linux-kernel - Re: [PATCH] net-sysfs: Report link speed as signed integer

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Message-ID: <20140602143557.GA2925@minipsycho.orion>
Date:	Mon, 2 Jun 2014 16:35:57 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Michal Privoznik <mprivozn@...hat.com>
Cc:	davem@...emloft.net, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net-sysfs: Report link speed as signed integer

Mon, Jun 02, 2014 at 04:25:15PM CEST, mprivozn@...hat.com wrote:
>The link speed is available at /sys/class/net/$nic/speed.
>However, the speed is printed in unsigned integer format. This
>makes userspace applications read an incorrect value (which
>moreover changes through several architectures) while in fact
>'-1' should be reported.
>
>Before the change:
>  # cat /sys/class/net/eth0/speed
>  4294967295
>
>After the change:
>  # cat /sys/class/net/eth0/speed
>  -1
>
>Signed-off-by: Michal Privoznik <mprivozn@...hat.com>
>---
> net/core/net-sysfs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
>index 1cac29e..99afdea 100644
>--- a/net/core/net-sysfs.c
>+++ b/net/core/net-sysfs.c
>@@ -173,7 +173,7 @@ static ssize_t speed_show(struct device *dev,
> 	if (netif_running(netdev)) {
> 		struct ethtool_cmd cmd;
> 		if (!__ethtool_get_settings(netdev, &cmd))
>-			ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
>+			ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));

I wonder why this should be signed. What -1 means? What driver reports
this?

> 	}
> 	rtnl_unlock();
> 	return ret;
>-- 
>2.0.0
>
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