Update `lan78xx_phy_wait_not_busy` to forward errors from
`lan78xx_read_reg` instead of overwriting them with `-EIO`. Replace
`-EIO` with `-ETIMEDOUT` for timeout cases, providing more specific and
appropriate error codes.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/usb/lan78xx.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index fdeb95db529b..9852526be002 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -961,14 +961,14 @@ static int lan78xx_phy_wait_not_busy(struct lan78xx_net *dev)
 
 	do {
 		ret = lan78xx_read_reg(dev, MII_ACC, &val);
-		if (unlikely(ret < 0))
-			return -EIO;
+		if (ret < 0)
+			return ret;
 
 		if (!(val & MII_ACC_MII_BUSY_))
 			return 0;
 	} while (!time_after(jiffies, start_time + HZ));
 
-	return -EIO;
+	return -ETIMEDOUT;
 }
 
 static inline u32 mii_access(int id, int index, int read)
-- 
2.39.5

On Mon, Dec 09, 2024 at 02:07:49PM +0100, Oleksij Rempel wrote:
> Update `lan78xx_phy_wait_not_busy` to forward errors from
> `lan78xx_read_reg` instead of overwriting them with `-EIO`. Replace
> `-EIO` with `-ETIMEDOUT` for timeout cases, providing more specific and
> appropriate error codes.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  drivers/net/usb/lan78xx.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
> index fdeb95db529b..9852526be002 100644
> --- a/drivers/net/usb/lan78xx.c
> +++ b/drivers/net/usb/lan78xx.c
> @@ -961,14 +961,14 @@ static int lan78xx_phy_wait_not_busy(struct lan78xx_net *dev)
>  
>  	do {
>  		ret = lan78xx_read_reg(dev, MII_ACC, &val);
> -		if (unlikely(ret < 0))
> -			return -EIO;
> +		if (ret < 0)
> +			return ret;
>  
>  		if (!(val & MII_ACC_MII_BUSY_))
>  			return 0;
>  	} while (!time_after(jiffies, start_time + HZ));
>  
> -	return -EIO;
> +	return -ETIMEDOUT;

It would be better to replace this with an iopoll.h helper.

However, the change you made is O.K.

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

    Andrew