From: Tejun Heo <htejun@gmail.com>
Date: Wed, 6 Jun 2007 07:35:55 +0000 (+0900)
Subject: libata: fix hw_sata_spd_limit initialization
X-Git-Tag: v2.6.22-rc5~52^2~10
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=afe3cc51ba4be6b25b721c40f178ea4157751161;p=linux-2.6

libata: fix hw_sata_spd_limit initialization

hw_sata_spd_limit used to be incorrectly initialized to zero instead
of UINT_MAX if SPD is zero in SControl register.  This breaks PHY
speed down.  Fix it.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index e7937166a8..bf8d3b8c17 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6317,7 +6317,8 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
 		/* init sata_spd_limit to the current value */
 		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
 			int spd = (scontrol >> 4) & 0xf;
-			ap->hw_sata_spd_limit &= (1 << spd) - 1;
+			if (spd)
+				ap->hw_sata_spd_limit &= (1 << spd) - 1;
 		}
 		ap->sata_spd_limit = ap->hw_sata_spd_limit;