netdev - Re: [PATCH] 9p: disconnect channel when PCI device is removed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 15 Apr 2012 17:57:26 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Sasha Levin <levinsasha928@...il.com>, davem@...emloft.net,
	ericvh@...il.com, jvrao@...ux.vnet.ibm.com, rusty@...tcorp.com.au
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	davej@...hat.com, Sasha Levin <levinsasha928@...il.com>
Subject: Re: [PATCH] 9p: disconnect channel when PCI device is removed

Sasha Levin <levinsasha928@...il.com> writes:

> When a virtio_9p pci device is being removed, we should close down any
> active channels and free up resources, we're not supposed to BUG() if there's
> still an open channel since it's a valid case when removing the PCI device.
>
> Otherwise, removing the PCI device with an open channel would cause the
> following BUG():
>
...

> diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
> index 3d43206..5af18d1 100644
> --- a/net/9p/trans_virtio.c
> +++ b/net/9p/trans_virtio.c
> @@ -615,7 +615,8 @@ static void p9_virtio_remove(struct virtio_device *vdev)
>  {
>  	struct virtio_chan *chan = vdev->priv;
>
> -	BUG_ON(chan->inuse);
> +	if (chan->inuse)
> +		p9_virtio_close(chan->client);
>  	vdev->config->del_vqs(vdev);
>
>  	mutex_lock(&virtio_9p_lock);

But an umount should have resulted in p9_virtio_close ? How are you
removing the device ? Are you removing the device with file system
mounted  ?. In that case may be we should return EBUSY ?

-aneesh

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html