False warning from Sparse

From: Larry Finger
Date: Sat Jul 21 2012 - 23:53:43 EST


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) {
sta = ieee80211_find_sta(mac->vif, mac->bssid);
rtlpriv->cfg->ops->update_rate_tbl(hw, sta,

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

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?


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