Merge branch 'upstream'

drivers/scsi/ahci.c

@@ -549,6 +549,12 @@ static int ahci_softreset(struct ata_port *ap, int verbose, unsigned int *class)
 
 	DPRINTK("ENTER\n");
 
+	if (!sata_dev_present(ap)) {
+		DPRINTK("PHY reports no device\n");
+		*class = ATA_DEV_NONE;
+		return 0;
+	}
+
 	/* prepare for SRST (AHCI-1.1 10.4.1) */
 	rc = ahci_stop_engine(ap);
 	if (rc) {

drivers/scsi/libata-core.c

@@ -76,6 +76,10 @@ int atapi_enabled = 1;
 module_param(atapi_enabled, int, 0444);
 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
 
+int atapi_dmadir = 0;
+module_param(atapi_dmadir, int, 0444);
+MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
+
 int libata_fua = 0;
 module_param_named(fua, libata_fua, int, 0444);
 MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");

drivers/scsi/libata-scsi.c

@@ -2163,11 +2163,9 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
 		qc->tf.protocol = ATA_PROT_ATAPI_DMA;
 		qc->tf.feature |= ATAPI_PKT_DMA;
 
-#ifdef ATAPI_ENABLE_DMADIR
-		/* some SATA bridges need us to indicate data xfer direction */
-		if (cmd->sc_data_direction != DMA_TO_DEVICE)
+		if (atapi_dmadir && (cmd->sc_data_direction != DMA_TO_DEVICE))
+			/* some SATA bridges need us to indicate data xfer direction */
 			qc->tf.feature |= ATAPI_DMADIR;
-#endif
 	}
 
 	qc->nbytes = cmd->bufflen;

drivers/scsi/libata.h

@@ -41,6 +41,7 @@ struct ata_scsi_args {
 
 /* libata-core.c */
 extern int atapi_enabled;
+extern int atapi_dmadir;
 extern int libata_fua;
 extern struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
 				      struct ata_device *dev);

include/linux/libata.h

@@ -44,7 +44,6 @@
 #undef ATA_NDEBUG		/* define to disable quick runtime checks */
 #undef ATA_ENABLE_PATA		/* define to enable PATA support in some
 				 * low-level drivers */
-#undef ATAPI_ENABLE_DMADIR	/* enables ATAPI DMADIR bridge support */
 
 
 /* note: prints function name for you */