RE: [bug report] drm/amd/powerplay: add point check to avoid NULL point hang.

["Quan, Evan" <Evan.Quan@xxxxxxx>]

[AMD Official Use Only - Internal Distribution Only]

Thanks. I just sent out a patch to address this.

BR
Evan
-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Dan Carpenter
Sent: Tuesday, August 25, 2020 6:24 PM
To: Rex.Zhu@xxxxxxx
Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: [bug report] drm/amd/powerplay: add point check to avoid NULL point hang.

Hello Rex Zhu,

The patch 88b8dcbe21fd: "drm/amd/powerplay: add point check to avoid NULL point hang." from Dec 11, 2015, leads to the following static checker warning:

drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/hardwaremanager.c:274 phm_check_smc_update_required_for_display_configuration()
warn: signedness bug returning '(-22)'

drivers/gpu/drm/amd/amdgpu/../pm/powerplay/hwmgr/hardwaremanager.c
   272  bool phm_check_smc_update_required_for_display_configuration(struct pp_hwmgr *hwmgr)
   273  {
   274          PHM_FUNC_CHECK(hwmgr);

PHM_FUNC_CHECK() has a hiddren -EINVAL return that becomes true when casted to bool.

   275          if (hwmgr->pp_one_vf)
   276                  return false;
   277
   278          if (hwmgr->hwmgr_func->check_smc_update_required_for_display_configuration == NULL)
   279                  return false;
   280
   281          return hwmgr->hwmgr_func->check_smc_update_required_for_display_configuration(hwmgr);
   282  }

regards,
dan carpenter
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