diff mbox series

bus: mhi: host: Disable preemption while processing data events

Message ID 1667462111-55496-1-git-send-email-quic_qianyu@quicinc.com
State New
Headers show
Series bus: mhi: host: Disable preemption while processing data events | expand

Commit Message

Qiang Yu Nov. 3, 2022, 7:55 a.m. UTC 
If data processing of an event is scheduled out because core
is busy handling multiple irqs, this can starves the processing
of MHI M0 state change event on another core. Fix this issue by
disabling irq on the core processing data events.

Signed-off-by: Qiang Yu <quic_qianyu@quicinc.com>
---
 drivers/bus/mhi/host/main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index f3aef77a..b58698d 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -1027,13 +1027,14 @@  int mhi_process_data_event_ring(struct mhi_controller *mhi_cntrl,
 
 void mhi_ev_task(unsigned long data)
 {
+	unsigned long flags;
 	struct mhi_event *mhi_event = (struct mhi_event *)data;
 	struct mhi_controller *mhi_cntrl = mhi_event->mhi_cntrl;
 
 	/* process all pending events */
-	spin_lock_bh(&mhi_event->lock);
+	spin_lock_irqsave(&mhi_event->lock, flags);
 	mhi_event->process_event(mhi_cntrl, mhi_event, U32_MAX);
-	spin_unlock_bh(&mhi_event->lock);
+	spin_unlock_irqrestore(&mhi_event->lock, flags);
 }
 
 void mhi_ctrl_ev_task(unsigned long data)