Q: offchannel operations

[Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>]

Hi,

There are 2 similar operations in the struct cfg80211_ops:
remain_on_channel() and mgmt_tx(). Actually, mgmt_tx() when called for
off-channel operation, is the same as remain_on_channel() except it
transmits frame at the beginning.

What I am interesting about, is notifications to cfg80211. For
remain_on_channel(), there are 2: cfg80211_ready_on_channel() when
channel tuned, and cfg80211_remain_on_channel_expired() when tuned off
requested channel. In contrast, if mgmt_tx() called for off-channel
with duration, 2 above notifications are not used. Instead, only
cfg80211_mgmt_tx_status() called after tx.

My question is why don't mgmt_tx() call cfg80211_ready_on_channel() and
cfg80211_remain_on_channel_expired() ? It seems logical to notify about
off-channel status. Otherwise, how can upper layers know when off-channel
started/finished in context of mgmt_tx()?

Comments?

Thanks, Vladimir