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iwlwifi: mvm: wait for d0i3 exit on hw restart

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On hw restart, make sure to wait for d0i3 exit
(by checking the IN_D0I3 status bit).

This is needed in order to avoid the stale
d0i3_exit_work from doing harm (e.g. unref
cleared reference).

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Eliad Peller 2014-12-11 10:48:18 +02:00 committed by Emmanuel Grumbach
parent b0677f7133
commit 37948fcfd0
1 changed files with 13 additions and 0 deletions
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13
drivers/net/wireless/iwlwifi/mvm/mac80211.c
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@ -972,6 +972,19 @@ static int iwl_mvm_mac_start(struct ieee80211_hw *hw)
struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
int ret;
/* Some hw restart cleanups must not hold the mutex */
if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
/*
* Make sure we are out of d0i3. This is needed
* to make sure the reference accounting is correct
* (and there is no stale d0i3_exit_work).
*/
wait_event_timeout(mvm->d0i3_exit_waitq,
!test_bit(IWL_MVM_STATUS_IN_D0I3,
&mvm->status),
HZ);
}
mutex_lock(&mvm->mutex);
ret = __iwl_mvm_mac_start(mvm);
mutex_unlock(&mvm->mutex);