drm: move allocation out of drm_get_format_name()
The function's behaviour was changed in 90844f00049e, without changing
its signature, causing people to keep using it the old way without
realising they were now leaking memory.
Rob Clark also noticed it was also allocating GFP_KERNEL memory in
atomic contexts, breaking them.
Instead of having to allocate GFP_ATOMIC memory and fixing the callers
to make them cleanup the memory afterwards, let's change the function's
signature by having the caller take care of the memory and passing it to
the function.
The new parameter is a single-field struct in order to enforce the size
of its buffer and help callers to correctly manage their memory.
Fixes: 90844f00049e ("drm: make drm_get_format_name thread-safe")
Cc: Rob Clark <robdclark@gmail.com>
Cc: Christian König <christian.koenig@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Rob Clark <robdclark@gmail.com>
Acked-by: Sinclair Yeh <syeh@vmware.com> (vmwgfx)
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161112011309.9799-1-eric@engestrom.ch
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index c9465fb..7166a1a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3032,7 +3032,7 @@ static void intel_plane_info(struct seq_file *m, struct intel_crtc *intel_crtc)
for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
struct drm_plane_state *state;
struct drm_plane *plane = &intel_plane->base;
- char *format_name;
+ struct drm_format_name_buf format_name;
if (!plane->state) {
seq_puts(m, "plane->state is NULL!\n");
@@ -3042,9 +3042,9 @@ static void intel_plane_info(struct seq_file *m, struct intel_crtc *intel_crtc)
state = plane->state;
if (state->fb) {
- format_name = drm_get_format_name(state->fb->pixel_format);
+ drm_get_format_name(state->fb->pixel_format, &format_name);
} else {
- format_name = kstrdup("N/A", GFP_KERNEL);
+ sprintf(format_name.str, "N/A");
}
seq_printf(m, "\t--Plane id %d: type=%s, crtc_pos=%4dx%4d, crtc_size=%4dx%4d, src_pos=%d.%04ux%d.%04u, src_size=%d.%04ux%d.%04u, format=%s, rotation=%s\n",
@@ -3060,10 +3060,8 @@ static void intel_plane_info(struct seq_file *m, struct intel_crtc *intel_crtc)
((state->src_w & 0xffff) * 15625) >> 10,
(state->src_h >> 16),
((state->src_h & 0xffff) * 15625) >> 10,
- format_name,
+ format_name.str,
plane_rotation(state->rotation));
-
- kfree(format_name);
}
}