False warning from Sparse

[Larry Finger]

Hi,

I am getting the following false warning from sparse:

  CHECK   drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c
drivers/net/wireless/rtlwifi/rtl8192c/dm_common.c:1158:13: warning: context 
imbalance in 'rtl92c_dm_refresh_rate_adaptive_mask' - different lock contexts 
for basic block

The only code in that routine that does any locking is the following:

             /* Only the PCI card uses sta in the update rate table
              * callback routine */
             if (rtlhal->interface == INTF_PCI) {
                     rcu_read_lock();
                     sta = ieee80211_find_sta(mac->vif, mac->bssid);
             }
             rtlpriv->cfg->ops->update_rate_tbl(hw, sta,
                                  p_ra->ratr_state);

             p_ra->pre_ratr_state = p_ra->ratr_state;
             if (rtlhal->interface == INTF_PCI)
                     rcu_read_unlock();

Does the warning get output because the code cannot assume that 
rtlhal->interface is the same in both if statements? If that is the case, are 
there any compiler directives that would tell sparse of the situation?

Thanks,

Larry
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