The problem here is that "unsigned i" is always greater than or equal to zero. These loops mostly have a second check for "(i == 0)" so only the last two are actually buggy. The rest is just cleanup.
Bug 1: kv_force_dpm_highest() doesn't have an "(i == 0)" check so it's a potential forever loop.
Bug 2: In kv_get_sleep_divider_id_from_clock() there is a typo and the test is reversed "<=" vs ">" so we never enter the loop. That means normally we return KV_MAX_DEEPSLEEP_DIVIDER_ID (5). The return value from here is saved in ->DeepSleepDivId and I wasn't able to determine how that is used. This is a static checker fix and I have not tested it.
Signed-off-by: Dan Carpenter dan.carpenter@oracle.com --- I considered making "i" signed but that doesn't actually change anything because the tests have to end on zero anyway.
diff --git a/drivers/gpu/drm/radeon/kv_dpm.c b/drivers/gpu/drm/radeon/kv_dpm.c index ecd6080..c499daf 100644 --- a/drivers/gpu/drm/radeon/kv_dpm.c +++ b/drivers/gpu/drm/radeon/kv_dpm.c @@ -667,9 +667,8 @@ static int kv_program_bootup_state(struct radeon_device *rdev) &rdev->pm.dpm.dyn_state.vddc_dependency_on_sclk;
if (table && table->count) { - for (i = pi->graphics_dpm_level_count - 1; i >= 0; i--) { - if ((table->entries[i].clk == pi->boot_pl.sclk) || - (i == 0)) + for (i = pi->graphics_dpm_level_count - 1; i > 0; i--) { + if (table->entries[i].clk == pi->boot_pl.sclk) break; }
@@ -682,9 +681,8 @@ static int kv_program_bootup_state(struct radeon_device *rdev) if (table->num_max_dpm_entries == 0) return -EINVAL;
- for (i = pi->graphics_dpm_level_count - 1; i >= 0; i--) { - if ((table->entries[i].sclk_frequency == pi->boot_pl.sclk) || - (i == 0)) + for (i = pi->graphics_dpm_level_count - 1; i > 0; i--) { + if (table->entries[i].sclk_frequency == pi->boot_pl.sclk) break; }
@@ -1588,13 +1586,11 @@ static void kv_set_valid_clock_range(struct radeon_device *rdev, } }
- for (i = pi->graphics_dpm_level_count - 1; i >= 0; i--) { - if ((table->entries[i].clk <= new_ps->levels[new_ps->num_levels -1].sclk) || - (i == 0)) { - pi->highest_valid = i; + for (i = pi->graphics_dpm_level_count - 1; i > 0; i--) { + if (table->entries[i].clk <= new_ps->levels[new_ps->num_levels - 1].sclk) break; - } } + pi->highest_valid = i;
if (pi->lowest_valid > pi->highest_valid) { if ((new_ps->levels[0].sclk - table->entries[pi->highest_valid].clk) > @@ -1615,14 +1611,12 @@ static void kv_set_valid_clock_range(struct radeon_device *rdev, } }
- for (i = pi->graphics_dpm_level_count - 1; i >= 0; i--) { + for (i = pi->graphics_dpm_level_count - 1; i > 0; i--) { if (table->entries[i].sclk_frequency <= - new_ps->levels[new_ps->num_levels - 1].sclk || - i == 0) { - pi->highest_valid = i; + new_ps->levels[new_ps->num_levels - 1].sclk) break; - } } + pi->highest_valid = i;
if (pi->lowest_valid > pi->highest_valid) { if ((new_ps->levels[0].sclk - @@ -1871,7 +1865,7 @@ static int kv_force_dpm_highest(struct radeon_device *rdev) if (ret) return ret;
- for (i = SMU7_MAX_LEVELS_GRAPHICS - 1; i >= 0; i--) { + for (i = SMU7_MAX_LEVELS_GRAPHICS - 1; i > 0; i--) { if (enable_mask & (1 << i)) break; } @@ -1911,9 +1905,9 @@ static u8 kv_get_sleep_divider_id_from_clock(struct radeon_device *rdev, if (!pi->caps_sclk_ds) return 0;
- for (i = KV_MAX_DEEPSLEEP_DIVIDER_ID; i <= 0; i--) { + for (i = KV_MAX_DEEPSLEEP_DIVIDER_ID; i > 0; i--) { temp = sclk / sumo_get_sleep_divider_from_id(i); - if ((temp >= min) || (i == 0)) + if (temp >= min) break; }