drm/radeon: gcc fixes for ni 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>

diff --git a/drivers/gpu/drm/radeon/ni_dpm.c b/drivers/gpu/drm/radeon/ni_dpm.c
index 238078c2b31947a70f8622c6eb73ea4acc27ed9d..88aa41e341afaac784348b5697aaece35c9ea8dd 100644 (file)
--- a/drivers/gpu/drm/radeon/ni_dpm.c
+++ b/drivers/gpu/drm/radeon/ni_dpm.c
@@ -4038,6 +4038,7 @@ static int ni_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 ni_ps), GFP_KERNEL);
                        if (ps == NULL) {
                                kfree(rdev->pm.dpm.ps);
@@ -4047,12 +4048,12 @@ static int ni_parse_power_table(struct radeon_device *rdev)
                        ni_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));
                                ni_parse_pplib_clock_info(rdev,
                                                          &rdev->pm.dpm.ps[i], j,
                                                          clock_info);