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IDE: Do not flush empty CDROM drives

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The block backend changed in a way that flushing empty CDROM drives now
crashes.  Amend IDE to avoid doing so until the root problem can be
addressed for 2.11.

Original patch by John Snow <jsnow@redhat.com>.

Reported-by: Kieron Shorrock <kshorrock@paloaltonetworks.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20170809160212.29976-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2017-08-09 17:02:11 +01:00
parent b38df311c1
commit 4da97120d5
1 changed files with 9 additions and 1 deletions
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8
hw/ide/core.c
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@ -1063,7 +1063,15 @@ static void ide_flush_cache(IDEState *s)
s->status |= BUSY_STAT;
ide_set_retry(s);
block_acct_start(blk_get_stats(s->blk), &s->acct, 0, BLOCK_ACCT_FLUSH);
if (blk_bs(s->blk)) {
s->pio_aiocb = blk_aio_flush(s->blk, ide_flush_cb, s);
} else {
/* XXX blk_aio_flush() crashes when blk_bs(blk) is NULL, remove this
* temporary workaround when blk_aio_*() functions handle NULL blk_bs.
*/
ide_flush_cb(s, 0);
}
}
static void ide_cfata_metadata_inquiry(IDEState *s)