From 2a239e6e03ee188f69f159bb5d8baf648a54c9c1 Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Wed, 20 Feb 2019 18:00:07 +0100 Subject: [PATCH] io: Remove redundant read/write_coroutine assignments qio_channel_yield() now updates ioc->read_write/coroutine and calls qio_channel_set_aio_fd_handlers(), so the code in the handlers has become redundant and can be removed. This does not make a difference in intermediate states because aio_co_wake() really enters the coroutine immediately here: These handlers are never run in coroutine context, and we're in the right AioContext because qio_channel_attach_aio_context() asserts that the handlers are inactive. To make these conditions more obvious, assert the right AioContext. Suggested-by: Paolo Bonzini Signed-off-by: Kevin Wolf --- io/channel.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/io/channel.c b/io/channel.c index 303376e08d..2a26c2a2c0 100644 --- a/io/channel.c +++ b/io/channel.c @@ -400,15 +400,14 @@ off_t qio_channel_io_seek(QIOChannel *ioc, } -static void qio_channel_set_aio_fd_handlers(QIOChannel *ioc); - static void qio_channel_restart_read(void *opaque) { QIOChannel *ioc = opaque; Coroutine *co = ioc->read_coroutine; - ioc->read_coroutine = NULL; - qio_channel_set_aio_fd_handlers(ioc); + /* Assert that aio_co_wake() reenters the coroutine directly */ + assert(qemu_get_current_aio_context() == + qemu_coroutine_get_aio_context(co)); aio_co_wake(co); } @@ -417,8 +416,9 @@ static void qio_channel_restart_write(void *opaque) QIOChannel *ioc = opaque; Coroutine *co = ioc->write_coroutine; - ioc->write_coroutine = NULL; - qio_channel_set_aio_fd_handlers(ioc); + /* Assert that aio_co_wake() reenters the coroutine directly */ + assert(qemu_get_current_aio_context() == + qemu_coroutine_get_aio_context(co)); aio_co_wake(co); }