linux-kernel - [PATCH] of: of_mdio: Fix some endianness problems.

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Date:	Wed, 27 Oct 2010 18:03:47 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	devicetree-discuss@...ts.ozlabs.org, grant.likely@...retlab.ca,
	linux-kernel@...r.kernel.org
Cc:	David Daney <ddaney@...iumnetworks.com>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Dan Carpenter <error27@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH] of: of_mdio: Fix some endianness problems.

In of_mdiobus_register(), the __be32 *addr variable is dereferenced.
This will not work on little-endian targets.  Also since it is
unsigned, checking for less than zero is redundant.

Fix these two issues.

Signed-off-by: David Daney <ddaney@...iumnetworks.com>
Cc: Grant Likely <grant.likely@...retlab.ca>
Cc: Jeremy Kerr <jeremy.kerr@...onical.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Dan Carpenter <error27@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/of/of_mdio.c |   23 ++++++++++++++---------
 1 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 1fce00e..b370306 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -52,27 +52,32 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 
 	/* Loop over the child nodes and register a phy_device for each one */
 	for_each_child_of_node(np, child) {
-		const __be32 *addr;
+		const __be32 *paddr;
+		u32 addr;
 		int len;
 
 		/* A PHY must have a reg property in the range [0-31] */
-		addr = of_get_property(child, "reg", &len);
-		if (!addr || len < sizeof(*addr) || *addr >= 32 || *addr < 0) {
+		paddr = of_get_property(child, "reg", &len);
+		if (!paddr || len < sizeof(*paddr)) {
+addr_err:
 			dev_err(&mdio->dev, "%s has invalid PHY address\n",
 				child->full_name);
 			continue;
 		}
+		addr = be32_to_cpup(paddr);
+		if (addr >= 32)
+			goto addr_err;
 
 		if (mdio->irq) {
-			mdio->irq[*addr] = irq_of_parse_and_map(child, 0);
-			if (!mdio->irq[*addr])
-				mdio->irq[*addr] = PHY_POLL;
+			mdio->irq[addr] = irq_of_parse_and_map(child, 0);
+			if (!mdio->irq[addr])
+				mdio->irq[addr] = PHY_POLL;
 		}
 
-		phy = get_phy_device(mdio, be32_to_cpup(addr));
+		phy = get_phy_device(mdio, addr);
 		if (!phy || IS_ERR(phy)) {
 			dev_err(&mdio->dev, "error probing PHY at address %i\n",
-				*addr);
+				addr);
 			continue;
 		}
 		phy_scan_fixups(phy);
@@ -91,7 +96,7 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 		}
 
 		dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
-			child->name, *addr);
+			child->name, addr);
 	}
 
 	return 0;
-- 
1.7.2.3

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