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msm: mhi_dev: Adding check for event ring

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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>
This commit is contained in:
Sai Chaitanya Kaveti 2022-02-08 15:43:54 +05:30
commit 3f0d27aba2
1 changed files with 5 additions and 0 deletions
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5
drivers/platform/msm/mhi_dev/mhi.c
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@ -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) {