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drm/gem: Clear mapping addresses for unused framebuffer planes 

Set the returned mapping address to NULL if a framebuffer plane does
not have a BO associated with it. Likewise, ignore mappings of NULL
during framebuffer unmap operations. Allows users of the functions to
perform unmap operations of certain BOs by themselfes.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210730183511.20080-4-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2021-07-30 20:35:09 +02:00
parent f6424ecdb3
commit 0ec77bd92b
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/drm_gem_framebuffer_helper.c
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@ -335,8 +335,10 @@ int drm_gem_fb_vmap(struct drm_framebuffer *fb,
for (i = 0; i < DRM_FORMAT_MAX_PLANES; ++i) {
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
if (!obj) {
dma_buf_map_clear(&map[i]);
continue;
}
ret = drm_gem_vmap(obj, &map[i]);
if (ret)
goto err_drm_gem_vunmap;
@ -376,6 +378,8 @@ void drm_gem_fb_vunmap(struct drm_framebuffer *fb,
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
if (dma_buf_map_is_null(&map[i]))
continue;
drm_gem_vunmap(obj, &map[i]);
}
}