From: Philip Pokorny <ppokorny@penguincomputing.com>
Date: Sat, 28 May 2005 08:24:47 +0000 (-0700)
Subject: [PATCH] libata fix read capacity handling for more than 2TB
X-Git-Tag: v2.6.13-rc1~51^2~41^2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0c144d0d0303917000cc918e63567b5ded22d5e2;p=linux-2.6

[PATCH] libata fix read capacity handling for more than 2TB

This is a multi-part message in MIME format.
---

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 7a4adc4c8f..794fb559ef 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -1176,8 +1176,12 @@ unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
 		n_sectors = ata_id_u32(args->id, 60);
 	n_sectors--;		/* ATA TotalUserSectors - 1 */
 
-	tmp = n_sectors;	/* note: truncates, if lba48 */
 	if (args->cmd->cmnd[0] == READ_CAPACITY) {
+		if( n_sectors >= 0xffffffffULL )
+			tmp = 0xffffffff ;  /* Return max count on overflow */
+		else
+			tmp = n_sectors ;
+
 		/* sector count, 32-bit */
 		rbuf[0] = tmp >> (8 * 3);
 		rbuf[1] = tmp >> (8 * 2);
@@ -1191,10 +1195,12 @@ unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
 
 	} else {
 		/* sector count, 64-bit */
-		rbuf[2] = n_sectors >> (8 * 7);
-		rbuf[3] = n_sectors >> (8 * 6);
-		rbuf[4] = n_sectors >> (8 * 5);
-		rbuf[5] = n_sectors >> (8 * 4);
+		tmp = n_sectors >> (8 * 4);
+		rbuf[2] = tmp >> (8 * 3);
+		rbuf[3] = tmp >> (8 * 2);
+		rbuf[4] = tmp >> (8 * 1);
+		rbuf[5] = tmp;
+		tmp = n_sectors;
 		rbuf[6] = tmp >> (8 * 3);
 		rbuf[7] = tmp >> (8 * 2);
 		rbuf[8] = tmp >> (8 * 1);