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wifi: rtw88: fix DTIM period handling when conf->dtim_period is zero

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The function rtw_set_dtim_period() accepted an 'int' dtim_period parameter,
while mac80211 provides dtim_period as 'u8' in struct ieee80211_bss_conf.
In IBSS (ad-hoc) mode mac80211 may set dtim_period to 0.

The driver unconditionally wrote (dtim_period - 1) to
REG_DTIM_COUNTER_ROOT, which resulted in 0xFF when dtim_period was 0. This
caused delays in broadcast/multicast traffic processing and issues with
ad-hoc operation.

Convert the function parameter to u8 to match ieee80211_bss_conf and avoid
the underflow by writing 0 when dtim_period is 0.

Link: https://github.com/lwfinger/rtw88/issues/406
Signed-off-by: Roman Peshkichev <roman.peshkichev@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20251125180937.22977-1-roman.peshkichev@gmail.com
This commit is contained in:
Roman Peshkichev 2025-11-25 23:09:37 +05:00 committed by Ping-Ke Shih
parent 8f7aa3d3c7
commit 9f68fdcdc9
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/wireless/realtek/rtw88/main.c
View File

@ -730,10 +730,10 @@ void rtw_set_rx_freq_band(struct rtw_rx_pkt_stat *pkt_stat, u8 channel)
}
EXPORT_SYMBOL(rtw_set_rx_freq_band);
void rtw_set_dtim_period(struct rtw_dev *rtwdev, int dtim_period)
void rtw_set_dtim_period(struct rtw_dev *rtwdev, u8 dtim_period)
{
rtw_write32_set(rtwdev, REG_TCR, BIT_TCR_UPDATE_TIMIE);
rtw_write8(rtwdev, REG_DTIM_COUNTER_ROOT, dtim_period - 1);
rtw_write8(rtwdev, REG_DTIM_COUNTER_ROOT, dtim_period ? dtim_period - 1 : 0);
}
void rtw_update_channel(struct rtw_dev *rtwdev, u8 center_channel,

2
drivers/net/wireless/realtek/rtw88/main.h
View File

@ -2226,7 +2226,7 @@ enum nl80211_band rtw_hw_to_nl80211_band(enum rtw_supported_band hw_band)
}
void rtw_set_rx_freq_band(struct rtw_rx_pkt_stat *pkt_stat, u8 channel);
void rtw_set_dtim_period(struct rtw_dev *rtwdev, int dtim_period);
void rtw_set_dtim_period(struct rtw_dev *rtwdev, u8 dtim_period);
void rtw_get_channel_params(struct cfg80211_chan_def *chandef,
struct rtw_channel_params *ch_param);
bool check_hw_ready(struct rtw_dev *rtwdev, u32 addr, u32 mask, u32 target);