Add internal API to remove reliance on deprecated SCSI_IOCTL_TEST_UNIT_READY

This was used by sd and sr

Instead make them use

scsi_test_unit_ready() which is exported now
from scsi_lib.c
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_ioctl.c

@@ -432,12 +432,8 @@ int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 	case SCSI_IOCTL_DOORUNLOCK:
 		return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
 	case SCSI_IOCTL_TEST_UNIT_READY:
-		scsi_cmd[0] = TEST_UNIT_READY;
-		scsi_cmd[1] = 0;
-		scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
-		scsi_cmd[4] = 0;
-		return ioctl_internal_command(sdev, scsi_cmd,
-				   IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES);
+		return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT,
+					    NORMAL_RETRIES);
 	case SCSI_IOCTL_START_UNIT:
 		scsi_cmd[0] = START_STOP;
 		scsi_cmd[1] = 0;

drivers/scsi/scsi_lib.c

@@ -1572,6 +1572,34 @@ scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 	return ret;
 }
 
+int
+scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries)
+{
+	struct scsi_request *sreq;
+	char cmd[] = {
+		TEST_UNIT_READY, 0, 0, 0, 0, 0,
+	};
+	int result;
+	
+	sreq = scsi_allocate_request(sdev, GFP_KERNEL);
+	if (!sreq)
+		return -ENOMEM;
+
+		sreq->sr_data_direction = DMA_NONE;
+        scsi_wait_req(sreq, cmd, NULL, 0, timeout, retries);
+
+	if ((driver_byte(sreq->sr_result) & DRIVER_SENSE) &&
+	    (sreq->sr_sense_buffer[2] & 0x0f) == UNIT_ATTENTION &&
+	    sdev->removable) {
+		sdev->changed = 1;
+		sreq->sr_result = 0;
+	}
+	result = sreq->sr_result;
+	scsi_release_request(sreq);
+	return result;
+}
+EXPORT_SYMBOL(scsi_test_unit_ready);
+
 /**
  *	scsi_device_set_state - Take the given device through the device
  *		state model.

drivers/scsi/sd.c

@@ -648,7 +648,7 @@ static int sd_media_changed(struct gendisk *disk)
 	 */
 	retval = -ENODEV;
 	if (scsi_block_when_processing_errors(sdp))
-		retval = scsi_ioctl(sdp, SCSI_IOCTL_TEST_UNIT_READY, NULL);
+		retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
 
 	/*
 	 * Unable to test, unit probably not ready.   This usually

drivers/scsi/sr.c

@@ -183,7 +183,7 @@ int sr_media_change(struct cdrom_device_info *cdi, int slot)
 		return -EINVAL;
 	}
 
-	retval = scsi_ioctl(cd->device, SCSI_IOCTL_TEST_UNIT_READY, NULL);
+	retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES);
 	if (retval) {
 		/* Unable to test, unit probably not ready.  This usually
 		 * means there is no disc in the drive.  Mark as changed,

include/scsi/scsi_device.h

@@ -185,6 +185,8 @@ extern int scsi_set_medium_removal(struct scsi_device *, char);
 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
 			   unsigned char *buffer, int len, int timeout,
 			   int retries, struct scsi_mode_data *data);
+extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
+				int retries);
 extern int scsi_device_set_state(struct scsi_device *sdev,
 				 enum scsi_device_state state);
 extern int scsi_device_quiesce(struct scsi_device *sdev);