linux-kernel - [010/205] r8169: fix mdio_read and update mdio

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 30 Jul 2010 10:50:27 -0700
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,
	Timo TerÃ€s <timo.teras@....fi>,
	Francois Romieu <romieu@...zoreil.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [010/205] r8169: fix mdio_read and update mdio_write according to hw specs

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

------------------


From: Timo Teräs <timo.teras@....fi>

[ Upstream commit 81a95f049962ec20a9aed888e676208b206f0f2e ]

Realtek confirmed that a 20us delay is needed after mdio_read and
mdio_write operations. Reduce the delay in mdio_write, and add it
to mdio_read too. Also add a comment that the 20us is from hw specs.

Signed-off-by: Timo Teräs <timo.teras@....fi>
Acked-by: Francois Romieu <romieu@...zoreil.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/net/r8169.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -558,10 +558,10 @@ static void mdio_write(void __iomem *ioa
 		udelay(25);
 	}
 	/*
-	 * Some configurations require a small delay even after the write
-	 * completed indication or the next write might fail.
+	 * According to hardware specs a 20us delay is required after write
+	 * complete indication, but before sending next command.
 	 */
-	udelay(25);
+	udelay(20);
 }
 
 static int mdio_read(void __iomem *ioaddr, int reg_addr)
@@ -581,6 +581,12 @@ static int mdio_read(void __iomem *ioadd
 		}
 		udelay(25);
 	}
+	/*
+	 * According to hardware specs a 20us delay is required after read
+	 * complete indication, but before sending next command.
+	 */
+	udelay(20);
+
 	return value;
 }
 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/