Simon Glass 1e9ced28f1 dm: core: Don't allow uclass use before ready ... At present it is possible to call uclass_get() before driver model is inited. In fact this happens on x86 boards which use Intel FSPv1, since mrccache_get_region() tries to get the SPI flash device very early during init. This has always been undefined behaviour. Previously it generally worked, i.e. returned an error code without crashing, because gd->uclass_root_s is zeroed and the uclass can be added despite driver model not being ready, due to the way lists are implemented. With the change to use a gd->uclass_root pointer, this no-longer works. For example, it causes a hang on minnowmax. Fix this by adding a check that driver model is ready when uclass_get() is called. This function is called in the process of locating any device, so it is a good place to add the check. This fixes booting on minnowmax. Signed-off-by: Simon Glass <sjg@chromium.org> Fixes: 8a715530bb ("dm: core: Allow the uclass list to move")		2021-08-08 11:27:27 -06:00
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