[PATCH] net: cxgb3: Fix an error code when probing the driver

[PATCH] net: cxgb3: Fix an error code when probing the driver

[Zheyu Ma]

During the process of driver probing, probe function should return < 0
for failure, otherwise kernel will treat value >= 0 as success.

Therefore, the driver should set 'err' to -EINVAL when
'adapter->registered_device_map' is NULL. Otherwise kernel will assume
that the driver has been successfully probed and will cause unexpected
errors.

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
---
 drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
index bfffcaeee624..662af61fc723 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
@@ -3346,6 +3346,7 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 	if (!adapter->registered_device_map) {
 		dev_err(&pdev->dev, "could not register any net devices\n");
+		err = -EINVAL;
 		goto out_free_dev;
 	}
 
-- 
2.25.1

Re: [PATCH] net: cxgb3: Fix an error code when probing the driver

[Andrew Lunn]

On Sat, Mar 05, 2022 at 02:24:44PM +0000, Zheyu Ma wrote:
> During the process of driver probing, probe function should return < 0
> for failure, otherwise kernel will treat value >= 0 as success.
> 
> Therefore, the driver should set 'err' to -EINVAL when
> 'adapter->registered_device_map' is NULL. Otherwise kernel will assume
> that the driver has been successfully probed and will cause unexpected
> errors.
> 
> Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
> ---
>  drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
> index bfffcaeee624..662af61fc723 100644
> --- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
> +++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
> @@ -3346,6 +3346,7 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	}
>  	if (!adapter->registered_device_map) {
>  		dev_err(&pdev->dev, "could not register any net devices\n");
> +		err = -EINVAL;

ENODEV would be better.

       Andrew

[PATCH v2] net: cxgb3: Fix an error code when probing the driver

[Zheyu Ma]

During the process of driver probing, probe function should return < 0
for failure, otherwise kernel will treat value >= 0 as success.

Therefore, the driver should set 'err' to -ENODEV when
'adapter->registered_device_map' is NULL. Otherwise kernel will assume
that the driver has been successfully probed and will cause unexpected
errors.

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
---
Changes in v2:
    - Change the error code
---
 drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
index bfffcaeee624..0d3325cf2107 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
@@ -3346,6 +3346,7 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 	if (!adapter->registered_device_map) {
 		dev_err(&pdev->dev, "could not register any net devices\n");
+		err = -ENODEV;
 		goto out_free_dev;
 	}
 
-- 
2.25.1

Re: [PATCH v2] net: cxgb3: Fix an error code when probing the driver

[Andrew Lunn]

On Sun, Mar 06, 2022 at 05:56:32AM +0000, Zheyu Ma wrote:
> During the process of driver probing, probe function should return < 0
> for failure, otherwise kernel will treat value >= 0 as success.
> 
> Therefore, the driver should set 'err' to -ENODEV when
> 'adapter->registered_device_map' is NULL. Otherwise kernel will assume
> that the driver has been successfully probed and will cause unexpected
> errors.
> 
> Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>

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

    Andrew

Re: [PATCH v2] net: cxgb3: Fix an error code when probing the driver

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Sun,  6 Mar 2022 05:56:32 +0000 you wrote:
> During the process of driver probing, probe function should return < 0
> for failure, otherwise kernel will treat value >= 0 as success.
> 
> Therefore, the driver should set 'err' to -ENODEV when
> 'adapter->registered_device_map' is NULL. Otherwise kernel will assume
> that the driver has been successfully probed and will cause unexpected
> errors.
> 
> [...]

Here is the summary with links:
  - [v2] net: cxgb3: Fix an error code when probing the driver
    https://git.kernel.org/netdev/net-next/c/69adcb988a06

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html