linux-kernel - [035/165] libata: Use Maximum Write Same Length to report discard size

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Message-Id: <20110601081109.663529749@blue.kroah.org>
Date:	Wed, 01 Jun 2011 17:10:05 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jeff Garzik <jgarzik@...ox.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [035/165] libata: Use Maximum Write Same Length to report discard size

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------
 limit
Content-Length: 1118
Lines: 33

From: "Martin K. Petersen" <martin.petersen@...cle.com>

commit 5f4e206666f834340b69ddb43f86de3851c8675a upstream.

Previously we used Maximum Unmap LBA Count in the Block Limits VPD to
signal the maximum number of sectors we could handle in a single Write
Same command.

Starting with SBC3r26 the Block Limits VPD has an explicit limit on the
number of blocks in a Write Same. This means we can stop abusing a field
related to the Unmap command and let our SAT use the proper value in the
VPD (Maximum Write Same Length).

Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Jeff Garzik <jgarzik@...ox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/ata/libata-scsi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2139,7 +2139,7 @@ static unsigned int ata_scsiop_inq_b0(st
 	 * with the unmap bit set.
 	 */
 	if (ata_id_has_trim(args->id)) {
-		put_unaligned_be32(65535 * 512 / 8, &rbuf[20]);
+		put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
 		put_unaligned_be32(1, &rbuf[28]);
 	}

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