ata: fix read_id() ata port operation interface

Drivers that need to tweak a device IDENTIFY data implement the
read_id() port operation. The IDENTIFY data buffer is passed as an
argument to the read_id() operation for drivers to use. However, when
this operation is called, the IDENTIFY data is not yet converted to CPU
endian and contains le16 words.

Change the interface of the read_id operation to pass a __le16 * pointer
to the IDENTIFY data buffer to clarify the buffer endianness. Fix the
pata_netcell, pata_it821x, ahci_xgene, ahci_ceva and ahci_brcm drivers
implementation of this operation and modify the code to corretly deal
with identify data words manipulation to avoid sparse warnings such as:

drivers/ata/ahci_xgene.c:262:33: warning: invalid assignment: &=
drivers/ata/ahci_xgene.c:262:33:    left side has type unsigned short
drivers/ata/ahci_xgene.c:262:33:    right side has type restricted __le16

Signed-off-by: Damien Le Moal <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>

Author: Damien Le Moal

drivers/ata/ahci_brcm.c

@@ -246,7 +246,7 @@ static void brcm_sata_init(struct brcm_ahci_priv *priv)
 }
 
 static unsigned int brcm_ahci_read_id(struct ata_device *dev,
-				      struct ata_taskfile *tf, u16 *id)
+				      struct ata_taskfile *tf, __le16 *id)
 {
 	struct ata_port *ap = dev->link->ap;
 	struct ata_host *host = ap->host;

drivers/ata/ahci_ceva.c

@@ -92,9 +92,8 @@ struct ceva_ahci_priv {
 };
 
 static unsigned int ceva_ahci_read_id(struct ata_device *dev,
-					struct ata_taskfile *tf, u16 *id)
+				      struct ata_taskfile *tf, __le16 *id)
 {
-	__le16 *__id = (__le16 *)id;
 	u32 err_mask;
 
 	err_mask = ata_do_dev_read_id(dev, tf, id);
@@ -104,7 +103,7 @@ static unsigned int ceva_ahci_read_id(struct ata_device *dev,
 	 * Since CEVA controller does not support device sleep feature, we
 	 * need to clear DEVSLP (bit 8) in word78 of the IDENTIFY DEVICE data.
 	 */
-	__id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8));
+	id[ATA_ID_FEATURE_SUPP] &= cpu_to_le16(~(1 << 8));
 
 	return 0;
 }

drivers/ata/ahci_xgene.c

@@ -237,7 +237,7 @@ static bool xgene_ahci_is_memram_inited(struct xgene_ahci_context *ctx)
  * does not support DEVSLP.
  */
 static unsigned int xgene_ahci_read_id(struct ata_device *dev,
-				       struct ata_taskfile *tf, u16 *id)
+				       struct ata_taskfile *tf, __le16 *id)
 {
 	u32 err_mask;
 

drivers/ata/libata-core.c

@@ -1722,7 +1722,7 @@ static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
  *	this function is wrapped or replaced by the driver
  */
 unsigned int ata_do_dev_read_id(struct ata_device *dev,
-					struct ata_taskfile *tf, u16 *id)
+				struct ata_taskfile *tf, __le16 *id)
 {
 	return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
 				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
@@ -1795,9 +1795,9 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
 	tf.flags |= ATA_TFLAG_POLLING;
 
 	if (ap->ops->read_id)
-		err_mask = ap->ops->read_id(dev, &tf, id);
+		err_mask = ap->ops->read_id(dev, &tf, (__le16 *)id);
 	else
-		err_mask = ata_do_dev_read_id(dev, &tf, id);
+		err_mask = ata_do_dev_read_id(dev, &tf, (__le16 *)id);
 
 	if (err_mask) {
 		if (err_mask & AC_ERR_NODEV_HINT) {

drivers/ata/pata_it821x.c

@@ -537,29 +537,28 @@ static void it821x_dev_config(struct ata_device *adev)
  */
 
 static unsigned int it821x_read_id(struct ata_device *adev,
-					struct ata_taskfile *tf, u16 *id)
+				   struct ata_taskfile *tf, __le16 *id)
 {
 	unsigned int err_mask;
 	unsigned char model_num[ATA_ID_PROD_LEN + 1];
 
 	err_mask = ata_do_dev_read_id(adev, tf, id);
 	if (err_mask)
 		return err_mask;
-	ata_id_c_string(id, model_num, ATA_ID_PROD, sizeof(model_num));
+	ata_id_c_string((u16 *)id, model_num, ATA_ID_PROD, sizeof(model_num));
 
