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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1 changed files with 4 additions and 1 deletions
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@ -615,7 +615,10 @@ sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
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else
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hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
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hp->dxfer_len = mxsize;
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hp->dxferp = (char __user *)buf + cmd_size;
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if (hp->dxfer_direction == SG_DXFER_TO_DEV)
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hp->dxferp = (char __user *)buf + cmd_size;
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else
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hp->dxferp = NULL;
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hp->sbp = NULL;
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hp->timeout = old_hdr.reply_len; /* structure abuse ... */
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hp->flags = input_size; /* structure abuse ... */
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