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Commit a9455408 authored by Johannes Berg's avatar Johannes Berg
Browse files

cfg80211: make some functions static 



Some of the functions to retrieve a device can
be static as they're used only in nl80211.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 6df653c7

net/wireless/core.c

+0 −63
Original line number Diff line number Diff line
@@ -96,69 +96,6 @@ struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) 
	return &rdev->wiphy;

}



/* requires cfg80211_mutex to be held! */

struct cfg80211_registered_device *

__cfg80211_rdev_from_info(struct genl_info *info)

{

	int ifindex;

	struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;

	struct net_device *dev;

	int err = -EINVAL;



	assert_cfg80211_lock();



	if (info->attrs[NL80211_ATTR_WIPHY]) {

		bywiphyidx = cfg80211_rdev_by_wiphy_idx(

				nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));

		err = -ENODEV;

	}



	if (info->attrs[NL80211_ATTR_IFINDEX]) {

		ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);

		dev = dev_get_by_index(genl_info_net(info), ifindex);

		if (dev) {

			if (dev->ieee80211_ptr)

				byifidx =

					wiphy_to_dev(dev->ieee80211_ptr->wiphy);

			dev_put(dev);

		}

		err = -ENODEV;

	}



	if (bywiphyidx && byifidx) {

		if (bywiphyidx != byifidx)

			return ERR_PTR(-EINVAL);

		else

			return bywiphyidx; /* == byifidx */

	}

	if (bywiphyidx)

		return bywiphyidx;



	if (byifidx)

		return byifidx;



	return ERR_PTR(err);

}



struct cfg80211_registered_device *

cfg80211_get_dev_from_info(struct genl_info *info)

{

	struct cfg80211_registered_device *rdev;



	mutex_lock(&cfg80211_mutex);

	rdev = __cfg80211_rdev_from_info(info);



	/* if it is not an error we grab the lock on

	 * it to assure it won't be going away while

	 * we operate on it */

	if (!IS_ERR(rdev))

		mutex_lock(&rdev->mtx);



	mutex_unlock(&cfg80211_mutex);



	return rdev;

}



struct cfg80211_registered_device *

cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)

{

net/wireless/core.h

+0 −26
Original line number Diff line number Diff line
@@ -159,32 +159,6 @@ static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss) 
struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);

int get_wiphy_idx(struct wiphy *wiphy);



struct cfg80211_registered_device *

__cfg80211_rdev_from_info(struct genl_info *info);



/*

 * This function returns a pointer to the driver

 * that the genl_info item that is passed refers to.

 * If successful, it returns non-NULL and also locks

 * the driver's mutex!

 *

 * This means that you need to call cfg80211_unlock_rdev()

 * before being allowed to acquire &cfg80211_mutex!

 *

 * This is necessary because we need to lock the global

 * mutex to get an item off the list safely, and then

 * we lock the rdev mutex so it doesn't go away under us.

 *

 * We don't want to keep cfg80211_mutex locked

 * for all the time in order to allow requests on

 * other interfaces to go through at the same time.

 *

 * The result of this can be a PTR_ERR and hence must

 * be checked with IS_ERR() for errors.

 */

extern struct cfg80211_registered_device *

cfg80211_get_dev_from_info(struct genl_info *info);



/* requires cfg80211_rdev_mutex to be held! */

struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);

net/wireless/nl80211.c

+82 −0
Original line number Diff line number Diff line
@@ -70,6 +70,88 @@ static int get_rdev_dev_by_ifindex(struct net *netns, struct nlattr **attrs, 
	return 0;

}



static struct cfg80211_registered_device *

__cfg80211_rdev_from_info(struct genl_info *info)

{

	int ifindex;

	struct cfg80211_registered_device *bywiphyidx = NULL, *byifidx = NULL;

	struct net_device *dev;

	int err = -EINVAL;



	assert_cfg80211_lock();



	if (info->attrs[NL80211_ATTR_WIPHY]) {

		bywiphyidx = cfg80211_rdev_by_wiphy_idx(

				nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));

		err = -ENODEV;

	}



	if (info->attrs[NL80211_ATTR_IFINDEX]) {

		ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);

		dev = dev_get_by_index(genl_info_net(info), ifindex);

		if (dev) {

			if (dev->ieee80211_ptr)

				byifidx =

					wiphy_to_dev(dev->ieee80211_ptr->wiphy);

			dev_put(dev);

		}

		err = -ENODEV;

	}



	if (bywiphyidx && byifidx) {

		if (bywiphyidx != byifidx)

			return ERR_PTR(-EINVAL);

		else

			return bywiphyidx; /* == byifidx */

	}

	if (bywiphyidx)

		return bywiphyidx;



	if (byifidx)

		return byifidx;



	return ERR_PTR(err);

}



/*

 * This function returns a pointer to the driver

 * that the genl_info item that is passed refers to.

 * If successful, it returns non-NULL and also locks

 * the driver's mutex!

 *

 * This means that you need to call cfg80211_unlock_rdev()

 * before being allowed to acquire &cfg80211_mutex!

 *

 * This is necessary because we need to lock the global

 * mutex to get an item off the list safely, and then

 * we lock the rdev mutex so it doesn't go away under us.

 *

 * We don't want to keep cfg80211_mutex locked

 * for all the time in order to allow requests on

 * other interfaces to go through at the same time.

 *

 * The result of this can be a PTR_ERR and hence must

 * be checked with IS_ERR() for errors.

 */

static struct cfg80211_registered_device *

cfg80211_get_dev_from_info(struct genl_info *info)

{

	struct cfg80211_registered_device *rdev;



	mutex_lock(&cfg80211_mutex);

	rdev = __cfg80211_rdev_from_info(info);



	/* if it is not an error we grab the lock on

	 * it to assure it won't be going away while

	 * we operate on it */

	if (!IS_ERR(rdev))

		mutex_lock(&rdev->mtx);



	mutex_unlock(&cfg80211_mutex);



	return rdev;

}



/* policy for the attributes */

static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {

	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },