linux-kernel - [PATCH 20/31] scsi: use parity32 in isci/phy.c

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Date:	Sun, 27 Mar 2016 15:20:51 +0800
From:	"zhaoxiu.zeng" <zhaoxiu.zeng@...il.com>
To:	Intel SCU Linux support <intel-linux-scu@...el.com>,
	Artur Paszkiewicz <artur.paszkiewicz@...el.com>,
	"James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: [PATCH 20/31] scsi: use parity32 in isci/phy.c

From: Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>

Signed-off-by: Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>
---
 drivers/scsi/isci/phy.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/isci/phy.c b/drivers/scsi/isci/phy.c
index cb87b2e..0b87ff4 100644
--- a/drivers/scsi/isci/phy.c
+++ b/drivers/scsi/isci/phy.c
@@ -122,8 +122,6 @@ sci_phy_link_layer_initialization(struct isci_phy *iphy,
 	int phy_idx = iphy->phy_index;
 	struct sci_phy_cap phy_cap;
 	u32 phy_configuration;
-	u32 parity_check = 0;
-	u32 parity_count = 0;
 	u32 llctl, link_rate;
 	u32 clksm_value = 0;
 	u32 sp_timeouts = 0;
@@ -223,19 +221,11 @@ sci_phy_link_layer_initialization(struct isci_phy *iphy,
 	}
 
 	/* The SAS specification indicates that the phy_capabilities that
-	 * are transmitted shall have an even parity.  Calculate the parity.
+	 * are transmitted shall have an even parity. If parity indicates
+	 * there are an odd number of bits set, then set the parity bit
+	 * to 1 in the phy capabilities.
 	 */
-	parity_check = phy_cap.all;
-	while (parity_check != 0) {
-		if (parity_check & 0x1)
-			parity_count++;
-		parity_check >>= 1;
-	}
-
-	/* If parity indicates there are an odd number of bits set, then
-	 * set the parity bit to 1 in the phy capabilities.
-	 */
-	if ((parity_count % 2) != 0)
+	if (parity32(phy_cap.all))
 		phy_cap.parity = 1;
 
 	writel(phy_cap.all, &llr->phy_capabilities);
-- 
2.5.5