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qemu-patch-raspberry4
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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 <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
stable-4.0
Kevin Wolf 2019-02-20 18:00:07 +01:00
parent 6886ceaf61
commit 2a239e6e03
1 changed files with 6 additions and 6 deletions
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12
io/channel.c
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@ -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);
}