[bug report] drm/msm/dsi: Move PHY operations out of host

[Dan Carpenter]

Hello Hai Li,

This is a semi-automatic email about new static checker warnings.

The patch b62aa70a98c5: "drm/msm/dsi: Move PHY operations out of 
host" from Jan 7, 2017, leads to the following Smatch complaint:

./drivers/gpu/drm/msm/dsi/dsi_manager.c:174 dsi_mgr_phy_enable()
	 error: we previously assumed 'mdsi' could be null (see line 157)

./drivers/gpu/drm/msm/dsi/dsi_manager.c
   156		 */
   157		if (IS_DUAL_DSI() && mdsi && sdsi) {
                                     ^^^^
Check for NULL.

   158			if (!mdsi->phy_enabled && !sdsi->phy_enabled) {
   159				msm_dsi_host_reset_phy(mdsi->host);
   160				msm_dsi_host_reset_phy(sdsi->host);
   161	
   162				ret = enable_phy(mdsi, src_pll_id,
   163						 &shared_timings[DSI_CLOCK_MASTER]);
   164				if (ret)
   165					return ret;
   166				ret = enable_phy(sdsi, src_pll_id,
   167						 &shared_timings[DSI_CLOCK_SLAVE]);
   168				if (ret) {
   169					msm_dsi_phy_disable(mdsi->phy);
   170					return ret;
   171				}
   172			}
   173		} else {
   174			msm_dsi_host_reset_phy(mdsi->host);
                                               ^^^^^^^^^^
Unchecked dereference.

   175			ret = enable_phy(msm_dsi, src_pll_id, &shared_timings[id]);
   176			if (ret)

regards,
dan carpenter