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DEEPIN: scsi: Bypass certain SCSI commands on disks with "use_192_bytes_for_3f" attribute #7

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DEEPIN: scsi: Bypass certain SCSI commands on disks with "use_192_bytes_for_3f" attribute #7

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12 changes: 12 additions & 0 deletions drivers/scsi/scsi_lib.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1568,6 +1568,7 @@ static void scsi_complete(struct request *rq)
static int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
{
struct Scsi_Host *host = cmd->device->host;
struct scsi_device *sdev = cmd->device;
int rtn = 0;

atomic_inc(&cmd->device->iorequest_cnt);
Expand Down Expand Up @@ -1616,6 +1617,17 @@ static int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
goto done;
}

/*
* Before we queue this command, check attribute use_192_bytes_for_3f.
* Because transmits data with a length of 0xff bytes via ioctl may
* cause some hard drives to hang and become unusable.
*/
if (cmd->cmnd[0] == MODE_SENSE && sdev->use_192_bytes_for_3f &&
cmd->cmnd[2] == 0x3f && cmd->cmnd[4] != 192) {
cmd->result = DID_ABORT << 16;
goto done;
}

if (unlikely(host->shost_state == SHOST_DEL)) {
cmd->result = (DID_NO_CONNECT << 16);
goto done;
Expand Down