linux/drivers/android
Carlos Llamas 97830f3c30 binder: signal epoll threads of self-work
In (e)poll mode, threads often depend on I/O events to determine when
data is ready for consumption. Within binder, a thread may initiate a
command via BINDER_WRITE_READ without a read buffer and then make use
of epoll_wait() or similar to consume any responses afterwards.

It is then crucial that epoll threads are signaled via wakeup when they
queue their own work. Otherwise, they risk waiting indefinitely for an
event leaving their work unhandled. What is worse, subsequent commands
won't trigger a wakeup either as the thread has pending work.

Fixes: 457b9a6f09 ("Staging: android: add binder driver")
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Martijn Coenen <maco@android.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Steven Moreland <smoreland@google.com>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20240131215347.1808751-1-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-01-31 14:08:28 -08:00
..
binder_alloc_selftest.c android: binder: fix a kernel-doc enum warning 2023-12-06 08:48:26 +09:00
binder_alloc.c Char/Misc and other Driver changes for 6.8-rc1 2024-01-17 16:47:17 -08:00
binder_alloc.h binder: switch alloc->mutex to spinlock_t 2023-12-05 09:23:41 +09:00
binder_internal.h Binder: Add async from to transaction record 2023-05-13 20:38:12 +09:00
binder_trace.h binder: keep vma addresses type as unsigned long 2023-12-05 09:23:38 +09:00
binder.c binder: signal epoll threads of self-work 2024-01-31 14:08:28 -08:00
binderfs.c android: removed duplicate linux/errno 2024-01-07 09:48:26 +01:00
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