[PATCH v2 0/5] net: mdio-mux: Misc fix

[PATCH v2 0/5] net: mdio-mux: Misc fix

[Corentin Labbe]

Hello

This patch series fix minor problems found when working on the
dwmac-sun8i syscon mdio-mux.

Regards

Changes since v1:
- Removed obsolete comment about of_mdio_find_bus/put_device
- removed more DRV_VERSION

Corentin Labbe (5):
  net: mdio-mux: Fix NULL Comparison style
  net: mdio-mux: Remove unnecessary 'out of memory' message
  net: mdio-mux: printing driver version is useless
  net: mdio-mux-mmioreg: Can handle 8/16/32 bits registers
  net: mdio-mux: fix unbalanced put_device

 drivers/net/phy/Kconfig    |  2 +-
 drivers/net/phy/mdio-mux.c | 19 ++++---------------
 2 files changed, 5 insertions(+), 16 deletions(-)

-- 
2.13.5

[PATCH v2 1/5] net: mdio-mux: Fix NULL Comparison style

[Corentin Labbe]

This patch fix checkpatch warning about NULL Comparison style.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 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 942ceaf3fd3f..b18ad7082b88 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -120,7 +120,7 @@ int mdio_mux_init(struct device *dev,
 	}
 
 	pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
-	if (pb == NULL) {
+	if (!pb) {
 		ret_val = -ENOMEM;
 		goto err_pb_kz;
 	}
@@ -144,7 +144,7 @@ int mdio_mux_init(struct device *dev,
 		}
 
 		cb = devm_kzalloc(dev, sizeof(*cb), GFP_KERNEL);
-		if (cb == NULL) {
+		if (!cb) {
 			dev_err(dev,
 				"Error: Failed to allocate memory for child %pOF\n",
 				child_bus_node);
-- 
2.13.5

[PATCH v2 2/5] net: mdio-mux: Remove unnecessary 'out of memory' message

[Corentin Labbe]

This patch fix checkpatch warning about unnecessary 'out of memory'
message.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/phy/mdio-mux.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index b18ad7082b88..5e08e89465c5 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -145,9 +145,6 @@ int mdio_mux_init(struct device *dev,
 
 		cb = devm_kzalloc(dev, sizeof(*cb), GFP_KERNEL);
 		if (!cb) {
-			dev_err(dev,
-				"Error: Failed to allocate memory for child %pOF\n",
-				child_bus_node);
 			ret_val = -ENOMEM;
 			continue;
 		}
@@ -156,9 +153,6 @@ int mdio_mux_init(struct device *dev,
 
 		cb->mii_bus = mdiobus_alloc();
 		if (!cb->mii_bus) {
-			dev_err(dev,
-				"Error: Failed to allocate MDIO bus for child %pOF\n",
-				child_bus_node);
 			ret_val = -ENOMEM;
 			devm_kfree(dev, cb);
 			continue;
-- 
2.13.5

[PATCH v2 3/5] net: mdio-mux: printing driver version is useless

[Corentin Labbe]

Remove the driver version information because this information
is not useful in an upstream kernel driver.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
---
 drivers/net/phy/mdio-mux.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index 5e08e89465c5..282828551bdd 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -13,7 +13,6 @@
 #include <linux/module.h>
 #include <linux/phy.h>
 
-#define DRV_VERSION "1.0"
 #define DRV_DESCRIPTION "MDIO bus multiplexer driver"
 
 struct mdio_mux_child_bus;
@@ -179,7 +178,6 @@ int mdio_mux_init(struct device *dev,
 	}
 	if (pb->children) {
 		*mux_handle = pb;
-		dev_info(dev, "Version " DRV_VERSION "\n");
 		return 0;
 	}
 
@@ -212,6 +210,5 @@ void mdio_mux_uninit(void *mux_handle)
 EXPORT_SYMBOL_GPL(mdio_mux_uninit);
 