-	id[83] &= ~(1 << 12);	/* Cache flush is firmware handled */
-	id[83] &= ~(1 << 13);	/* Ditto for LBA48 flushes */
-	id[84] &= ~(1 << 6);	/* No FUA */
-	id[85] &= ~(1 << 10);	/* No HPA */
-	id[76] = 0;		/* No NCQ/AN etc */
+	id[83] &= cpu_to_le16(~(1 << 12)); /* Cache flush is firmware handled */
+	id[84] &= cpu_to_le16(~(1 << 6));  /* No FUA */
+	id[85] &= cpu_to_le16(~(1 << 10)); /* No HPA */
+	id[76] = 0;			   /* No NCQ/AN etc */
 
 	if (strstr(model_num, "Integrated Technology Express")) {
 		/* Set feature bits the firmware neglects */
-		id[49] |= 0x0300;	/* LBA, DMA */
-		id[83] &= 0x7FFF;
-		id[83] |= 0x4400;	/* Word 83 is valid and LBA48 */
-		id[86] |= 0x0400;	/* LBA48 on */
-		id[ATA_ID_MAJOR_VER] |= 0x1F;
+		id[49] |= cpu_to_le16(0x0300);	/* LBA, DMA */
+		id[83] &= cpu_to_le16(0x7FFF);
+		id[83] |= cpu_to_le16(0x4400);	/* Word 83 is valid and LBA48 */
+		id[86] |= cpu_to_le16(0x0400);	/* LBA48 on */
+		id[ATA_ID_MAJOR_VER] |= cpu_to_le16(0x1F);
 		/* Clear the serial number because it's different each boot
 		   which breaks validation on resume */
 		memset(&id[ATA_ID_SERNO], 0x20, ATA_ID_SERNO_LEN);

drivers/ata/pata_netcell.c

@@ -21,12 +21,13 @@
 /* No PIO or DMA methods needed for this device */
 
 static unsigned int netcell_read_id(struct ata_device *adev,
-					struct ata_taskfile *tf, u16 *id)
+				    struct ata_taskfile *tf, __le16 *id)
 {
 	unsigned int err_mask = ata_do_dev_read_id(adev, tf, id);
+
 	/* Firmware forgets to mark words 85-87 valid */
 	if (err_mask == 0)
-		id[ATA_ID_CSF_DEFAULT] |= 0x4000;
+		id[ATA_ID_CSF_DEFAULT] |= cpu_to_le16(0x4000);
 	return err_mask;
 }
 

include/linux/libata.h

@@ -884,7 +884,8 @@ struct ata_port_operations {
 	void (*set_piomode)(struct ata_port *ap, struct ata_device *dev);
 	void (*set_dmamode)(struct ata_port *ap, struct ata_device *dev);
 	int  (*set_mode)(struct ata_link *link, struct ata_device **r_failed_dev);
-	unsigned int (*read_id)(struct ata_device *dev, struct ata_taskfile *tf, u16 *id);
+	unsigned int (*read_id)(struct ata_device *dev, struct ata_taskfile *tf,
+				__le16 *id);
 
 	void (*dev_config)(struct ata_device *dev);
 
@@ -1119,7 +1120,7 @@ extern void ata_id_string(const u16 *id, unsigned char *s,
 extern void ata_id_c_string(const u16 *id, unsigned char *s,
 			    unsigned int ofs, unsigned int len);
 extern unsigned int ata_do_dev_read_id(struct ata_device *dev,
-					struct ata_taskfile *tf, u16 *id);
+				       struct ata_taskfile *tf, __le16 *id);
 extern void ata_qc_complete(struct ata_queued_cmd *qc);
 extern u64 ata_qc_get_active(struct ata_port *ap);
 extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd);