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Message-ID: <dcb57be8465c1aa21b21b8478290999f@dev.tdt.de>
Date: Wed, 18 Nov 2020 06:22:31 +0100
From: Martin Schiller <ms@....tdt.de>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3] net/tun: Call netdev notifiers
On 2020-11-18 01:32, Jakub Kicinski wrote:
> On Mon, 16 Nov 2020 11:41:21 +0100 Martin Schiller wrote:
>> Call netdev notifiers before and after changing the device type.
>>
>> Signed-off-by: Martin Schiller <ms@....tdt.de>
>> ---
>>
>> Change from v2:
>> use subject_prefix 'net-next' to fix 'fixes_present' issue
>>
>> Change from v1:
>> fix 'subject_prefix' and 'checkpatch' warnings
>>
>> ---
>> drivers/net/tun.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
>> index 3d45d56172cb..2d9a00f41023 100644
>> --- a/drivers/net/tun.c
>> +++ b/drivers/net/tun.c
>> @@ -3071,9 +3071,13 @@ static long __tun_chr_ioctl(struct file *file,
>> unsigned int cmd,
>> "Linktype set failed because interface is up\n");
>> ret = -EBUSY;
>> } else {
>> + call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
>> + tun->dev);
>
> This call may return an error (which has to be unpacked with
> notifier_to_errno()).
OK, I'll fix that and send a v3 patch.
>
>> tun->dev->type = (int) arg;
>> netif_info(tun, drv, tun->dev, "linktype set to %d\n",
>> tun->dev->type);
>> + call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
>> + tun->dev);
>> ret = 0;
>> }
>> break;
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