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wireless: Use first phyX name available when registering phy devices.

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Choose first available phyX name when creating phy devices.  This
means that reloading a wifi driver will not cause a change in the
name of it's phy device.

Also, allow users to rename a phy to any un-used name, including
phy%d.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ben Greear 2010-09-27 09:07:26 -07:00 committed by John W. Linville
parent b1a9338d5e
commit 5a254ffe3f
1 changed files with 30 additions and 24 deletions
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54
net/wireless/core.c
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@ -178,26 +178,10 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
char *newname)
{
struct cfg80211_registered_device *rdev2;
int wiphy_idx, taken = -1, result, digits;
int result;
assert_cfg80211_lock();
/* prohibit calling the thing phy%d when %d is not its number */
sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
/* count number of places needed to print wiphy_idx */
digits = 1;
while (wiphy_idx /= 10)
digits++;
/*
* deny the name if it is phy<idx> where <idx> is printed
* without leading zeroes. taken == strlen(newname) here
*/
if (taken == strlen(PHY_NAME) + digits)
return -EINVAL;
}
/* Ignore nop renames */
if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
return 0;
@ -205,7 +189,7 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
/* Ensure another device does not already have this name. */
list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
return -EINVAL;
return -EEXIST;
result = device_rename(&rdev->wiphy.dev, newname);
if (result)
@ -320,9 +304,11 @@ static void cfg80211_event_work(struct work_struct *work)
struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
{
static int wiphy_counter;
struct cfg80211_registered_device *rdev;
int i;
struct cfg80211_registered_device *rdev, *rdev2;
int alloc_size;
char nname[IFNAMSIZ + 1];
bool found = false;
WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
@ -346,16 +332,36 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
if (unlikely(!wiphy_idx_valid(rdev->wiphy_idx))) {
wiphy_counter--;
goto too_many_devs;
}
/* 64k wiphy devices is enough for anyone! */
for (i = 0; i < 0xFFFF; i++) {
found = false;
snprintf(nname, sizeof(nname)-1, PHY_NAME "%d", i);
nname[sizeof(nname)-1] = 0;
list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
if (strcmp(nname, dev_name(&rdev2->wiphy.dev)) == 0) {
found = true;
break;
}
if (!found)
break;
}
if (unlikely(found)) {
too_many_devs:
mutex_unlock(&cfg80211_mutex);
/* ugh, wrapped! */
/* ugh, too many devices already! */
kfree(rdev);
return NULL;
}
mutex_unlock(&cfg80211_mutex);
/* give it a proper name */
dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
dev_set_name(&rdev->wiphy.dev, "%s", nname);
mutex_unlock(&cfg80211_mutex);
mutex_init(&rdev->mtx);
mutex_init(&rdev->devlist_mtx);