rtlwifi: Use mutex to replace spin_lock to protect IPS and LPS
Enter/leavel IPS and LPS are large critical section, and they can't use sleep function because running in atomic-context, which own a spin_lock. In commit ba9f93f8 ("rtlwifi: Fix enter/exit power_save"), it moves LPS functions to thread-context, so this commit can simply change LPS's spin lock to mutex. Considering IPS functions, rtl_ips_nic_on() may be called by TX tasklet (softirq-context) that check whether packet is auth frame. Fortunately, current mac80211 will ask driver to leave IPS using op_config with changed flag IEEE80211_CONF_CHANGE_IDLE, before issuing auth frame, so IPS functions can run in thread-context and use mutex to protect critical section, too. Also, this commit removes some useless spin locks. Signed-off-by: NPing-Ke Shih <pkshih@realtek.com> Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
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