[PATCH v2] net: lan9303: Fix read error execution path

[PATCH v2] net: lan9303: Fix read error execution path

[Jerry Ray]

This patch fixes an issue where a read failure of a port statistic counter
will return unknown results.  While it is highly unlikely the read will
ever fail, it is much cleaner to return a zero for the stat count.

Fixes: a1292595e006 ("net: dsa: add new DSA switch driver for the SMSC-LAN9303")
Signed-off-by: Jerry Ray <jerry.ray@microchip.com>
---
v1->v2:
  corrected email header: net vs net-next, Added 1 maintainer, removed
  blank line.
  No changes to the body of the patch.
---
 drivers/net/dsa/lan9303-core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 80f07bd20593..2e270b479143 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -1005,9 +1005,11 @@ static void lan9303_get_ethtool_stats(struct dsa_switch *ds, int port,
 		ret = lan9303_read_switch_port(
 			chip, port, lan9303_mib[u].offset, &reg);
 
-		if (ret)
+		if (ret) {
 			dev_warn(chip->dev, "Reading status port %d reg %u failed\n",
 				 port, lan9303_mib[u].offset);
+			reg = 0;
+		}
 		data[u] = reg;
 	}
 }
-- 
2.17.1

Re: [PATCH v2] net: lan9303: Fix read error execution path

[Vladimir Oltean]

On Fri, Dec 09, 2022 at 09:35:02AM -0600, Jerry Ray wrote:
> This patch fixes an issue where a read failure of a port statistic counter
> will return unknown results.  While it is highly unlikely the read will
> ever fail, it is much cleaner to return a zero for the stat count.
> 
> Fixes: a1292595e006 ("net: dsa: add new DSA switch driver for the SMSC-LAN9303")
> Signed-off-by: Jerry Ray <jerry.ray@microchip.com>
> ---
> v1->v2:
>   corrected email header: net vs net-next, Added 1 maintainer, removed
>   blank line.

Actually it's not "net vs net-next", but rather, "nothing vs net-next".
As you can see, the patchwork CI complains that "Target tree name [is]
not specified in the subject".
https://patchwork.kernel.org/project/netdevbpf/patch/20221209153502.7429-1-jerry.ray@microchip.com/

Anyway, I think it's quite obvious for maintainers that it's a patch
intended for the net.git tree, so there isn't a reason to resend this
patch, just something to know and to do better in the future.

>   No changes to the body of the patch.
> ---

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>

Re: [PATCH v2] net: lan9303: Fix read error execution path

[Florian Fainelli]

On 12/9/22 07:35, Jerry Ray wrote:
> This patch fixes an issue where a read failure of a port statistic counter
> will return unknown results.  While it is highly unlikely the read will
> ever fail, it is much cleaner to return a zero for the stat count.
> 
> Fixes: a1292595e006 ("net: dsa: add new DSA switch driver for the SMSC-LAN9303")
> Signed-off-by: Jerry Ray <jerry.ray@microchip.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH v2] net: lan9303: Fix read error execution path

[patchwork-bot+netdevbpf]

Hello:

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

On Fri, 9 Dec 2022 09:35:02 -0600 you wrote:
> This patch fixes an issue where a read failure of a port statistic counter
> will return unknown results.  While it is highly unlikely the read will
> ever fail, it is much cleaner to return a zero for the stat count.
> 
> Fixes: a1292595e006 ("net: dsa: add new DSA switch driver for the SMSC-LAN9303")
> Signed-off-by: Jerry Ray <jerry.ray@microchip.com>
> 
> [...]

Here is the summary with links:
  - [v2] net: lan9303: Fix read error execution path
    https://git.kernel.org/netdev/net/c/8964916d2060

You are awesome, thank you!
-- 
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