[PATCH] dev_ioctl should return -EINVAL for unknown ioctl instead of -ENOTTY

[PATCH] dev_ioctl should return -EINVAL for unknown ioctl instead of -ENOTTY

[Wang Sheng-Hui]

The patch is against 3.1-rc3.

Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
---
 net/core/dev.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 17d67b5..de6033c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5092,7 +5092,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 		/* Take care of Wireless Extensions */
 		if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
 			return wext_handle_ioctl(net, &ifr, cmd, arg);
-		return -ENOTTY;
+		return -EINVAL;
 	}
 }
 
-- 
1.7.1

Re: [PATCH] dev_ioctl should return -EINVAL for unknown ioctl instead of -ENOTTY

[Ben Hutchings]

On Thu, 2011-09-01 at 22:52 +0800, Wang Sheng-Hui wrote:
> The patch is against 3.1-rc3.
> 
> Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
> ---
>  net/core/dev.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 17d67b5..de6033c 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -5092,7 +5092,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
>  		/* Take care of Wireless Extensions */
>  		if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
>  			return wext_handle_ioctl(net, &ifr, cmd, arg);
> -		return -ENOTTY;
> +		return -EINVAL;
>  	}
>  }
>  

Whereas, Linus Torvalds wrote in
<BANLkTin=PTbTwBR2s+owMLy+GmKigeoYvg@mail.gmail.com>:
[...]
> The correct error code for "I don't understand this ioctl" is ENOTTY.
> The naming may be odd, but you should think of that error value as a
> "unrecognized ioctl number, you're feeding me random numbers that I
> don't understand and I assume for historical reasons that you tried to
> do some tty operation on me".
[...]

(Not that we are consistent about using ENOTTY in networking now.)

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

Re: [PATCH] dev_ioctl should return -EINVAL for unknown ioctl instead of -ENOTTY

[Wang Sheng-Hui]

On 2011年09月01日 23:41, Ben Hutchings wrote:
> On Thu, 2011-09-01 at 22:52 +0800, Wang Sheng-Hui wrote:
>> The patch is against 3.1-rc3.
>>
>> Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
>> ---
>>  net/core/dev.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index 17d67b5..de6033c 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -5092,7 +5092,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
>>  		/* Take care of Wireless Extensions */
>>  		if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
>>  			return wext_handle_ioctl(net, &ifr, cmd, arg);
>> -		return -ENOTTY;
>> +		return -EINVAL;
>>  	}
>>  }
>>  
> 
> Whereas, Linus Torvalds wrote in
> <BANLkTin=PTbTwBR2s+owMLy+GmKigeoYvg@mail.gmail.com>:
> [...]
>> The correct error code for "I don't understand this ioctl" is ENOTTY.
>> The naming may be odd, but you should think of that error value as a
>> "unrecognized ioctl number, you're feeding me random numbers that I
>> don't understand and I assume for historical reasons that you tried to
>> do some tty operation on me".
> [...]
> 
> (Not that we are consistent about using ENOTTY in networking now.)
> 
> Ben.
> 

Got it. Thanks.