The Dell AIO machines released after 2017 come with a UART interface
to communicate with the backlight scalar board. This driver creates
a standard backlight interface and talks to the scalar board through
UART.
Some platform(BIOS) blocks legacy interrupts (INTx), and only allows MSI
for WLAN device. So adding a quirk to list those machines and set
use_msi automatically.
Adding Dell Inspiron 24-3460 to the quirk.
On new Intel platforms like ApolloLake, legacy interrupt mechanism
(INTx) is not supported, so WLAN modules are not working because
interrupts are missing, therefore this patch is to add MSI support to
ath9k. With module paremeter "use_msi=1", ath9k driver would try to
use MSI instead of INTx.
When an RX BA session is started by the driver, and it has to tell
mac80211 about it, the corresponding bit in tid_rx_manage_offl gets
set and the BA session work is scheduled. Upon testing this bit, it
will call __ieee80211_start_rx_ba_session(), thus deadlocking as it
already holds the ampdu_mlme.mtx, which that acquires again.
Fix this by adding ___ieee80211_start_rx_ba_session(), a version of
the function that requires the mutex already held.
Cc: <email address hidden>
Fixes: 699cb58c8a52 ("mac80211: manage RX BA session offload without SKB queue")
Reported-by: Matteo Croce <email address hidden>
Signed-off-by: Johannes Berg <email address hidden>
(cherry picked from commit bde59c475e0883e4c4294bcd9b9c7e08ae18c828)
Signed-off-by: AceLan Kao <email address hidden>
