hpsa: fix 6-byte READ/WRITE with 0 length data xfer
a 6-byte READ/WRITE CDB with a 0 block data transfer really means a 256 block data transfer. The RAID mapping code failed to handle this case. For 10/12/16 byte READ/WRITEs, 0 just means no data should be transferred, and should not trigger BUG_ON. Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Reported-by: Robert Elliott <elliott@hp.com> Reviewed-by: Robert Elliott <elliott@hp.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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@ -3686,6 +3686,8 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_info *h,
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(((u64) cmd->cmnd[2]) << 8) |
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cmd->cmnd[3];
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block_cnt = cmd->cmnd[4];
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if (block_cnt == 0)
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block_cnt = 256;
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break;
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case WRITE_10:
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is_write = 1;
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@ -3734,7 +3736,6 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_info *h,
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default:
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return IO_ACCEL_INELIGIBLE; /* process via normal I/O path */
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}
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BUG_ON(block_cnt == 0);
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last_block = first_block + block_cnt - 1;
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/* check for write to non-RAID-0 */
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