From 1551019523a01f477888835b9ed363d3a2e73d7b Mon Sep 17 00:00:00 2001 From: Eric Huang Date: Fri, 15 Apr 2016 15:02:54 -0400 Subject: [PATCH] drm/amd/powerplay: revise caching the soft pptable and add it's size This fixes a bug in the pptable access interface that could lead to a crash. Check the pointer before using it. Reviewed-by: Alex Deucher Signed-off-by: Eric Huang Signed-off-by: Alex Deucher --- .../amd/powerplay/hwmgr/tonga_processpptables.c | 15 +++++++++------ drivers/gpu/drm/amd/powerplay/inc/hwmgr.h | 1 + 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_processpptables.c b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_processpptables.c index 96a27876a704..10e3630ee39d 100644 --- a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_processpptables.c +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_processpptables.c @@ -138,12 +138,15 @@ const void *get_powerplay_table(struct pp_hwmgr *hwmgr) u16 size; u8 frev, crev; - void *table_address; - - table_address = (ATOM_Tonga_POWERPLAYTABLE *) - cgs_atom_get_data_table(hwmgr->device, index, &size, &frev, &crev); - - hwmgr->soft_pp_table = table_address; /*Cache the result in RAM.*/ + void *table_address = (void *)hwmgr->soft_pp_table; + + if (!table_address) { + table_address = (ATOM_Tonga_POWERPLAYTABLE *) + cgs_atom_get_data_table(hwmgr->device, + index, &size, &frev, &crev); + hwmgr->soft_pp_table = table_address; /*Cache the result in RAM.*/ + hwmgr->soft_pp_table_size = size; + } return table_address; } diff --git a/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h b/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h index b1a9ae509ed8..c96e5b1baae0 100644 --- a/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h +++ b/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h @@ -577,6 +577,7 @@ struct pp_hwmgr { void *device; struct pp_smumgr *smumgr; const void *soft_pp_table; + uint32_t soft_pp_table_size; bool need_pp_table_upload; enum amd_dpm_forced_level dpm_level; bool block_hw_access; -- 2.20.1