Re: [PATCH] net: phy: Simplify the return expression of dp83640_ack_interrupt

On Fri, Jun 04, 2021 at 09:49:17AM +0200, Heiner Kallweit wrote:

On 04.06.2021 05:22, dingsenjie@163.com wrote:

quoted

From: dingsenjie <redacted>

Simplify the return expression.

Signed-off-by: dingsenjie <redacted>
---
 drivers/net/phy/dp83640.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 0d79f68..bcd14ec 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c

@@ -1141,12 +1141,7 @@ static int dp83640_config_init(struct phy_device *phydev)
 
 static int dp83640_ack_interrupt(struct phy_device *phydev)
 {
-	int err = phy_read(phydev, MII_DP83640_MISR);
-
-	if (err < 0)
-		return err;
-
-	return 0;
+	return phy_read(phydev, MII_DP83640_MISR);
 }
 
 static int dp83640_config_intr(struct phy_device *phydev)

This would be a functional change. You'd return a positive value
instead of 0.

And looking a bit further down in the code:

static int dp83640_ack_interrupt(struct phy_device *phydev)
{
        int err = phy_read(phydev, MII_DP83640_MISR);

        if (err < 0)
                return err;

        return 0;
}

static int dp83640_config_intr(struct phy_device *phydev)
{
        int micr;
        int misr;
        int err;

        if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
                err = dp83640_ack_interrupt(phydev);
                if (err)
                        return err;

So a positive value is going to break the driver.

NACK

	Andrew