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iwlegacy: fix bugs in change_interface 

If change_interface gets invoked during a firmware
restart, it may crash; prevent that from happening
by checking if ctx->vif is assigned.

Additionally, in my initial commit I forgot to set
the vif->p2p variable correctly, so fix that too.

Cc: stable@kernel.org [2.6.38+]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-03-29 15:28:11 +02:00 committed by John W. Linville
parent 24047e2c4f
commit ffd8c746fb
1 changed files with 10 additions and 0 deletions
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10
drivers/net/wireless/iwlegacy/iwl-core.c
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@ -1805,6 +1805,15 @@ iwl_legacy_mac_change_interface(struct ieee80211_hw *hw,
mutex_lock(&priv->mutex);
if (!ctx->vif || !iwl_legacy_is_ready_rf(priv)) {
/*
* Huh? But wait ... this can maybe happen when
* we're in the middle of a firmware restart!
*/
err = -EBUSY;
goto out;
}
interface_modes = ctx->interface_modes | ctx->exclusive_interface_modes;
if (!(interface_modes & BIT(newtype))) {
@ -1832,6 +1841,7 @@ iwl_legacy_mac_change_interface(struct ieee80211_hw *hw,
/* success */
iwl_legacy_teardown_interface(priv, vif, true);
vif->type = newtype;
vif->p2p = newp2p;
err = iwl_legacy_setup_interface(priv, ctx);
WARN_ON(err);
/*