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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-09-02 03:20:20 -0400
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 02:56:12 -0400
commitfad7f01e61bf737fe8a3740d803f000db57ecac6 (patch)
treed72959e6b5043bf3436f122ebcddb0c8f41d1acf /block
parent818827669d85b84241696ffef2de485db46b0b5e (diff)
sg: set dxferp to NULL for READ with the older SG interface
With the older SG interface, we don't know a user-space address to trasfer data when executing a SCSI command. So we can't pass a user-space address to blk_rq_map_user. This patch fixes sg to pass a NULL user-space address to blk_rq_map_user so that it just sets up a request and bios with page frames propely without data transfer. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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