netdev - [PATCH 05/05] r8169: prevent bit sign expansion error in mdio

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Message-ID: <20071108231222.GF15968@electric-eye.fr.zoreil.com>
Date:	Fri, 9 Nov 2007 00:12:22 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	jgarzik@...ox.com
Cc:	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Mark Lord <mlord@...ox.com>,
	Ciaran McCreesh <ciaran.mccreesh@...eyonder.co.uk>,
	Josh Logan <joshtlogan@...il.com>,
	cecco <f.cecco77@...cali.it>,
	Hans-Jurgen Koch <hjk@...utronix.de>,
	David Gundersen <gundy@...et.net.au>,
	Will Trives <will@...vescon.com.au>,
	"Alexander Y. Fomichev" <gluk@...4.ru>,
	Rolf Eike Beer <eike-kernel@...tec.de>,
	Daniel Drake <dsd@...too.org>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Philip Craig <philipc@...pgear.com>,
	Edward Hsu <edward_hsu@...ltek.com.tw>
Subject: [PATCH 05/05] r8169: prevent bit sign expansion error in mdio_write

Oops.

The current code does not like being given an u16 with the highest
bit set as an argument to mdio_write. Let's enforce a correct range of
values for both the register address and value (resp. 5 and 16 bits).

The callers are currently left as-is.

Signed-off-by: Francois Romieu <romieu@...zoreil.com>
Cc: Edward Hsu <edward_hsu@...ltek.com.tw>
---
 drivers/net/r8169.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index f9ba2e4..1f647b9 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -470,7 +470,7 @@ static void mdio_write(void __iomem *ioaddr, int reg_addr, int value)
 {
 	int i;
 
-	RTL_W32(PHYAR, 0x80000000 | (reg_addr & 0xFF) << 16 | value);
+	RTL_W32(PHYAR, 0x80000000 | (reg_addr & 0x1f) << 16 | (value & 0xffff));
 
 	for (i = 20; i > 0; i--) {
 		/*
@@ -487,7 +487,7 @@ static int mdio_read(void __iomem *ioaddr, int reg_addr)
 {
 	int i, value = -1;
 
-	RTL_W32(PHYAR, 0x0 | (reg_addr & 0xFF) << 16);
+	RTL_W32(PHYAR, 0x0 | (reg_addr & 0x1f) << 16);
 
 	for (i = 20; i > 0; i--) {
 		/*
@@ -495,7 +495,7 @@ static int mdio_read(void __iomem *ioaddr, int reg_addr)
 		 * the specified MII register.
 		 */
 		if (RTL_R32(PHYAR) & 0x80000000) {
-			value = (int) (RTL_R32(PHYAR) & 0xFFFF);
+			value = RTL_R32(PHYAR) & 0xffff;
 			break;
 		}
 		udelay(25);
-- 
1.5.3.3

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