Re: [PATCH] drm/fb-helper: generic: Fix drm_fbdev_client_restore()

Den 28.01.2019 07.48, skrev Gerd Hoffmann:

...

Fix by using drm_fb_helper_lastclose() which checks if fbdev is in use.

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static int drm_fbdev_client_restore(struct drm_client_dev *client) {

• struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
• drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);

• drm_fb_helper_lastclose(client->dev);

return 0; }

Hmm, at least the drm_fb_helper_lastclose() version I'm looking at (branch drm-misc-next) just calls drm_fb_helper_restore_fbdev_mode_unlocked without any check ...

drm_fb_helper_lastclose() uses drm_device->fb_helper which is NULL if fbdev is not in use, from docs: /** * @fb_helper: * * Pointer to the fbdev emulation structure. * Set by drm_fb_helper_init() and cleared by drm_fb_helper_fini().

And drm_fb_helper_restore_fbdev_mode_unlocked() has a NULL check.

Noralf.