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Commit a0c0b0e9 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Tejun Heo
Browse files

libata: don't call ata_scsi_rbuf_fill for command without a response buffer 



No need to copy a zeroed buffer to the caller if the command is defined
to not have a response in the SCSI spec.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 8fc6c065

drivers/ata/libata-scsi.c

+1 −21
Original line number Diff line number Diff line
@@ -2452,23 +2452,6 @@ static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf) 
	return 0;

}



/**

 *	ata_scsiop_noop - Command handler that simply returns success.

 *	@args: device IDENTIFY data / SCSI command of interest.

 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.

 *

 *	No operation.  Simply returns success to caller, to indicate

 *	that the caller should successfully complete this SCSI command.

 *

 *	LOCKING:

 *	spin_lock_irqsave(host lock)

 */

static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)

{

	VPRINTK("ENTER\n");

	return 0;

}



/**

 *	modecpy - Prepare response for MODE SENSE

 *	@dest: output buffer
@@ -4425,14 +4408,11 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd) 
	case SEEK_6:

	case SEEK_10:

	case TEST_UNIT_READY:

		ata_scsi_rbuf_fill(&args, ata_scsiop_noop);

		break;



	case SEND_DIAGNOSTIC:

		tmp8 = scsicmd[1] & ~(1 << 3);

		if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))

			ata_scsi_rbuf_fill(&args, ata_scsiop_noop);

		else

		if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4])

			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);

		break;