From: "Michael S. Tsirkin" <mst@redhat.com>
To: Jack Morgenstein <jackm@dev.mellanox.co.il>
Cc: Tejun Heo <tj@kernel.org>, Or Gerlitz <ogerlitz@mellanox.com>,
Ming Lei <ming.lei@canonical.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
David Miller <davem@davemloft.net>,
Roland Dreier <roland@kernel.org>,
netdev <netdev@vger.kernel.org>, Yan Burman <yanb@mellanox.com>,
Bjorn Helgaas <bhelgaas@google.com>,
linux-pci@vger.kernel.org
Subject: Re: [PATCH repost for-3.9] pci: avoid work_on_cpu for nested SRIOV probes
Date: Thu, 18 Apr 2013 11:48:32 +0300 [thread overview]
Message-ID: <20130418084832.GA16728@redhat.com> (raw)
In-Reply-To: <201304181240.10239.jackm@dev.mellanox.co.il>
On Thu, Apr 18, 2013 at 12:40:09PM +0300, Jack Morgenstein wrote:
> On Thursday 18 April 2013 11:33, Michael S. Tsirkin wrote:
> > But for pci_sriov_enable, the situation is actually very simple:
> > VFs almost never use the same driver as the PF so the warning
> > is bogus there.
> >
> What about the case where the VF driver IS the same as the PF driver?
Then it can deadlock, e.g. if driver takes a global mutex. But it's an
internal driver issue the, you can trigger a deadlock through hardware
too, e.g. if VF initialization blocks until PF is fully initialized.
I think it's not the case for Mellanox, is it?
This is what I refer to: would be nice to fix nested probing in general
but it seems disabling the warning is the best we can do for 3.9 since
it causes false positives.
--
MST
next prev parent reply other threads:[~2013-04-18 9:47 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-11 15:30 [PATCH repost for-3.9] pci: avoid work_on_cpu for nested SRIOV probes Michael S. Tsirkin
2013-04-11 18:05 ` Tejun Heo
2013-04-11 18:58 ` Michael S. Tsirkin
2013-04-11 19:04 ` Tejun Heo
2013-04-11 19:17 ` Michael S. Tsirkin
2013-04-11 19:20 ` Tejun Heo
2013-04-11 20:30 ` Michael S. Tsirkin
2013-04-11 20:41 ` Tejun Heo
2013-04-11 21:52 ` Or Gerlitz
2013-04-14 12:58 ` Or Gerlitz
2013-04-14 13:43 ` Tejun Heo
2013-04-18 8:33 ` Michael S. Tsirkin
2013-04-18 9:40 ` Jack Morgenstein
2013-04-18 8:48 ` Michael S. Tsirkin [this message]
2013-04-18 9:57 ` Jack Morgenstein
2013-04-18 14:49 ` Or Gerlitz
2013-04-18 13:54 ` Michael S. Tsirkin
2013-04-18 18:19 ` Tejun Heo
2013-04-18 18:25 ` Bjorn Helgaas
2013-04-18 20:11 ` Michael S. Tsirkin
2013-04-18 18:41 ` Or Gerlitz
2013-04-18 20:03 ` Michael S. Tsirkin
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