 MODULE_DESCRIPTION(DRV_DESCRIPTION);
-MODULE_VERSION(DRV_VERSION);
 MODULE_AUTHOR("David Daney");
 MODULE_LICENSE("GPL");
-- 
2.13.5

[PATCH v2 4/5] net: mdio-mux-mmioreg: Can handle 8/16/32 bits registers

[Corentin Labbe]

This patch fix an old information that mdio-mux-mmioreg can only handle
8bit registers.
This is not true anymore.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/phy/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 5afe6fdcc968..a9d16a3af514 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -85,7 +85,7 @@ config MDIO_BUS_MUX_MMIOREG
 	  parent bus.  Child bus selection is under the control of one of
 	  the FPGA's registers.
 
-	  Currently, only 8-bit registers are supported.
+	  Currently, only 8/16/32 bits registers are supported.
 
 config MDIO_CAVIUM
 	tristate
-- 
2.13.5

[PATCH v2 5/5] net: mdio-mux: fix unbalanced put_device

[Corentin Labbe]

mdio_mux_uninit() call put_device (unconditionally) because of
of_mdio_find_bus() in mdio_mux_init.
But of_mdio_find_bus is only called if mux_bus is empty.
If mux_bus is set, mdio_mux_uninit will print a "refcount_t: underflow"
trace.

This patch add a get_device in the other branch of "if (mux_bus)".

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
---
 drivers/net/phy/mdio-mux.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index 282828551bdd..6f75e9f27fed 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -116,6 +116,7 @@ int mdio_mux_init(struct device *dev,
 	} else {
 		parent_bus_node = NULL;
 		parent_bus = mux_bus;
+		get_device(&parent_bus->dev);
 	}
 
 	pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
@@ -184,9 +185,7 @@ int mdio_mux_init(struct device *dev,
 	dev_err(dev, "Error: No acceptable child buses found\n");
 	devm_kfree(dev, pb);
 err_pb_kz:
-	/* balance the reference of_mdio_find_bus() took */
-	if (!mux_bus)
-		put_device(&parent_bus->dev);
+	put_device(&parent_bus->dev);
 err_parent_bus:
 	of_node_put(parent_bus_node);
 	return ret_val;
@@ -204,7 +203,6 @@ void mdio_mux_uninit(void *mux_handle)
 		cb = cb->next;
 	}
 
-	/* balance the reference of_mdio_find_bus() in mdio_mux_init() took */
 	put_device(&pb->mii_bus->dev);
 }
 EXPORT_SYMBOL_GPL(mdio_mux_uninit);
-- 
2.13.5

Re: [PATCH v2 3/5] net: mdio-mux: printing driver version is useless

[Andrew Lunn]

On Fri, Sep 01, 2017 at 01:56:02PM +0200, Corentin Labbe wrote:
> Remove the driver version information because this information
> is not useful in an upstream kernel driver.
> 
> Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>

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

    Andrew

Re: [PATCH v2 5/5] net: mdio-mux: fix unbalanced put_device

[Andrew Lunn]

On Fri, Sep 01, 2017 at 01:56:04PM +0200, Corentin Labbe wrote:
> mdio_mux_uninit() call put_device (unconditionally) because of
> of_mdio_find_bus() in mdio_mux_init.
> But of_mdio_find_bus is only called if mux_bus is empty.
> If mux_bus is set, mdio_mux_uninit will print a "refcount_t: underflow"
> trace.
> 
> This patch add a get_device in the other branch of "if (mux_bus)".
> 
> Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>

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

    Andrew

Re: [PATCH v2 0/5] net: mdio-mux: Misc fix

[David Miller]

From: Corentin Labbe <clabbe.montjoie@gmail.com>
Date: Fri,  1 Sep 2017 13:55:59 +0200

> This patch series fix minor problems found when working on the
> dwmac-sun8i syscon mdio-mux.
 ...
> Changes since v1:
> - Removed obsolete comment about of_mdio_find_bus/put_device
> - removed more DRV_VERSION

Series applied to net-next.