mhi_queue returns an error when the doorbell is not accessible in
the current state. This can happen when the device is in non M0
state, like M3, and needs to be waken-up prior ringing the DB. this
case is manager earlier by triggering an asynchronous M3 exit via
controller resume/suspend callbacks, that in turn will cause M0
transition and DB update.
So, since it's not an error but just delaying of doorbell update do not
return an error.
That also fix a use after free error for skb case, indeed a caller
queuing skb will try to free the skb if the queueing fails, but in
that case queueing has been done.
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
---
drivers/bus/mhi/core/main.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 7fc2482..c780234 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -1031,12 +1031,8 @@ static int mhi_queue(struct mhi_device *mhi_dev, struct mhi_buf_info *buf_info,
if (mhi_chan->dir == DMA_TO_DEVICE)
atomic_inc(&mhi_cntrl->pending_pkts);
- if (unlikely(!MHI_DB_ACCESS_VALID(mhi_cntrl))) {
- ret = -EIO;
- goto exit_unlock;
- }
-
- mhi_ring_chan_db(mhi_cntrl, mhi_chan);
+ if (likely(MHI_DB_ACCESS_VALID(mhi_cntrl)))
+ mhi_ring_chan_db(mhi_cntrl, mhi_chan);
exit_unlock:
read_unlock_irqrestore(&mhi_cntrl->pm_lock, flags);
--
2.7.4
