linux-kernel - RE: [PATCH] megaraid: Use the proper type to hold the irq number.

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Message-ID: <890BF3111FB9484E9526987D912B261932E31D@NAMAIL3.ad.lsil.com>
Date:	Mon, 7 Aug 2006 15:19:39 -0600
From:	"Ju, Seokmann" <Seokmann.Ju@...l.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Andrew Morton" <akpm@...l.org>
Cc:	"Kolli, Neela" <Neela.Kolli@...enio.com>,
	<linux-scsi@...r.kernel.org>,
	"Protasevich, Natalie" <Natalie.Protasevich@...SYS.com>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] megaraid: Use the proper type to hold the irq number.

Hi
> This patches fixes that problem and the driver now appears
> to work.
> 
> The ioctl interface appears fundamentally broken as it exports
> the irq number to user space in an unsigned char.
Thank you for your findings.
As you mentioned above, driver needs more changes besides your patch.
I will submit a patch covers all required changes, soon.

Thank you again,

Seokmann

> -----Original Message-----
> From: linux-scsi-owner@...r.kernel.org 
> [mailto:linux-scsi-owner@...r.kernel.org] On Behalf Of Eric 
> W. Biederman
> Sent: Monday, August 07, 2006 11:29 AM
> To: Andrew Morton
> Cc: Kolli, Neela; linux-scsi@...r.kernel.org; Protasevich, 
> Natalie; linux-kernel@...r.kernel.org
> Subject: [PATCH] megaraid: Use the proper type to hold the irq number.
> 
> 
> When testing on a Unisys machine it was discovered that
> the megaraid driver would not initialize as it was
> requesting irq 162 instead of irq 1442 it was assigned.
> The problem was the irq number had been truncated by being
> stored in an unsigned char.
> 
> This patches fixes that problem and the driver now appears
> to work.
> 
> The ioctl interface appears fundamentally broken as it exports
> the irq number to user space in an unsigned char. 
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
> ---
>  drivers/scsi/megaraid/mega_common.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/scsi/megaraid/mega_common.h 
> b/drivers/scsi/megaraid/mega_common.h
> index 8cd0bd1..b50e27e 100644
> --- a/drivers/scsi/megaraid/mega_common.h
> +++ b/drivers/scsi/megaraid/mega_common.h
> @@ -175,7 +175,7 @@ typedef struct {
>  	uint8_t			max_lun;
>  
>  	uint32_t		unique_id;
> -	uint8_t			irq;
> +	int			irq;
>  	uint8_t			ito;
>  	caddr_t			ibuf;
>  	dma_addr_t		ibuf_dma_h;
> -- 
> 1.4.2.rc3.g7e18e
> 
> -
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