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drm/radeon: signedness bug in kv_dpm.c 

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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dan Carpenter 2013-09-04 12:31:36 +03:00 committed by Alex Deucher
parent 41cd0b3b78
commit 8c5c6fad61
1 changed files with 13 additions and 19 deletions
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32
drivers/gpu/drm/radeon/kv_dpm.c
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@ -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;
}