[PATCH]: hpilo: fix pointer warning in ilo_ccb_setup

[PATCH]: hpilo: fix pointer warning in ilo_ccb_setup

[Prarit Bhargava]

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Fixes warning:

drivers/misc/hpilo.c: In function ‘ilo_ccb_setup’:
drivers/misc/hpilo.c:274: warning: cast to pointer from integer of different size

Signed-off-by: Prarit Bhargava <prarit@redhat.com>

diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
index 98ad012..b07a541 100644
--- a/drivers/misc/hpilo.c
+++ b/drivers/misc/hpilo.c
@@ -272,7 +272,7 @@ static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
 		return -ENOMEM;
 
 	dma_va = (char *)data->dma_va;
-	dma_pa = (char *)data->dma_pa;
+	dma_pa = (char *)(&data->dma_pa);
 
 	memset(dma_va, 0, data->dma_size);
 

Re: [PATCH]: hpilo: fix pointer warning in ilo_ccb_setup

[Andrew Morton]

On Fri, 21 May 2010 20:50:41 -0400
Prarit Bhargava <prarit@redhat.com> wrote:

> Fixes warning:
> 
> drivers/misc/hpilo.c: In function ___ilo_ccb_setup___:
> drivers/misc/hpilo.c:274: warning: cast to pointer from integer of different size
> 
> Signed-off-by: Prarit Bhargava <prarit@redhat.com>
> 
> diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
> index 98ad012..b07a541 100644
> --- a/drivers/misc/hpilo.c
> +++ b/drivers/misc/hpilo.c
> @@ -272,7 +272,7 @@ static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
>  		return -ENOMEM;
>  
>  	dma_va = (char *)data->dma_va;
> -	dma_pa = (char *)data->dma_pa;
> +	dma_pa = (char *)(&data->dma_pa);
>  
>  	memset(dma_va, 0, data->dma_size);

Seems very wrong - writes to *dmp_pa will now scribble over the `struct
ccb_data'.

Probably local variable dma_pa should have type dma_addr_t.

Re: [PATCH]: hpilo: fix pointer warning in ilo_ccb_setup

[Prarit Bhargava]

On 05/25/2010 05:49 PM, Andrew Morton wrote:
> On Fri, 21 May 2010 20:50:41 -0400
> Prarit Bhargava<prarit@redhat.com>  wrote:
>
>    
>> Fixes warning:
>>
>> drivers/misc/hpilo.c: In function ___ilo_ccb_setup___:
>> drivers/misc/hpilo.c:274: warning: cast to pointer from integer of different size
>>
>> Signed-off-by: Prarit Bhargava<prarit@redhat.com>
>>
>> diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
>> index 98ad012..b07a541 100644
>> --- a/drivers/misc/hpilo.c
>> +++ b/drivers/misc/hpilo.c
>> @@ -272,7 +272,7 @@ static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
>>   		return -ENOMEM;
>>
>>   	dma_va = (char *)data->dma_va;
>> -	dma_pa = (char *)data->dma_pa;
>> +	dma_pa = (char *)(&data->dma_pa);
>>
>>   	memset(dma_va, 0, data->dma_size);
>>      
> Seems very wrong - writes to *dmp_pa will now scribble over the `struct
> ccb_data'.
>
> Probably local variable dma_pa should have type dma_addr_t.
>    

Ugh ... I even passed this by a colleague at HP :/.  I'll fix it up and 
repost.

P.

RE: [PATCH]: hpilo: fix pointer warning in ilo_ccb_setup

[Camuso, Tony]

I guess it would have helped if I asked David what the code did, first. 
":|



-----Original Message-----
From: Prarit Bhargava [mailto:prarit@redhat.com] 
Sent: Tuesday, May 25, 2010 6:10 PM
To: Andrew Morton
Cc: linux-kernel@vger.kernel.org; stable@kernel.org; Altobelli, David; Camuso, Tony
Subject: Re: [PATCH]: hpilo: fix pointer warning in ilo_ccb_setup



On 05/25/2010 05:49 PM, Andrew Morton wrote:
> On Fri, 21 May 2010 20:50:41 -0400
> Prarit Bhargava<prarit@redhat.com>  wrote:
>
>    
>> Fixes warning:
>>
>> drivers/misc/hpilo.c: In function ___ilo_ccb_setup___:
>> drivers/misc/hpilo.c:274: warning: cast to pointer from integer of different size
>>
>> Signed-off-by: Prarit Bhargava<prarit@redhat.com>
>>
>> diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
>> index 98ad012..b07a541 100644
>> --- a/drivers/misc/hpilo.c
>> +++ b/drivers/misc/hpilo.c
>> @@ -272,7 +272,7 @@ static int ilo_ccb_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
>>   		return -ENOMEM;
>>
>>   	dma_va = (char *)data->dma_va;
>> -	dma_pa = (char *)data->dma_pa;
>> +	dma_pa = (char *)(&data->dma_pa);
>>
>>   	memset(dma_va, 0, data->dma_size);
>>      
> Seems very wrong - writes to *dmp_pa will now scribble over the `struct
> ccb_data'.
>
> Probably local variable dma_pa should have type dma_addr_t.
>    

Ugh ... I even passed this by a colleague at HP :/.  I'll fix it up and 
repost.

P.

RE: [PATCH]: hpilo: fix pointer warning in ilo_ccb_setup

[Altobelli, David]

> Seems very wrong - writes to *dmp_pa will now scribble over 
> the `struct ccb_data'.

Yeah.  The dma_pa variable is used to track the physical 
address of the DMA memory, and it is written to the device.  
We don't want a kernel pointer, we want the actual physical addr,
plus the various offsets.

> Probably local variable dma_pa should have type dma_addr_t.

I feel like I tried that, and I had trouble setting or using
the send_fifobar/recv_fifobar variables.  But I probably
didn't try too hard.