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drm/core: Fix old_fb handling in pan_display_atomic. 

Don't touch plane->old_fb/fb without having the right locks held.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447237751-9663-6-git-send-email-maarten.lankhorst@ubuntu.com
This commit is contained in:
Maarten Lankhorst 2015-11-11 11:29:11 +01:00 committed by Jani Nikula
parent f72c6b33ed
commit 07d3bad6c1
1 changed files with 8 additions and 22 deletions
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30
drivers/gpu/drm/drm_fb_helper.c
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@ -1227,7 +1227,9 @@ static int pan_display_atomic(struct fb_var_screeninfo *var,
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct drm_atomic_state *state;
struct drm_plane *plane;
int i, ret;
unsigned plane_mask;
state = drm_atomic_state_alloc(dev);
if (!state)
@ -1235,19 +1237,22 @@ static int pan_display_atomic(struct fb_var_screeninfo *var,
state->acquire_ctx = dev->mode_config.acquire_ctx;
retry:
plane_mask = 0;
for(i = 0; i < fb_helper->crtc_count; i++) {
struct drm_mode_set *mode_set;
mode_set = &fb_helper->crtc_info[i].mode_set;
mode_set->crtc->primary->old_fb = mode_set->crtc->primary->fb;
mode_set->x = var->xoffset;
mode_set->y = var->yoffset;
ret = __drm_atomic_helper_set_config(mode_set, state);
if (ret != 0)
goto fail;
plane = mode_set->crtc->primary;
plane_mask |= drm_plane_index(plane);
plane->old_fb = plane->fb;
}
ret = drm_atomic_commit(state);
@ -1259,26 +1264,7 @@ static int pan_display_atomic(struct fb_var_screeninfo *var,
fail:
for(i = 0; i < fb_helper->crtc_count; i++) {
struct drm_mode_set *mode_set;
struct drm_plane *plane;
mode_set = &fb_helper->crtc_info[i].mode_set;
plane = mode_set->crtc->primary;
if (ret == 0) {
struct drm_framebuffer *new_fb = plane->state->fb;
if (new_fb)
drm_framebuffer_reference(new_fb);
plane->fb = new_fb;
plane->crtc = plane->state->crtc;
if (plane->old_fb)
drm_framebuffer_unreference(plane->old_fb);
}
plane->old_fb = NULL;
}
drm_atomic_clean_old_fb(dev, plane_mask, ret);
if (ret == -EDEADLK)
goto backoff;