[PATCH i-g-t 2/7] lib: Document that gem_mmap__{cpu, gtt, wc} return NULL on failure

[ville.syrjala@xxxxxxxxxxxxxxx]

From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 lib/ioctl_wrappers.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 80e1ec6..eb745bc 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -456,7 +456,7 @@ void gem_execbuf(int fd, struct drm_i915_gem_execbuffer2 *execbuf)
  * This functions wraps up procedure to establish a memory mapping through the
  * GTT.
  *
- * Returns: A pointer to the created memory mapping.
+ * Returns: A pointer to the created memory mapping, NULL on failure.
  */
 void *gem_mmap__gtt(int fd, uint32_t handle, uint64_t size, unsigned prot)
 {
@@ -535,7 +535,7 @@ bool gem_mmap__has_wc(int fd)
  * bypassing the GTT system agent (i.e. there is no automatic tiling of
  * the mmapping through the fence registers).
  *
- * Returns: A pointer to the created memory mapping.
+ * Returns: A pointer to the created memory mapping, NULL on failure.
  */
 void *gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot)
 {
@@ -569,7 +569,7 @@ void *gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsi
  * This functions wraps up procedure to establish a memory mapping through
  * direct cpu access, bypassing the gpu completely.
  *
- * Returns: A pointer to the created memory mapping.
+ * Returns: A pointer to the created memory mapping, NULL on failure.
  */
 void *gem_mmap__cpu(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot)
 {
-- 
2.4.9

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