From 1e9ced28f18ed75bef96df08e47baad27dd51829 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sun, 1 Aug 2021 12:05:23 -0600 Subject: 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 Fixes: 8a715530bb1 ("dm: core: Allow the uclass list to move") --- test/dm/core.c | 1 + 1 file changed, 1 insertion(+) (limited to 'test') diff --git a/test/dm/core.c b/test/dm/core.c index 48e66b73335..c9a7606666c 100644 --- a/test/dm/core.c +++ b/test/dm/core.c @@ -994,6 +994,7 @@ static int dm_test_uclass_before_ready(struct unit_test_state *uts) memset(&gd->uclass_root, '\0', sizeof(gd->uclass_root)); ut_asserteq_ptr(NULL, uclass_find(UCLASS_TEST)); + ut_asserteq(-EDEADLK, uclass_get(UCLASS_TEST, &uc)); return 0; } -- cgit v1.2.3