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commit7370997d48upstream. Don't error out if the dasd_biodasdinfo symbol is not available. Cc: stable@vger.kernel.org Fixes:26d7e28e38("s390/dasd: remove ioctl_by_bdev calls") Reported-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>