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

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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

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4

drivers/net/wireless/realtek/rtw88/main.c

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2

drivers/net/wireless/realtek/rtw88/main.h

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