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Merge "msm: camera: reqmgr: check link state before taking mutex" into camera-kernel.lnx.4.0

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Camera Software Integration 2021-07-14 10:32:55 -07:00 • committed by Gerrit - the friendly Code Review server
commit 8a5becb04e
1 changed files with 13 additions and 0 deletions
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13
drivers/cam_req_mgr/cam_req_mgr_core.c
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@ -1714,6 +1714,19 @@ static int __cam_req_mgr_process_req(struct cam_req_mgr_core_link *link,
return -EINVAL;
}
/*
* In case if the wq is scheduled while destroying session
* the session mutex is already taken and will cause a
* dead lock. To avoid further processing check link state
* and exit.
*/
spin_lock_bh(&link->link_state_spin_lock);
if (link->state == CAM_CRM_LINK_STATE_IDLE) {
spin_unlock_bh(&link->link_state_spin_lock);
return -EPERM;
}
spin_unlock_bh(&link->link_state_spin_lock);
mutex_lock(&session->lock);
in_q = link->req.in_q;
/*