Re: [PATCH 3/5] drivers/char/pcmcia/ipwireless/main.c: Convertrelease_resource to release_region/release_mem_region

[Dominik Brodowski]

Applied to the pcmcia treee, thanks.

On Sun, Feb 13, 2011 at 01:12:10PM +0100, Julia Lawall wrote:
> Request_region should be used with release_region, not release_resource.
> 
> This patch contains a number of changes, related to calls to request_region,
> request_mem_region, and the associated error handling code.
> 
> 1. For the call to request_region, the variable io_resource storing the
> result is dropped.  The call to release_resource at the end of the function
> is changed to a call to release_region with the first two arguments of
> request_region as its arguments.  The same call to release_region is also
> added to release_ipwireless.
> 
> 2. The first call to request_mem_region is now tested and ret is set to
> -EBUSY if the the call has failed.  This call was associated with the
> initialization of ipw->attr_memory.  But the error handling code was
> testing ipw->common_memory.  The definition of release_ipwireless also
> suggests that this call should be associated with ipw->common_memory, not
> ipw->attr_memory.
> 
> 3. The second call to request_mem_region is now tested and ret is
> set to -EBUSY if the the call has failed.
> 
> 4. The various gotos to the error handling code is adjusted so that there
> is no need for ifs.
> 
> 5. Return the value stored in the ret variable rather than -1.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression x,E;
> @@
> (
> *x = request_region(...)
> |
> *x = request_mem_region(...)
> )
> ... when != release_region(x)
>     when != x = E
> * release_resource(x);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@xxxxxxx>
> 
> ---
> Compiled, not tested.
> In release_ipwireless, should the added call to release_region be protected
> by some if?
> 
>  drivers/char/pcmcia/ipwireless/main.c |   52 ++++++++++++++++++++--------------
>  1 file changed, 32 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/char/pcmcia/ipwireless/main.c b/drivers/char/pcmcia/ipwireless/main.c
> index 94b8eb4..444155a 100644
> --- a/drivers/char/pcmcia/ipwireless/main.c
> +++ b/drivers/char/pcmcia/ipwireless/main.c
> @@ -78,7 +78,6 @@ static void signalled_reboot_callback(void *callback_data)
>  static int ipwireless_probe(struct pcmcia_device *p_dev, void *priv_data)
>  {
>  	struct ipw_dev *ipw = priv_data;
> -	struct resource *io_resource;
>  	int ret;
>  
>  	p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
> @@ -92,9 +91,12 @@ static int ipwireless_probe(struct pcmcia_device *p_dev, void *priv_data)
>  	if (ret)
>  		return ret;
>  
> -	io_resource = request_region(p_dev->resource[0]->start,
> -				resource_size(p_dev->resource[0]),
> -				IPWIRELESS_PCCARD_NAME);
> +	if (!request_region(p_dev->resource[0]->start,
> +			    resource_size(p_dev->resource[0]),
> +			    IPWIRELESS_PCCARD_NAME)) {
> +		ret = -EBUSY;
> +		goto exit;
> +	}
>  
>  	p_dev->resource[2]->flags |=
>  		WIN_DATA_WIDTH_16 | WIN_MEMORY_TYPE_CM | WIN_ENABLE;
> @@ -105,22 +107,25 @@ static int ipwireless_probe(struct pcmcia_device *p_dev, void *priv_data)
>  
>  	ret = pcmcia_map_mem_page(p_dev, p_dev->resource[2], p_dev->card_addr);
>  	if (ret != 0)
> -		goto exit2;
> +		goto exit1;
>  
>  	ipw->is_v2_card = resource_size(p_dev->resource[2]) == 0x100;
>  
> -	ipw->attr_memory = ioremap(p_dev->resource[2]->start,
> +	ipw->common_memory = ioremap(p_dev->resource[2]->start,
>  				resource_size(p_dev->resource[2]));
> -	request_mem_region(p_dev->resource[2]->start,
> -			resource_size(p_dev->resource[2]),
> -			IPWIRELESS_PCCARD_NAME);
> +	if (!request_mem_region(p_dev->resource[2]->start,
> +				resource_size(p_dev->resource[2]),
> +				IPWIRELESS_PCCARD_NAME)) {
> +		ret = -EBUSY;
> +		goto exit2;
> +	}
>  
>  	p_dev->resource[3]->flags |= WIN_DATA_WIDTH_16 | WIN_MEMORY_TYPE_AM |
>  					WIN_ENABLE;
>  	p_dev->resource[3]->end = 0; /* this used to be 0x1000 */
>  	ret = pcmcia_request_window(p_dev, p_dev->resource[3], 0);
>  	if (ret != 0)
> -		goto exit2;
> +		goto exit3;
>  
>  	ret = pcmcia_map_mem_page(p_dev, p_dev->resource[3], 0);
>  	if (ret != 0)
> @@ -128,23 +133,28 @@ static int ipwireless_probe(struct pcmcia_device *p_dev, void *priv_data)
>  
>  	ipw->attr_memory = ioremap(p_dev->resource[3]->start,
>  				resource_size(p_dev->resource[3]));
> -	request_mem_region(p_dev->resource[3]->start,
> -			resource_size(p_dev->resource[3]),
> -			IPWIRELESS_PCCARD_NAME);
> +	if (!request_mem_region(p_dev->resource[3]->start,
> +				resource_size(p_dev->resource[3]),
> +				IPWIRELESS_PCCARD_NAME)) {
> +		ret = -EBUSY;
> +		goto exit4;
> +	}
>  
>  	return 0;
>  
> +exit4:
> +	iounmap(ipw->attr_memory);
>  exit3:
> +	release_mem_region(p_dev->resource[2]->start,
> +			resource_size(p_dev->resource[2]));
>  exit2:
> -	if (ipw->common_memory) {
> -		release_mem_region(p_dev->resource[2]->start,
> -				resource_size(p_dev->resource[2]));
> -		iounmap(ipw->common_memory);
> -	}
> +	iounmap(ipw->common_memory);
>  exit1:
> -	release_resource(io_resource);
> +	release_region(p_dev->resource[0]->start,
> +		       resource_size(p_dev->resource[0]));
> +exit:
>  	pcmcia_disable_device(p_dev);
> -	return -1;
> +	return ret;
>  }
>  
>  static int config_ipwireless(struct ipw_dev *ipw)
> @@ -219,6 +229,8 @@ exit:
>  
>  static void release_ipwireless(struct ipw_dev *ipw)
>  {
> +	release_region(ipw->link->resource[0]->start,
> +		       resource_size(ipw->link->resource[0]));
>  	if (ipw->common_memory) {
>  		release_mem_region(ipw->link->resource[2]->start,
>  				resource_size(ipw->link->resource[2]));
> 
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