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i915: wait for buffer idle before writing relocations 

When writing a relocation entry, make sure the target buffer is idle,
otherwise the GPU may see inconsistent data.
main
Keith Packard 2007-12-06 15:12:21 -08:00
parent 9ee511d786
commit 4ec8f58d04
1 changed files with 7 additions and 0 deletions
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7
shared-core/i915_dma.c
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@ -751,6 +751,13 @@ int i915_apply_reloc(struct drm_file *file_priv, int num_buffers,
!drm_bo_same_page(relocatee->offset, new_cmd_offset)) {
drm_bo_kunmap(&relocatee->kmap);
relocatee->offset = new_cmd_offset;
mutex_lock (&relocatee->buf->mutex);
ret = drm_bo_wait (relocatee->buf, 0, 0, FALSE);
mutex_unlock (&relocatee->buf->mutex);
if (ret) {
DRM_ERROR("Could not wait for buffer to apply relocs\n %08lx", new_cmd_offset);
return ret;
}
ret = drm_bo_kmap(relocatee->buf, new_cmd_offset >> PAGE_SHIFT,
1, &relocatee->kmap);
if (ret) {