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Re: [Qemu-devel] [PATCH 13/14] block: Remove aio_poll() in bdrv_drain_po

From: Fam Zheng
Subject: Re: [Qemu-devel] [PATCH 13/14] block: Remove aio_poll() in bdrv_drain_poll variants
Date: Tue, 11 Sep 2018 16:35:52 +0800
User-agent: Mutt/1.10.1 (2018-07-13)

On Fri, 09/07 18:15, Kevin Wolf wrote:
> bdrv_drain_poll_top_level() was buggy because it didn't release the
> AioContext lock of the node to be drained before calling aio_poll().
> This way, callbacks called by aio_poll() would possibly take the lock a
> second time and run into a deadlock with a nested AIO_WAIT_WHILE() call.
> However, it turns out that the aio_poll() call isn't actually needed any
> more. It was introduced in commit 91af091f923, which is effectively
> reverted by this patch. The cases it was supposed to fix are now covered
> by bdrv_drain_poll(), which waits for block jobs to reach a quiescent
> state.
> Signed-off-by: Kevin Wolf <address@hidden>

Reviewed-by: Fam Zheng <address@hidden>

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