linux-kernel - Re: [PATCH] cciss: use check

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Date:	Tue, 3 Apr 2012 08:45:54 -0500
From:	scameron@...rdog.cce.hp.com
To:	akinobu.mita@...il.com
Cc:	linux-kernel@...r.kernel.org, scameron@...rdog.cce.hp.com,
	mike.miller@...rdog.cce.hp.com, mike.miller@...com,
	iss_storagedev@...com
Subject: Re: [PATCH] cciss: use check_signature 

> Use check_signature to find a signature in the mmio address.
> 
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> Cc: Mike Miller <mike.miller@...com>
> Cc: iss_storagedev@...com
> ---
>  drivers/block/cciss.c |    7 ++-----
>  1 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
> index bda6d12..e04c63e 100644
> --- a/drivers/block/cciss.c
> +++ b/drivers/block/cciss.c
> @@ -42,8 +42,8 @@
>  #include <linux/compat.h>
>  #include <linux/mutex.h>
>  #include <linux/bitmap.h>
> +#include <linux/io.h>
>  #include <asm/uaccess.h>
> -#include <asm/io.h>
>  
>  #include <linux/dma-mapping.h>
>  #include <linux/blkdev.h>
> @@ -4267,10 +4267,7 @@ static void __devinit cciss_find_board_params(ctlr_info_t *h)
>  
>  static inline bool CISS_signature_present(ctlr_info_t *h)
>  {
> -       if ((readb(&h->cfgtable->Signature[0]) != 'C') ||
> -           (readb(&h->cfgtable->Signature[1]) != 'I') ||
> -           (readb(&h->cfgtable->Signature[2]) != 'S') ||
> -           (readb(&h->cfgtable->Signature[3]) != 'S')) {
> +       if (!check_signature(h->cfgtable->Signature, "CISS", 4)) {

I noticed that in lib/Makefile, there's this:

[scameron@...alhost linux-3.4-rc1]$ grep CHECK_SIG lib/Makefile
obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
[scameron@...alhost linux-3.4-rc1]$

although I don't see an '#if CONFIG_CHECK_SIGNATURE' in include/linux/io.h

Does there need to be a "select CHECK_SIGNATURE" added into
in drivers/block/Kconfig in this area?

config BLK_CPQ_CISS_DA
        tristate "Compaq Smart Array 5xxx support"
        depends on PCI
        help

Or is this dependency handled in some way I'm just not seeing?

-- steve

>                  dev_warn(&h->pdev->dev, "not a valid CISS config table\n");
>                  return false;
>          }
> -- 
> 1.7.4.4
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