Refactor qca808x cable test get status function to remove code
duplication and clean things up.

The same logic is applied to each pair hence it can be generalized and
moved to a common function.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/net/phy/at803x.c | 65 +++++++++++++++++++++-------------------
 1 file changed, 34 insertions(+), 31 deletions(-)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index acf483fa0887..b87293ee736c 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -2037,10 +2037,39 @@ static int qca808x_cable_test_start(struct phy_device *phydev)
 	return 0;
 }
 
+static void qca808x_cable_test_get_pair_status(struct phy_device *phydev, u8 pair,
+					       u16 status)
+{
+	u16 pair_code;
+	int length;
+
+	switch (pair) {
+	case ETHTOOL_A_CABLE_PAIR_A:
+		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_A, status);
+		break;
+	case ETHTOOL_A_CABLE_PAIR_B:
+		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_B, status);
+		break;
+	case ETHTOOL_A_CABLE_PAIR_C:
+		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_C, status);
+		break;
+	case ETHTOOL_A_CABLE_PAIR_D:
+		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_D, status);
+		break;
+	}
+
+	ethnl_cable_test_result(phydev, pair,
+				qca808x_cable_test_result_trans(pair_code));
+
+	if (qca808x_cdt_fault_length_valid(pair_code)) {
+		length = qca808x_cdt_fault_length(phydev, pair);
+		ethnl_cable_test_fault_length(phydev, pair, length);
+	}
+}
+
 static int qca808x_cable_test_get_status(struct phy_device *phydev, bool *finished)
 {
 	int ret, val;
-	int pair_a, pair_b, pair_c, pair_d;
 
 	*finished = false;
 
@@ -2059,36 +2088,10 @@ static int qca808x_cable_test_get_status(struct phy_device *phydev, bool *finish
 	if (val < 0)
 		return val;
 
-	pair_a = FIELD_GET(QCA808X_CDT_CODE_PAIR_A, val);
-	pair_b = FIELD_GET(QCA808X_CDT_CODE_PAIR_B, val);
-	pair_c = FIELD_GET(QCA808X_CDT_CODE_PAIR_C, val);
-	pair_d = FIELD_GET(QCA808X_CDT_CODE_PAIR_D, val);
-
-	ethnl_cable_test_result(phydev, ETHTOOL_A_CABLE_PAIR_A,
-				qca808x_cable_test_result_trans(pair_a));
-	ethnl_cable_test_result(phydev, ETHTOOL_A_CABLE_PAIR_B,
-				qca808x_cable_test_result_trans(pair_b));
-	ethnl_cable_test_result(phydev, ETHTOOL_A_CABLE_PAIR_C,
-				qca808x_cable_test_result_trans(pair_c));
-	ethnl_cable_test_result(phydev, ETHTOOL_A_CABLE_PAIR_D,
-				qca808x_cable_test_result_trans(pair_d));
-
-	if (qca808x_cdt_fault_length_valid(pair_a)) {
-		val = qca808x_cdt_fault_length(phydev, ETHTOOL_A_CABLE_PAIR_A);
-		ethnl_cable_test_fault_length(phydev, ETHTOOL_A_CABLE_PAIR_A, val);
-	}
-	if (qca808x_cdt_fault_length_valid(pair_b)) {
-		val = qca808x_cdt_fault_length(phydev, ETHTOOL_A_CABLE_PAIR_B);
-		ethnl_cable_test_fault_length(phydev, ETHTOOL_A_CABLE_PAIR_B, val);
-	}
-	if (qca808x_cdt_fault_length_valid(pair_c)) {
-		val = qca808x_cdt_fault_length(phydev, ETHTOOL_A_CABLE_PAIR_C);
-		ethnl_cable_test_fault_length(phydev, ETHTOOL_A_CABLE_PAIR_C, val);
-	}
-	if (qca808x_cdt_fault_length_valid(pair_d)) {
-		val = qca808x_cdt_fault_length(phydev, ETHTOOL_A_CABLE_PAIR_D);
-		ethnl_cable_test_fault_length(phydev, ETHTOOL_A_CABLE_PAIR_D, val);
-	}
+	qca808x_cable_test_get_pair_status(phydev, ETHTOOL_A_CABLE_PAIR_A, val);
+	qca808x_cable_test_get_pair_status(phydev, ETHTOOL_A_CABLE_PAIR_B, val);
+	qca808x_cable_test_get_pair_status(phydev, ETHTOOL_A_CABLE_PAIR_C, val);
+	qca808x_cable_test_get_pair_status(phydev, ETHTOOL_A_CABLE_PAIR_D, val);
 
 	*finished = true;
 
