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lib: Document that gem_mmap__{cpu,gtt,wc} return NULL on failure

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Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Stochastically-reviwewed-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Ville Syrjälä 2015-10-09 16:59:13 +03:00
parent 9792e7b580
commit 8986bbc0ce
1 changed files with 3 additions and 3 deletions
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6
lib/ioctl_wrappers.c
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@ -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 * This functions wraps up procedure to establish a memory mapping through the
* GTT. * 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) 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 * bypassing the GTT system agent (i.e. there is no automatic tiling of
* the mmapping through the fence registers). * 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) 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 * This functions wraps up procedure to establish a memory mapping through
* direct cpu access, bypassing the gpu completely. * 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) void *gem_mmap__cpu(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot)
{ {