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block: Don't acquire AioContext in hmp_qemu_io()

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Commit 15afd94a04 added code to acquire and release the AioContext in
qemuio_command(). This means that the lock is taken twice now in the
call path from hmp_qemu_io(). This causes BDRV_POLL_WHILE() to hang for
any requests issued to nodes in a non-mainloop AioContext.

Dropping the first locking from hmp_qemu_io() fixes the problem.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2017-12-11 15:33:17 +01:00
parent 60369b86c4
commit c200c4a470
1 changed files with 0 additions and 6 deletions
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6
hmp.c
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@ -2318,7 +2318,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
{
BlockBackend *blk;
BlockBackend *local_blk = NULL;
AioContext *aio_context;
const char* device = qdict_get_str(qdict, "device");
const char* command = qdict_get_str(qdict, "command");
Error *err = NULL;
@ -2338,9 +2337,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
}
}
aio_context = blk_get_aio_context(blk);
aio_context_acquire(aio_context);
/*
* Notably absent: Proper permission management. This is sad, but it seems
* almost impossible to achieve without changing the semantics and thereby
@ -2368,8 +2364,6 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
*/
qemuio_command(blk, command);
aio_context_release(aio_context);
fail:
blk_unref(local_blk);
hmp_handle_error(mon, &err);