-- 
2.43.0

On Wed, Jan 03, 2024 at 01:46:33PM +0100, Christian Marangi wrote:
> Refactor qca808x cable test get status function to remove code
> duplication and clean things up.
> 
> The same logic is applied to each pair hence it can be generalized and
> moved to a common function.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> ---
>  drivers/net/phy/at803x.c | 65 +++++++++++++++++++++-------------------
>  1 file changed, 34 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index acf483fa0887..b87293ee736c 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -2037,10 +2037,39 @@ static int qca808x_cable_test_start(struct phy_device *phydev)
>  	return 0;
>  }
>  
> +static void qca808x_cable_test_get_pair_status(struct phy_device *phydev, u8 pair,
> +					       u16 status)
> +{
> +	u16 pair_code;
> +	int length;
> +
> +	switch (pair) {
> +	case ETHTOOL_A_CABLE_PAIR_A:
> +		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_A, status);
> +		break;
> +	case ETHTOOL_A_CABLE_PAIR_B:
> +		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_B, status);
> +		break;
> +	case ETHTOOL_A_CABLE_PAIR_C:
> +		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_C, status);
> +		break;
> +	case ETHTOOL_A_CABLE_PAIR_D:
> +		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_D, status);
> +		break;
> +	}

Hi Christian,

I don't think this can actually happen given current usage,
but if pair doesn't match one of the cases above,
then pair_code is used uninitialised below.

Flagged by Smatch.

> +
> +	ethnl_cable_test_result(phydev, pair,
> +				qca808x_cable_test_result_trans(pair_code));
> +
> +	if (qca808x_cdt_fault_length_valid(pair_code)) {
> +		length = qca808x_cdt_fault_length(phydev, pair);
> +		ethnl_cable_test_fault_length(phydev, pair, length);
> +	}
> +}
> +
>  static int qca808x_cable_test_get_status(struct phy_device *phydev, bool *finished)
>  {
>  	int ret, val;
> -	int pair_a, pair_b, pair_c, pair_d;
>  
>  	*finished = false;
>  

...

On Thu, Jan 04, 2024 at 01:03:37PM +0000, Simon Horman wrote:
> On Wed, Jan 03, 2024 at 01:46:33PM +0100, Christian Marangi wrote:
> > Refactor qca808x cable test get status function to remove code
> > duplication and clean things up.
> > 
> > The same logic is applied to each pair hence it can be generalized and
> > moved to a common function.
> > 
> > Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> > ---
> >  drivers/net/phy/at803x.c | 65 +++++++++++++++++++++-------------------
> >  1 file changed, 34 insertions(+), 31 deletions(-)
> > 
> > diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> > index acf483fa0887..b87293ee736c 100644
> > --- a/drivers/net/phy/at803x.c
> > +++ b/drivers/net/phy/at803x.c
> > @@ -2037,10 +2037,39 @@ static int qca808x_cable_test_start(struct phy_device *phydev)
> >  	return 0;
> >  }
> >  
> > +static void qca808x_cable_test_get_pair_status(struct phy_device *phydev, u8 pair,
> > +					       u16 status)
> > +{
> > +	u16 pair_code;
> > +	int length;
> > +
> > +	switch (pair) {
> > +	case ETHTOOL_A_CABLE_PAIR_A:
> > +		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_A, status);
> > +		break;
> > +	case ETHTOOL_A_CABLE_PAIR_B:
> > +		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_B, status);
> > +		break;
> > +	case ETHTOOL_A_CABLE_PAIR_C:
> > +		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_C, status);
> > +		break;
> > +	case ETHTOOL_A_CABLE_PAIR_D:
> > +		pair_code = FIELD_GET(QCA808X_CDT_CODE_PAIR_D, status);
> > +		break;
> > +	}
> 
> Hi Christian,
> 
> I don't think this can actually happen given current usage,
> but if pair doesn't match one of the cases above,
> then pair_code is used uninitialised below.
> 
> Flagged by Smatch.
>

In theory it would trigger a warning for the switch case not handled?

But yes I will add a default case.

> > +
> > +	ethnl_cable_test_result(phydev, pair,
> > +				qca808x_cable_test_result_trans(pair_code));
> > +
> > +	if (qca808x_cdt_fault_length_valid(pair_code)) {
> > +		length = qca808x_cdt_fault_length(phydev, pair);
> > +		ethnl_cable_test_fault_length(phydev, pair, length);
> > +	}
> > +}
> > +
> >  static int qca808x_cable_test_get_status(struct phy_device *phydev, bool *finished)
> >  {
> >  	int ret, val;
> > -	int pair_a, pair_b, pair_c, pair_d;
> >  
> >  	*finished = false;
> >  
> 
> ...

-- 
	Ansuel