From: Bjorn Helgaas <helgaas@kernel.org>
To: Daniel Stodden <dns@arista.com>
Cc: Kurt Schwemmer <kurt.schwemmer@microsemi.com>,
Logan Gunthorpe <logang@deltatee.com>,
linux-pci@vger.kernel.org
Subject: Re: [PATCH v3] switchtec: Fix stdev_release crash after suprise device loss.
Date: Tue, 21 Nov 2023 12:40:08 -0600 [thread overview]
Message-ID: <20231121184008.GA249064@bhelgaas> (raw)
In-Reply-To: <BDEC1856-B689-433B-9227-4CCA5969C2F2@arista.com>
On Tue, Nov 21, 2023 at 10:23:51AM -0800, Daniel Stodden wrote:
> > On Nov 20, 2023, at 1:25 PM, Bjorn Helgaas <helgaas@kernel.org> wrote:
> > On Mon, Nov 13, 2023 at 01:21:50PM -0800, Daniel Stodden wrote:
> >> A pci device hot removal may occur while stdev->cdev is held open. The
> >> call to stdev_release is then delivered during close or exit, at a
> >> point way past switchtec_pci_remove. Otherwise the last ref would
> >> vanish with the trailing put_device, just before return.
> >>
> >> At that later point in time, the device layer has alreay removed
> >> stdev->mrpc_mmio map. Also, the stdev->pdev reference was not a
> >
> > I guess this should say the "stdev->mmio_mrpc" (not "mrpc_mmio")?
>
> Eww. My fault. Could you still correct that?
Yep, I speculatively made that change already, so thanks for
confirming it :)
https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/commit/?h=switchtec&id=f9724598e29d
Bjorn
next prev parent reply other threads:[~2023-11-21 18:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-13 21:21 [PATCH v3 0/1] switchtec: Fix stdev_release crash after suprise device loss Daniel Stodden
2023-11-13 21:21 ` [PATCH v3] " Daniel Stodden
2023-11-20 21:25 ` Bjorn Helgaas
2023-11-21 18:23 ` Daniel Stodden
2023-11-21 18:40 ` Bjorn Helgaas [this message]
2023-11-21 23:58 ` Daniel Stodden
2023-11-22 0:02 ` Daniel Stodden
2023-11-22 0:39 ` Bjorn Helgaas
2023-11-22 0:19 ` Bjorn Helgaas
2023-11-22 0:25 ` Dmitry Safonov
2023-11-22 0:37 ` Bjorn Helgaas
2023-11-22 0:37 ` Dmitry Safonov
2023-11-22 0:41 ` Bjorn Helgaas
2023-11-22 1:02 ` Daniel Stodden
2023-11-22 3:16 ` Bjorn Helgaas
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