From 50128aeb0f8bb5a2d820e4c7a6ac0bb745809fc1 Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Fri, 28 Oct 2022 13:50:54 +0200 Subject: cyclic: get rid of cyclic_init() Currently, we must call cyclic_init() at some point before cyclic_register() becomes possible. That turns out to be somewhat awkward, especially with SPL, and has resulted in a watchdog callback not being registered, thus causing the board to prematurely reset. We already rely on gd->cyclic reliably being set to NULL by the asm code that clears all of gd. Now that the cyclic list is a hlist, and thus an empty list is represented by a NULL head pointer, and struct cyclic_drv has no other members, we can just as well drop a level of indirection and put the hlist_head directly in struct global_data. This doesn't increase the size of struct global_data, gets rid of an early malloc(), and generates slightly smaller code. But primarily, this avoids having to call cyclic_init() early; the cyclic infrastructure is simply ready to register callbacks as soon as we enter C code. We can still end up with schedule() being called from asm very early, so we still need to check that gd itself has been properly initialized [*], but once it has, gd->cyclic_list is perfectly fine to access, and will just be an empty list. As for cyclic_uninit(), it was never really the opposite of cyclic_init() since it didn't free the struct cyclic_drv nor set gd->cyclic to NULL. Rename it to cyclic_unregister_all() and use that in test/, and also insert a call at the end of the board_init_f sequence so that gd->cyclic_list is a fresh empty list before we enter board_init_r(). A small piece of ugliness is that I had to add a cast in cyclic_get_list() to silence a "discards 'volatile' qualifier" warning, but that is completely equivalent to the existing handling of the uclass_root_s list_head member. [*] I'm not really sure where we guarantee that the register used for gd contains 0 until it gets explicitly initialized, but that must be the case, otherwise testing gd for being NULL would not make much sense. Signed-off-by: Rasmus Villemoes Reviewed-by: Stefan Roese Tested-by: Stefan Roese Tested-by: Tim Harvey # imx8mm-venice-* --- common/board_r.c | 1 - 1 file changed, 1 deletion(-) (limited to 'common/board_r.c') diff --git a/common/board_r.c b/common/board_r.c index 828ad44866..db9cfb33ad 100644 --- a/common/board_r.c +++ b/common/board_r.c @@ -617,7 +617,6 @@ static init_fnc_t init_sequence_r[] = { #endif initr_barrier, initr_malloc, - cyclic_init, log_init, initr_bootstage, /* Needs malloc() but has its own timer */ #if defined(CONFIG_CONSOLE_RECORD) -- cgit v1.2.3