[v2,0/2] Add lock to avoid race when ringing channel DB

Message

Qiang Yu Sept. 13, 2023, 8:47 a.m. UTC

1. We need a write lock in mhi_gen_tre otherwise there is race of the WP
used for ringing channel DB between mhi_queue and M0 transition.
2. We can not invoke local_bh_enable() when irqs are disabled, so move
read_lock_irqsave() under the mhi_gen_tre() since we add write_lock_bh() in
mhi_gen_tre().

v1 -> v2:
Added write_unlock_bh(&mhi_chan->lock) in mhi_gen_tre() before return
because of error process.

Bhaumik Bhatt (1):
  bus: mhi: host: Add spinlock to protect WP access when queueing TREs

Hemant Kumar (1):
  bus: mhi: host: Take irqsave lock after TRE is generated

 drivers/bus/mhi/host/main.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)