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block: don't assume device has a request list backing in nr_requests …
…store commit b8a9ae779f2c7049071034661e09cb7e1e82250c upstream. Stacked devices do not. For now, just error out with -EINVAL. Later we could make the limit apply on stacked devices too, for throttling reasons. This fixes 5a54cd13353bb3b88887604e2c980aa01e314309 and should go into 2.6.31 stable as well. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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