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block: Honor blk_set_aio_context() context requirements

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The documentation for bdrv_set_aio_context_ignore() states this:

 * The caller must own the AioContext lock for the old AioContext of bs, but it
 * must not own the AioContext lock for new_context (unless new_context is the
 * same as the current context of bs).

As blk_set_aio_context() makes use of this function, this rule also
applies to it.

Fix all occurrences where this rule wasn't honored.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Sergio Lopez <slp@redhat.com>
Message-Id: <20201214170519.223781-2-slp@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Sergio Lopez 2020-12-14 18:05:16 +01:00 • committed by Eric Blake
parent af74b550bd
commit c7040ff64e
3 changed files with 14 additions and 3 deletions
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7
hw/block/dataplane/xen-block.c
View file

@ -725,6 +725,7 @@ void xen_block_dataplane_start(XenBlockDataPlane *dataplane,
{
ERRP_GUARD();
XenDevice *xendev = dataplane->xendev;
AioContext *old_context;
unsigned int ring_size;
unsigned int i;
@ -808,10 +809,14 @@ void xen_block_dataplane_start(XenBlockDataPlane *dataplane,
goto stop;
}
aio_context_acquire(dataplane->ctx);
old_context = blk_get_aio_context(dataplane->blk);
aio_context_acquire(old_context);
/* If other users keep the BlockBackend in the iothread, that's ok */
blk_set_aio_context(dataplane->blk, dataplane->ctx, NULL);
aio_context_release(old_context);
/* Only reason for failure is a NULL channel */
aio_context_acquire(dataplane->ctx);
xen_device_set_event_channel_context(xendev, dataplane->event_channel,
dataplane->ctx, &error_abort);
aio_context_release(dataplane->ctx);