Commit 3f0d27ab authored Feb 08, 2022 by Sai Chaitanya Kaveti

msm: mhi_dev: Adding check for event ring



During the initialization, device waits for M0 state. Ring structures are
not yet allocated at this point. While waiting if device receives a D3cold
or D3hot event, device enters the sys err state. At the end of sys err
handling it acceses the event ring in mhi_dev_send_multiple_tr_events API
which is causing device crash.

Adding check for event ring in send multiple tr events API to fail
it if ring is not present.

Change-Id: Iffe44107c1925e0cccb38651aa09ba1f893f1014
Signed-off-by: Sai Chaitanya Kaveti <quic_skaveti@quicinc.com>

parent d4f2423d

drivers/platform/msm/mhi_dev/mhi.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -466,6 +466,11 @@ static int mhi_dev_send_multiple_tr_events(struct mhi_dev *mhi, int evnt_ring,
		return -EINVAL;
		}

		if (!ring) {
		pr_err("%s(): Ring %d not present\n", __func__, evnt_ring_idx);
		return -EINVAL;
		}

		ctx = (union mhi_dev_ring_ctx *)&mhi->ev_ctx_cache[evnt_ring];

		if (mhi_ring_get_state(ring) == RING_STATE_UINT) {