From: Hannes Reinecke <hare@suse.de>
Date: Mon, 7 Mar 2011 07:56:44 +0000 (+0100)
Subject: libata: Include WWN ID in inquiry VPD emulation
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6b3b9d73e08d8939aaf54f85bb47495171f49e20;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

libata: Include WWN ID in inquiry VPD emulation

As per SAT-3 the WWN ID should be included in the VPD page 0x83
(device identification) emulation.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
---

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index c11675f34b9..a8341999135 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2056,6 +2056,17 @@ static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
 		      ATA_ID_SERNO_LEN);
 	num += ATA_ID_SERNO_LEN;
 
+	if (ata_id_has_wwn(args->id)) {
+		/* SAT defined lu world wide name */
+		/* piv=0, assoc=lu, code_set=binary, designator=NAA */
+		rbuf[num + 0] = 1;
+		rbuf[num + 1] = 3;
+		rbuf[num + 3] = ATA_ID_WWN_LEN;
+		num += 4;
+		ata_id_string(args->id, (unsigned char *) rbuf + num,
+			      ATA_ID_WWN, ATA_ID_WWN_LEN);
+		num += ATA_ID_WWN_LEN;
+	}
 	rbuf[3] = num - 4;    /* page len (assume less than 256 bytes) */
 	return 0;
 }
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 0c4929fa34d..198e1ea2b2e 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -89,6 +89,7 @@ enum {
 	ATA_ID_SPG		= 98,
 	ATA_ID_LBA_CAPACITY_2	= 100,
 	ATA_ID_SECTOR_SIZE	= 106,
+	ATA_ID_WWN		= 108,
 	ATA_ID_LOGICAL_SECTOR_SIZE	= 117,	/* and 118 */
 	ATA_ID_LAST_LUN		= 126,
 	ATA_ID_DLF		= 128,
@@ -103,6 +104,7 @@ enum {
 	ATA_ID_SERNO_LEN	= 20,
 	ATA_ID_FW_REV_LEN	= 8,
 	ATA_ID_PROD_LEN		= 40,
+	ATA_ID_WWN_LEN		= 8,
 
 	ATA_PCI_CTL_OFS		= 2,
 
@@ -815,6 +817,11 @@ static inline int ata_id_has_unload(const u16 *id)
 	return 0;
 }
 
+static inline bool ata_id_has_wwn(const u16 *id)
+{
+	return (id[ATA_ID_CSF_DEFAULT] & 0xC100) == 0x4100;
+}
+
 static inline int ata_id_form_factor(const u16 *id)
 {
 	u16 val = id[168];