drm/radeonn: gcc fixes for rv7xx/eg/btc dpm

Newer versions of gcc seem to wander off into the
weeds when dealing with variable sizes arrays in
structs.  Rather than indexing the arrays, use
pointer arithmetic.

See bugs:
https://bugs.freedesktop.org/show_bug.cgi?id=66932
https://bugs.freedesktop.org/show_bug.cgi?id=66972
https://bugs.freedesktop.org/show_bug.cgi?id=66945

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/rv770_dpm.c b/drivers/gpu/drm/radeon/rv770_dpm.c
index 44c1e782a696..8cbb85dae5aa 100644
--- a/drivers/gpu/drm/radeon/rv770_dpm.c
+++ b/drivers/gpu/drm/radeon/rv770_dpm.c
@@ -2294,6 +2294,7 @@ int rv7xx_parse_power_table(struct radeon_device *rdev)
                          (power_state->v1.ucNonClockStateIndex *
                           power_info->pplib.ucNonClockSize));
                 if (power_info->pplib.ucStateEntrySize - 1) {
+                        u8 *idx;
                         ps = kzalloc(sizeof(struct rv7xx_ps), GFP_KERNEL);
                         if (ps == NULL) {
                                 kfree(rdev->pm.dpm.ps);
@@ -2303,12 +2304,12 @@ int rv7xx_parse_power_table(struct radeon_device *rdev)
                         rv7xx_parse_pplib_non_clock_info(rdev, &rdev->pm.dpm.ps[i],
                                                          non_clock_info,
                                                          power_info->pplib.ucNonClockSize);
+                        idx = (u8 *)&power_state->v1.ucClockStateIndices[0];
                         for (j = 0; j < (power_info->pplib.ucStateEntrySize - 1); j++) {
                                 clock_info = (union pplib_clock_info *)
                                         (mode_info->atom_context->bios + data_offset +
                                          le16_to_cpu(power_info->pplib.usClockInfoArrayOffset) +
-                                         (power_state->v1.ucClockStateIndices[j] *
-                                          power_info->pplib.ucClockInfoSize));
+                                         (idx[j] * power_info->pplib.ucClockInfoSize));
                                 rv7xx_parse_pplib_clock_info(rdev,
                                                              &rdev->pm.dpm.ps[i], j,
                                                              clock_info);