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Date: Wed, 16 Feb 2011 08:21:18 +0100
From: Dominik Brodowski <linux@...inikbrodowski.net>
To: Julia Lawall <julia@...u.dk>
Cc: Jiri Kosina <jkosina@...e.cz>, kernel-janitors@...r.kernel.org,
David Sterba <dsterba@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] drivers/char/pcmcia/ipwireless/main.c: Convert
release_resource to release_region/release_mem_region
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@...u.dk>
>
> ---
> 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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