msm: camera: jpeg: Add mutex lock to protect jpeg list corruption

Due to race conditions, situation can arise where the process_irq
and flush for jpeg are being handled in parallel. This will cause
the jpeg list corruption.
This commit protects the code of adding back to free list
in process_irq with the mutex.

CRs-Fixed: 2578247
Change-Id: I28ee48bc0d5cfcf3ae4a936b2eb2976226ad88d5
Signed-off-by: Gaurav Jindal <[email protected]>

drivers/cam_jpeg/jpeg_hw/cam_jpeg_hw_mgr.c

@@ -177,7 +177,9 @@ static int cam_jpeg_mgr_process_irq(void *priv, void *data)
 		PTR_TO_U64(p_cfg_req->hw_cfg_args.priv);
 	ctx_data->ctxt_event_cb(ctx_data->context_priv, 0, &buf_data);
 
+	mutex_lock(&g_jpeg_hw_mgr.hw_mgr_mutex);
 	list_add_tail(&p_cfg_req->list, &hw_mgr->free_req_list);
+	mutex_unlock(&g_jpeg_hw_mgr.hw_mgr_mutex);
 	return rc;
 }