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net80211: add IEEE80211_IS_LOCKED()

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When trying to sort out a teardown locking problem (downcall in the
driver can sleep) I found that the fan-out tree was getting too big
to fix net80211 locking per-se for this while working on entirely
different problems.
Add IEEE80211_IS_LOCKED() so the driver can check and un-/re-lock as
necessary (as we do in other cases already) to avoid panics on
debug kernels left and right.

Sponsored by:	The FreeBSD Foundation
Reviewed by:	adrian
Differential Revision: https://reviews.freebsd.org/D48475

(cherry picked from commit 054c5ddf587a7a0c430cf64dbf100b718eafdcc5)
This commit is contained in:
Bjoern A. Zeeb 2025-01-15 22:50:01 +00:00
parent 4d027e53be
commit 4eaf978df5
1 changed files with 2 additions and 0 deletions
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2
sys/net80211/ieee80211_freebsd.h
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@ -73,6 +73,8 @@ typedef struct {
mtx_assert(IEEE80211_LOCK_OBJ(_ic), MA_OWNED)
#define IEEE80211_UNLOCK_ASSERT(_ic) \
mtx_assert(IEEE80211_LOCK_OBJ(_ic), MA_NOTOWNED)
#define IEEE80211_IS_LOCKED(_ic) \
mtx_owned(IEEE80211_LOCK_OBJ(_ic))
/*
* Transmit lock.