.
>
> btw, for the BusLogic code:
>
> There seem to be places where addresses are cast to u32.
>
> I don't know the code at all, but that could likely
> cause problems with 64 bit addresses.
>
> $ git grep "(u32)" drivers/scsi/BusLogic.c
> drivers/scsi/BusLogic.c:                ccb->dma_handle = (u32) blkp + offset;
> drivers/scsi/BusLogic.c:                fpinfo->base_addr = (u32) adapter->io_addr;
> drivers/scsi/BusLogic.c:        extmbox_req.base_mbox_addr = (u32) adapter->mbox_space_handle;
>

All of those fields indeed hold only a 32-bit address since the driver 
calls pci_set_dma_mask() with DMA mask of 32-bit and then allocates 
memory pointed to by these fields with pci_alloc_consistent(). So I 
think we are ok here.

Manipulation of all these pointers in this code is something that could 
use a cleaner rewrite at some point. The way it is done in the original 
code does not make me comfortable. I cleaned up what could be done 
without a rewrite.

--
Khalid
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