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.carpen...@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;
}
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