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Date: Wed, 16 Feb 2011 09:44:50 +0100 (CET)
From: Jiri Kosina <jkosina@...e.cz>
To: Dominik Brodowski <linux@...inikbrodowski.net>
Cc: Julia Lawall <julia@...u.dk>, 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
On Wed, 16 Feb 2011, Dominik Brodowski wrote:
> Applied to the pcmcia treee, thanks.
FWIW
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> 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]));
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>
--
Jiri Kosina
SUSE Labs, Novell Inc.
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