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[PATCH] mdio: mux: avoid 'maybe-uninitialized' warning

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  [PATCH] mdio: mux: avoid 'maybe-uninitialized' warning Arnd Bergmann <arnd@arndb.de> - 2016-06-14 12:10 +0200
    Re: [PATCH] mdio: mux: avoid 'maybe-uninitialized' warning Andrew Lunn <andrew@lunn.ch> - 2016-06-14 22:50 +0200
    Re: [PATCH] mdio: mux: avoid 'maybe-uninitialized' warning David Miller <davem@davemloft.net> - 2016-06-16 05:50 +0200

#1421730 — [PATCH] mdio: mux: avoid 'maybe-uninitialized' warning

The latest changes to the MDIO code introduced a false-positive
warning with gcc-6 (possibly others):

drivers/net/phy/mdio-mux.c: In function 'mdio_mux_init':
drivers/net/phy/mdio-mux.c:188:3: error: 'parent_bus_node' may be used uninitialized in this function [-Werror=maybe-uninitialized]

It's easy to avoid the warning by making sure the parent_bus_node
is initialized in both cases at the start of the function, since
the later 'of_node_put()' call is also valid for a NULL pointer
argument.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: f20e6657a875 ("mdio: mux: Enhanced MDIO mux framework for integrated multiplexers")
---
 drivers/net/phy/mdio-mux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index dbd4ecc205dc..963838d4fac1 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -115,6 +115,7 @@ int mdio_mux_init(struct device *dev,
 			goto err_parent_bus;
 		}
 	} else {
+		parent_bus_node = NULL;
 		parent_bus = mux_bus;
 	}
 
@@ -184,8 +185,7 @@ int mdio_mux_init(struct device *dev,
 	put_device(&pb->mii_bus->dev);
 
 err_parent_bus:
-	if (!mux_bus)
-		of_node_put(parent_bus_node);
+	of_node_put(parent_bus_node);
 	return ret_val;
 }
 EXPORT_SYMBOL_GPL(mdio_mux_init);
-- 
2.7.0

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#1422321

On Tue, Jun 14, 2016 at 12:03:17PM +0200, Arnd Bergmann wrote:
> The latest changes to the MDIO code introduced a false-positive
> warning with gcc-6 (possibly others):
> 
> drivers/net/phy/mdio-mux.c: In function 'mdio_mux_init':
> drivers/net/phy/mdio-mux.c:188:3: error: 'parent_bus_node' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> It's easy to avoid the warning by making sure the parent_bus_node
> is initialized in both cases at the start of the function, since
> the later 'of_node_put()' call is also valid for a NULL pointer
> argument.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: f20e6657a875 ("mdio: mux: Enhanced MDIO mux framework for integrated multiplexers")

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

Thanks Arnd

    Andrew

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#1423665

From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 14 Jun 2016 12:03:17 +0200

> The latest changes to the MDIO code introduced a false-positive
> warning with gcc-6 (possibly others):
> 
> drivers/net/phy/mdio-mux.c: In function 'mdio_mux_init':
> drivers/net/phy/mdio-mux.c:188:3: error: 'parent_bus_node' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> It's easy to avoid the warning by making sure the parent_bus_node
> is initialized in both cases at the start of the function, since
> the later 'of_node_put()' call is also valid for a NULL pointer
> argument.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: f20e6657a875 ("mdio: mux: Enhanced MDIO mux framework for integrated multiplexers")

Applied.

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