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path: root/drivers/gpu/drm/radeon/radeon_kms.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_kms.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_kms.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 948a2f454e4..b1c8ace5f08 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -162,13 +162,27 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
return -EINVAL;
}
case RADEON_INFO_WANT_HYPERZ:
+ /* The "value" here is both an input and output parameter.
+ * If the input value is 1, filp requests hyper-z access.
+ * If the input value is 0, filp revokes its hyper-z access.
+ *
+ * When returning, the value is 1 if filp owns hyper-z access,
+ * 0 otherwise. */
+ if (value >= 2) {
+ DRM_DEBUG_KMS("WANT_HYPERZ: invalid value %d\n", value);
+ return -EINVAL;
+ }
mutex_lock(&dev->struct_mutex);
- if (rdev->hyperz_filp)
- value = 0;
- else {
- rdev->hyperz_filp = filp;
- value = 1;
+ if (value == 1) {
+ /* wants hyper-z */
+ if (!rdev->hyperz_filp)
+ rdev->hyperz_filp = filp;
+ } else if (value == 0) {
+ /* revokes hyper-z */
+ if (rdev->hyperz_filp == filp)
+ rdev->hyperz_filp = NULL;
}
+ value = rdev->hyperz_filp == filp ? 1 : 0;
mutex_unlock(&dev->struct_mutex);
break;
default: