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authorCarlos Llamas <cmllamas@google.com>2024-01-31 21:53:46 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2024-01-31 14:08:28 -0800
commit97830f3c3088638ff90b20dfba2eb4d487bf14d7 (patch)
treeb07d1f7bcab635cd87b8bd911b88a646c0616933 /scripts/patch-kernel
parentac9762a74c7ca7cbfcb4c65f5871373653a046ac (diff)
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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: 457b9a6f09f0 ("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>
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