[PATCH][next] net: dsa: sja1105: Fix assigned yet unused return code rc

From: Colin Ian King <redacted>

The return code variable rc is being set to return error values in two
places in sja1105_mdiobus_base_tx_register and yet it is not being
returned, the function always returns 0 instead. Fix this by replacing
the return 0 with the return code rc.

Addresses-Coverity: ("Unused value")
Fixes: 5a8f09748ee7 ("net: dsa: sja1105: register the MDIO buses for 100base-T1 and 100base-TX")
Signed-off-by: Colin Ian King <redacted>
---
 drivers/net/dsa/sja1105/sja1105_mdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_mdio.c b/drivers/net/dsa/sja1105/sja1105_mdio.c
index 8dfd06318b23..08517c70cb48 100644
--- a/drivers/net/dsa/sja1105/sja1105_mdio.c
+++ b/drivers/net/dsa/sja1105/sja1105_mdio.c

@@ -171,7 +171,7 @@ static int sja1105_mdiobus_base_tx_register(struct sja1105_private *priv,
 out_put_np:
 	of_node_put(np);
 
-	return 0;
+	return rc;
 }
 
 static void sja1105_mdiobus_base_tx_unregister(struct sja1105_private *priv)

-- 
2.31.1

On Wed, Jun 09, 2021 at 06:43:53PM +0100, Colin King wrote:

From: Colin Ian King <redacted>

The return code variable rc is being set to return error values in two
places in sja1105_mdiobus_base_tx_register and yet it is not being
returned, the function always returns 0 instead. Fix this by replacing
the return 0 with the return code rc.

Addresses-Coverity: ("Unused value")
Fixes: 5a8f09748ee7 ("net: dsa: sja1105: register the MDIO buses for 100base-T1 and 100base-TX")
Signed-off-by: Colin Ian King <redacted>
---

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>

Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Wed,  9 Jun 2021 18:43:53 +0100 you wrote:

From: Colin Ian King <redacted>

The return code variable rc is being set to return error values in two
places in sja1105_mdiobus_base_tx_register and yet it is not being
returned, the function always returns 0 instead. Fix this by replacing
the return 0 with the return code rc.

[...]

Here is the summary with links:
  - [next] net: dsa: sja1105: Fix assigned yet unused return code rc
    https://git.kernel.org/netdev/net-next/c/ab324d8dfdda

You are awesome, thank you!
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On Wed, Jun 09, 2021 at 06:43:53PM +0100, Colin King wrote:

Should this function really return success if of_device_is_available()?

regards,
dan carpenter

On Thu, Jun 10, 2021 at 09:23:58AM +0300, Dan Carpenter wrote:

On Wed, Jun 09, 2021 at 06:43:53PM +0100, Colin King wrote:

quoted

From: Colin Ian King <redacted>

The return code variable rc is being set to return error values in two
places in sja1105_mdiobus_base_tx_register and yet it is not being
returned, the function always returns 0 instead. Fix this by replacing
the return 0 with the return code rc.

Addresses-Coverity: ("Unused value")
Fixes: 5a8f09748ee7 ("net: dsa: sja1105: register the MDIO buses for 100base-T1 and 100base-TX")
Signed-off-by: Colin Ian King <redacted>
---
 drivers/net/dsa/sja1105/sja1105_mdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_mdio.c b/drivers/net/dsa/sja1105/sja1105_mdio.c
index 8dfd06318b23..08517c70cb48 100644
--- a/drivers/net/dsa/sja1105/sja1105_mdio.c
+++ b/drivers/net/dsa/sja1105/sja1105_mdio.c

@@ -171,7 +171,7 @@ static int sja1105_mdiobus_base_tx_register(struct sja1105_private *priv,
 out_put_np:
 	of_node_put(np);
 
-	return 0;
+	return rc;

Should this function really return success if of_device_is_available()?

If _not_ of_device_is_available you mean? Yup. Nothing wrong with not
having an internal MDIO bus. This is a driver which supports switches
that do and switches that don't, and even if the node exists, it may
have status = "disabled", which is again fine.
Or am I misunderstanding the question?

On Thu, Jun 10, 2021 at 08:51:24PM +0300, Vladimir Oltean wrote:

On Thu, Jun 10, 2021 at 09:23:58AM +0300, Dan Carpenter wrote:

quoted

On Wed, Jun 09, 2021 at 06:43:53PM +0100, Colin King wrote:

quoted

From: Colin Ian King <redacted>

The return code variable rc is being set to return error values in two
places in sja1105_mdiobus_base_tx_register and yet it is not being
returned, the function always returns 0 instead. Fix this by replacing
the return 0 with the return code rc.

Addresses-Coverity: ("Unused value")
Fixes: 5a8f09748ee7 ("net: dsa: sja1105: register the MDIO buses for 100base-T1 and 100base-TX")
Signed-off-by: Colin Ian King <redacted>
---
 drivers/net/dsa/sja1105/sja1105_mdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_mdio.c b/drivers/net/dsa/sja1105/sja1105_mdio.c
index 8dfd06318b23..08517c70cb48 100644
--- a/drivers/net/dsa/sja1105/sja1105_mdio.c
+++ b/drivers/net/dsa/sja1105/sja1105_mdio.c

@@ -171,7 +171,7 @@ static int sja1105_mdiobus_base_tx_register(struct sja1105_private *priv,
 out_put_np:
 	of_node_put(np);
 
-	return 0;
+	return rc;

Should this function really return success if of_device_is_available()?

If _not_ of_device_is_available you mean? Yup. Nothing wrong with not
having an internal MDIO bus. This is a driver which supports switches
that do and switches that don't, and even if the node exists, it may
have status = "disabled", which is again fine.
Or am I misunderstanding the question?

Yeah.  I left out the "!".  That answers the question.  Thanks!

regards,
dan carpenter