Carlos Llamas 31643d84b8 binder: fix hang of unregistered readers ... With the introduction of binder_available_for_proc_work_ilocked() in commit 1b77e9dcc3 ("ANDROID: binder: remove proc waitqueue") a binder thread can only "wait_for_proc_work" after its thread->looper has been marked as BINDER_LOOPER_STATE_{ENTERED|REGISTERED}. This means an unregistered reader risks waiting indefinitely for work since it never gets added to the proc->waiting_threads. If there are no further references to its waitqueue either the task will hang. The same applies to readers using the (e)poll interface. I couldn't find the rationale behind this restriction. So this patch restores the previous behavior of allowing unregistered threads to "wait_for_proc_work". Note that an error message for this scenario, which had previously become unreachable, is now re-enabled. Fixes: 1b77e9dcc3 ("ANDROID: binder: remove proc waitqueue") Cc: stable@vger.kernel.org Cc: Martijn Coenen <maco@google.com> Cc: Arve Hjønnevåg <arve@google.com> Signed-off-by: Carlos Llamas <cmllamas@google.com> Link: https://lore.kernel.org/r/20240711201452.2017543-1-cmllamas@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-07-12 11:31:37 +02:00
..
binder_alloc_selftest.c	android: binder: fix a kernel-doc enum warning	2023-12-06 08:48:26 +09:00
binder_alloc.c	binder_alloc: Replace kcalloc with kvcalloc to mitigate OOM issues	2024-07-03 16:22:36 +02:00
binder_alloc.h	binder: switch alloc->mutex to spinlock_t	2023-12-05 09:23:41 +09:00
binder_internal.h	binder: use bitmap for faster descriptor lookup	2024-07-03 16:21:59 +02:00
binder_trace.h	binder: keep vma addresses type as unsigned long	2023-12-05 09:23:38 +09:00
binder.c	binder: fix hang of unregistered readers	2024-07-12 11:31:37 +02:00
binderfs.c	android: removed duplicate linux/errno	2024-01-07 09:48:26 +01:00
dbitmap.h	binder: use bitmap for faster descriptor lookup	2024-07-03 16:21:59 +02:00
Kconfig	remove CONFIG_ANDROID	2022-07-01 10:41:09 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00