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msm: mhi_dev: Don't process any other interrupts during M0 processing

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M0 (mhi resume) processing and doorbell interrupt processing are done
in different contexts. And there can be a chance that DB processing
can proceed even before the resume is completely done.

Say while processing M0, MHI has issued M0-ack but not updated channel
state to running state for *all* channels yet. The host can start ringing
DB the moment it sees M0-ack and it's the channel is in running state.

To avoid this race condition, ensure MHI doesn't process any CHDB
interrupt until it's completely done with the resume.

Change-Id: Ie8f7fec034be6b17c71e3b7437ab8e6effb63365
Signed-off-by: Veerabhadrarao Badiganti <quic_vbadigan@quicinc.com>
This commit is contained in:
Veerabhadrarao Badiganti 2021-11-24 14:19:07 +05:30
commit 570829fbc1
1 changed files with 11 additions and 0 deletions
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11
drivers/platform/msm/mhi_dev/mhi_sm.c
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@ -1338,6 +1338,17 @@ int mhi_dev_notify_sm_event(enum mhi_dev_event event)
INIT_WORK(&state_change_event->work, mhi_sm_dev_event_manager);
atomic_inc(&mhi_sm_ctx->pending_device_events);
queue_work(mhi_sm_ctx->mhi_sm_wq, &state_change_event->work);
/*
* Wait until M0 processing is completely done.
* This ensures CHDB won't get processed while resume is in
* progress thus avoids race between M0 and CHDB processing.
*/
if (event == MHI_DEV_EVENT_M0_STATE) {
MHI_SM_DBG("Got M0, wait until resume is done\n");
flush_workqueue(mhi_sm_ctx->mhi_sm_wq);
}
res = 0;
exit: