Commit 097b8457 authored by Tejun Heo's avatar Tejun Heo Committed by Linus Torvalds
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[PATCH] scsi: clear garbage after CDBs on SG_IO

ATAPI devices transfer fixed number of bytes for CDBs (12 or 16).  Some
ATAPI devices choke when shorter CDB is used and the left bytes contain
garbage.  Block SG_IO cleared left bytes but SCSI SG_IO didn't.  This patch
makes SCSI SG_IO clear it and simplify CDB clearing in block SG_IO.
Signed-off-by: default avatarTejun Heo <>
Cc: Mathieu Fluhr <>
Cc: James Bottomley <>
Cc: Douglas Gilbert <>
Acked-by: default avatarJens Axboe <>
Cc: <>
Acked-by: default avatarJeff Garzik <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent ae56fb16
......@@ -286,9 +286,8 @@ static int sg_io(struct file *file, request_queue_t *q,
* fill in request structure
rq->cmd_len = hdr->cmd_len;
memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
memcpy(rq->cmd, cmd, hdr->cmd_len);
if (sizeof(rq->cmd) != hdr->cmd_len)
memset(rq->cmd + hdr->cmd_len, 0, sizeof(rq->cmd) - hdr->cmd_len);
memset(sense, 0, sizeof(sense));
rq->sense = sense;
......@@ -410,6 +410,7 @@ int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
goto free_req;
req->cmd_len = cmd_len;
memset(req->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
memcpy(req->cmd, cmd, req->cmd_len);
req->sense = sioc->sense;
req->sense_len = 0;
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