Thanks, please help to review the attached patch.
Best Regards
Rex
-----Original Message-----
From: Dan Carpenter [mailto:dan.carpenter@xxxxxxxxxx]
Sent: Thursday, October 13, 2016 9:26 PM
To: Zhu, Rex
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: [bug report] drm/amd/powerplay: add vce state tables initialize for ppt v1.
Hello Rex Zhu,
The patch 48d7b759a8bc: "drm/amd/powerplay: add vce state tables initialize for ppt v1." from Aug 31, 2016, leads to the following static checker warning:
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/process_pptables_v1_0.c:1211 ppt_get_num_of_vce_state_table_entries_v1_0()
warn: 'vce_state_table' can't be NULL.
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/process_pptables_v1_0.c
1200
1201 static int ppt_get_num_of_vce_state_table_entries_v1_0(struct pp_hwmgr *hwmgr)
1202 {
1203 const ATOM_Tonga_POWERPLAYTABLE *pp_table = get_powerplay_table(hwmgr);
1204 const ATOM_Tonga_VCE_State_Table *vce_state_table =
1205 (ATOM_Tonga_VCE_State_Table *)(((unsigned long)pp_table) + le16_to_cpu(pp_table->usVCEStateTableOffset));
^^^^^^^^ pp_table can't be NULL because we're dereferencing it here. That means vce_state_table can't be NULL either.
1206
1207 if (vce_state_table == NULL)
1208 return 0;
1209
1210 return vce_state_table->ucNumEntries;
1211 }
1212
A cleaner way to write this is maybe:
static int ppt_get_num_of_vce_state_table_entries_v1_0(struct pp_hwmgr *hwmgr) {
const ATOM_Tonga_POWERPLAYTABLE *pp_table = get_powerplay_table(hwmgr);
const ATOM_Tonga_VCE_State_Table *vce_state_table;
if (!pp_table)
return 0;
vce_state_table = (void *)pp_table + le16_to_cpu(pp_table->usVCEStateTableOffset);
return vce_state_table->ucNumEntries;
}
regards,
dan carpenter
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