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wifi: rtlwifi: add calculate_bit_shift()

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[ Upstream commit 52221dfddbbfb5b4e029bb2efe9bb7da33ec1e46 ]

There are many same functions like _rtl88e_phy_calculate_bit_shift(),
_rtl92c_phy_calculate_bit_shift() and so on. And these functions can
cause undefined bitwise shift behavior. Add calculate_bit_shift() to
replace them and fix undefined behavior in subsequent patches.

Signed-off-by: Su Hui <suhui@nfschina.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20231219065739.1895666-2-suhui@nfschina.com
Stable-dep-of: 969bc926f04b ("wifi: rtlwifi: rtl8188ee: phy: using calculate_bit_shift()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Su Hui 2023-12-19 14:57:29 +08:00 committed by Greg Kroah-Hartman
parent 4985e507e0
commit 7cbcf5fe01
1 changed files with 7 additions and 0 deletions
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7
drivers/net/wireless/realtek/rtlwifi/wifi.h
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@ -3230,4 +3230,11 @@ static inline struct ieee80211_sta *rtl_find_sta(struct ieee80211_hw *hw,
return ieee80211_find_sta(mac->vif, mac_addr);
}
static inline u32 calculate_bit_shift(u32 bitmask)
{
if (WARN_ON_ONCE(!bitmask))
return 0;
return __ffs(bitmask);
}
#endif