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Wait until we have enough space in the virt queue to actually queue up our request. Avoids the guest spinning in case we have a non-zero amount of free entries but not enough for the request. Cc: [email protected] Reported-by: Alain Magloire <[email protected]> Signed-off-by: Gerd Hoffmann <[email protected]> Reviewed-by: Dave Airlie <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Sean Paul <[email protected]>