scsi: sr: cdrom: Move cdrom_read_cdda_bpc() into the sr driver

cdrom_read_cdda_bpc() relies on sending SCSI command to the low level
driver using a REQ_OP_SCSI_IN request.  This isn't generic block layer
functionality, so move the actual low-level code into the sr driver and
call it through a new read_cdda_bpc method in the cdrom_device_ops
structure.

With this the CDROM code does not have to pull in scsi_normalize_sense()
and depend on CONFIG_SCSI_COMMON.

Link: https://lore.kernel.org/r/20210730072752.GB23847%40lst.de
Tested-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 8 insertions, 63 deletions

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 8882b311bafd..bd2e5b1560f5 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -629,7 +629,7 @@ int register_cdrom(struct gendisk *disk, struct cdrom_device_info *cdi)
 	if (CDROM_CAN(CDC_MRW_W))
 		cdi->exit = cdrom_mrw_exit;
 
-	if (cdi->disk)
+	if (cdi->ops->read_cdda_bpc)
 		cdi->cdda_method = CDDA_BPC_FULL;
 	else
 		cdi->cdda_method = CDDA_OLD;
@@ -2159,81 +2159,26 @@ static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf,
 static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
 			       int lba, int nframes)
 {
-	struct request_queue *q = cdi->disk->queue;
-	struct request *rq;
-	struct scsi_request *req;
-	struct bio *bio;
-	unsigned int len;
+	int max_frames = (queue_max_sectors(cdi->disk->queue) << 9) /
+			  CD_FRAMESIZE_RAW;
 	int nr, ret = 0;
 
-	if (!q)
-		return -ENXIO;
-
-	if (!blk_queue_scsi_passthrough(q)) {
-		WARN_ONCE(true,
-			  "Attempt read CDDA info through a non-SCSI queue\n");
-		return -EINVAL;
-	}
-
 	cdi->last_sense = 0;
 
 	while (nframes) {
-		nr = nframes;
 		if (cdi->cdda_method == CDDA_BPC_SINGLE)
 			nr = 1;
-		if (nr * CD_FRAMESIZE_RAW > (queue_max_sectors(q) << 9))
-			nr = (queue_max_sectors(q) << 9) / CD_FRAMESIZE_RAW;
-
-		len = nr * CD_FRAMESIZE_RAW;
-
-		rq = blk_get_request(q, REQ_OP_DRV_IN, 0);
-		if (IS_ERR(rq)) {
-			ret = PTR_ERR(rq);
-			break;
-		}
-		req = scsi_req(rq);
-
-		ret = blk_rq_map_user(q, rq, NULL, ubuf, len, GFP_KERNEL);
-		if (ret) {
-			blk_put_request(rq);
-			break;
-		}
-
-		req->cmd[0] = GPCMD_READ_CD;
-		req->cmd[1] = 1 << 2;
-		req->cmd[2] = (lba >> 24) & 0xff;
-		req->cmd[3] = (lba >> 16) & 0xff;
-		req->cmd[4] = (lba >>  8) & 0xff;
-		req->cmd[5] = lba & 0xff;
-		req->cmd[6] = (nr >> 16) & 0xff;
-		req->cmd[7] = (nr >>  8) & 0xff;
-		req->cmd[8] = nr & 0xff;
-		req->cmd[9] = 0xf8;
-
-		req->cmd_len = 12;
-		rq->timeout = 60 * HZ;
-		bio = rq->bio;
-
-		blk_execute_rq(cdi->disk, rq, 0);
-		if (scsi_req(rq)->result) {
-			struct scsi_sense_hdr sshdr;
-
-			ret = -EIO;
-			scsi_normalize_sense(req->sense, req->sense_len,
-					     &sshdr);
-			cdi->last_sense = sshdr.sense_key;
-		}
-
-		if (blk_rq_unmap_user(bio))
-			ret = -EFAULT;
-		blk_put_request(rq);
+		else
+			nr = min(nframes, max_frames);
 
+		ret = cdi->ops->read_cdda_bpc(cdi, ubuf, lba, nr,
+					      &cdi->last_sense);
 		if (ret)
 			break;
 
 		nframes -= nr;
 		lba += nr;
-		ubuf += len;
+		ubuf += (nr * CD_FRAMESIZE_RAW);
 	}
 
 	return ret;