lkml.org 
[lkml]   [2023]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V2] bus: mhi: host: Avoid ringing EV DB if there is no elements to process
Date
Avoid ringing Event DB if there is no elements to process.
As mhi_poll function can be called by mhi client drivers
which will call process_event, which will ring DB even if
there no ring elements to process.

Signed-off-by: Vivek Pernamitta <quic_vpernami@quicinc.com>
---
drivers/bus/mhi/host/main.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index df0fbfe..0311a31 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -961,7 +961,7 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl,
}

read_lock_bh(&mhi_cntrl->pm_lock);
- if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl)))
+ if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl)) && count)
mhi_ring_er_db(mhi_event);
read_unlock_bh(&mhi_cntrl->pm_lock);

@@ -1031,7 +1031,9 @@ int mhi_process_data_event_ring(struct mhi_controller *mhi_cntrl,
count++;
}
read_lock_bh(&mhi_cntrl->pm_lock);
- if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl)))
+
+ /* Ring EV DB only if there is any pending element to process */
+ if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl)) && count)
mhi_ring_er_db(mhi_event);
read_unlock_bh(&mhi_cntrl->pm_lock);

--
2.7.4
\
 
 \ /
  Last update: 2023-03-27 00:32    [W:0.059 / U:0.584 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site