drm: Change first valid DRM drawable ID to be 1 instead of 0.

This makes it easier for userspace to know when it needs to allocate an ID.

Also free drawable information memory when it's no longer needed.

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 23 insertions, 12 deletions

diff --git a/drivers/char/drm/drm_drawable.c b/drivers/char/drm/drm_drawable.c
index 5580c5731eb8..ce7a027b0ad4 100644
--- a/drivers/char/drm/drm_drawable.c
+++ b/drivers/char/drm/drm_drawable.c
@@ -92,13 +92,13 @@ done:
                 bitfield[i] = 0;
         }
 
-        draw.handle = i * 8 * sizeof(*bitfield) + j;
+        draw.handle = i * 8 * sizeof(*bitfield) + j + 1;
         DRM_DEBUG("%d\n", draw.handle);
 
         spin_lock_irqsave(&dev->drw_lock, irqflags);
 
         bitfield[i] |= 1 << j;
-        info[draw.handle] = NULL;
+        info[draw.handle - 1] = NULL;
 
         if (bitfield != dev->drw_bitfield) {
                 memcpy(bitfield, dev->drw_bitfield, dev->drw_bitfield_length *
@@ -132,7 +132,7 @@ int drm_rmdraw(DRM_IOCTL_ARGS)
 {
         DRM_DEVICE;
         drm_draw_t draw;
-        unsigned int idx, shift;
+        unsigned int id, idx, shift;
         unsigned long irqflags;
         u32 *bitfield = dev->drw_bitfield;
         unsigned int bitfield_length = dev->drw_bitfield_length;
@@ -142,10 +142,11 @@ int drm_rmdraw(DRM_IOCTL_ARGS)
         DRM_COPY_FROM_USER_IOCTL(draw, (drm_draw_t __user *) data,
                                  sizeof(draw));
 
-        idx = draw.handle / (8 * sizeof(*bitfield));
-        shift = draw.handle % (8 * sizeof(*bitfield));
+        id = draw.handle - 1;
+        idx = id / (8 * sizeof(*bitfield));
+        shift = id % (8 * sizeof(*bitfield));
 
-        if (idx >= bitfield_length ||
+        if (idx < 0 || idx >= bitfield_length ||
             !(bitfield[idx] & (1 << shift))) {
                 DRM_DEBUG("No such drawable %d\n", draw.handle);
                 return 0;
@@ -157,6 +158,12 @@ int drm_rmdraw(DRM_IOCTL_ARGS)
 
         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
 
+        if (info[id]) {
+                drm_free(info[id]->rects, info[id]->num_rects *
+                         sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
+                drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
+        }
+
         /* Can we shrink the arrays? */
         if (idx == bitfield_length - 1) {
                 while (idx >= 0 && !bitfield[idx])
@@ -164,7 +171,7 @@ int drm_rmdraw(DRM_IOCTL_ARGS)
 
                 bitfield_length = idx + 1;
 
-                if (idx != draw.handle / (8 * sizeof(*bitfield)))
+                if (idx != id / (8 * sizeof(*bitfield)))
                         bitfield = drm_alloc(bitfield_length *
                                              sizeof(*bitfield), DRM_MEM_BUFS);
 
@@ -222,11 +229,12 @@ int drm_update_drawable_info(DRM_IOCTL_ARGS) {
         DRM_COPY_FROM_USER_IOCTL(update, (drm_update_draw_t __user *) data,
                                  sizeof(update));
 
-        id = update.handle;
+        id = update.handle - 1;
         idx = id / (8 * sizeof(*bitfield));
         shift = id % (8 * sizeof(*bitfield));
 
-        if (idx >= bitfield_length || !(bitfield[idx] & (1 << shift))) {
+        if (idx < 0 || idx >= bitfield_length ||
+            !(bitfield[idx] & (1 << shift))) {
                 DRM_ERROR("No such drawable %d\n", update.handle);
                 return DRM_ERR(EINVAL);
         }
@@ -304,10 +312,13 @@ error:
  */
 drm_drawable_info_t *drm_get_drawable_info(drm_device_t *dev, drm_drawable_t id) {
         u32 *bitfield = dev->drw_bitfield;
-        unsigned int idx = id / (8 * sizeof(*bitfield));
-        unsigned int shift = id % (8 * sizeof(*bitfield));
+        unsigned int idx, shift;
+
+        id--;
+        idx = id / (8 * sizeof(*bitfield));
+        shift = id % (8 * sizeof(*bitfield));
 
-        if (idx >= dev->drw_bitfield_length ||
+        if (idx < 0 || idx >= dev->drw_bitfield_length ||
             !(bitfield[idx] & (1 << shift))) {
                 DRM_DEBUG("No such drawable %d\n", id);
                 return NULL;