From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Keith Busch <keith.busch@intel.com>
Cc: Sinan Kaya <okaya@kernel.org>,
poza@codeaurora.org, Bjorn Helgaas <helgaas@kernel.org>,
Thomas Tai <thomas.tai@oracle.com>,
bhelgaas@google.com, linux-pci@vger.kernel.org,
linux-pci-owner@vger.kernel.org,
Sam Bobroff <sam.bobroff@au1.ibm.com>
Subject: Re: [PATCH 1/1] PCI/AER: prevent pcie_do_fatal_recovery from using device after it is removed
Date: Tue, 21 Aug 2018 08:19:52 +1000 [thread overview]
Message-ID: <cae46bea2b02153d8d6661182b0111d32e8396b9.camel@kernel.crashing.org> (raw)
In-Reply-To: <20180820221351.GA16932@localhost.localdomain>
On Mon, 2018-08-20 at 16:13 -0600, Keith Busch wrote:
>
> There might be some potential here.
>
> There actualy is a Slot Status Presence Detect State (PDS), but it isn't
> latched. The link and presence change (PDC) are latched.
>
> A potential problem may be a PDC event handling observes PDS set to the
> last known state if the remove + add happens fast enough, and then no
> action is taken in the current implementation.
>
> The DPC capability learned from such issues, and they will latch the
> status until acknowledged so those sorts of races are not possible.
>
> But anyway, maybe we can change pciehp to ignore PDS and always
> re-enumerate when PDC is observed, and that may very well simplify a lot
> of this.
That sounds reasonable to me.
Cheers,
Ben.
next prev parent reply other threads:[~2018-08-20 22:19 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-13 16:51 [PATCH 0/1] PCI/AER: prevent pcie_do_fatal_recovery from using device after it is removed Thomas Tai
2018-08-13 16:51 ` [PATCH 1/1] " Thomas Tai
2018-08-14 9:16 ` poza
2018-08-14 9:22 ` poza
2018-08-14 13:51 ` Thomas Tai
2018-08-15 14:57 ` poza
2018-08-15 15:02 ` Thomas Tai
2018-08-15 15:26 ` poza
2018-08-15 15:43 ` Thomas Tai
2018-08-15 15:59 ` poza
2018-08-15 16:04 ` Thomas Tai
2018-08-15 21:55 ` Benjamin Herrenschmidt
2018-08-15 21:56 ` Benjamin Herrenschmidt
2018-08-16 6:36 ` poza
2018-08-16 6:51 ` Benjamin Herrenschmidt
2018-08-16 6:59 ` Benjamin Herrenschmidt
2018-08-16 8:07 ` poza
2018-08-16 8:12 ` Benjamin Herrenschmidt
2018-08-16 9:03 ` poza
2018-08-16 10:07 ` Benjamin Herrenschmidt
2018-08-16 14:11 ` poza
2018-08-16 23:30 ` Benjamin Herrenschmidt
2018-08-17 10:29 ` poza
2018-08-17 10:44 ` poza
2018-08-18 7:38 ` Benjamin Herrenschmidt
2018-08-16 7:05 ` Benjamin Herrenschmidt
2018-08-16 7:15 ` Benjamin Herrenschmidt
2018-08-16 7:56 ` poza
2018-08-16 8:10 ` Benjamin Herrenschmidt
2018-08-16 8:05 ` poza
2018-08-16 8:15 ` Benjamin Herrenschmidt
2018-08-16 8:22 ` poza
2018-08-16 8:28 ` Benjamin Herrenschmidt
2018-08-16 13:30 ` Thomas Tai
2018-08-16 13:46 ` Sinan Kaya
2018-08-16 23:27 ` Benjamin Herrenschmidt
2018-08-17 6:35 ` poza
2018-08-19 2:24 ` Bjorn Helgaas
2018-08-20 5:09 ` poza
2018-08-20 5:15 ` Benjamin Herrenschmidt
2018-08-20 13:02 ` Thomas Tai
2018-08-20 13:27 ` Benjamin Herrenschmidt
2018-08-19 2:19 ` Bjorn Helgaas
2018-08-19 21:41 ` Sinan Kaya
2018-08-20 2:03 ` Benjamin Herrenschmidt
2018-08-20 5:19 ` poza
2018-08-20 5:33 ` Benjamin Herrenschmidt
2018-08-20 7:56 ` poza
2018-08-20 11:22 ` Benjamin Herrenschmidt
2018-08-20 13:26 ` poza
2018-08-20 21:02 ` Benjamin Herrenschmidt
2018-08-21 5:14 ` poza
2018-08-21 6:06 ` Benjamin Herrenschmidt
2018-08-21 14:37 ` Keith Busch
2018-08-21 15:07 ` Sinan Kaya
2018-08-21 15:29 ` Keith Busch
2018-08-21 15:50 ` Sinan Kaya
2018-08-21 15:55 ` Sinan Kaya
2018-08-21 16:44 ` Keith Busch
2018-08-21 15:30 ` poza
2018-08-21 21:14 ` Benjamin Herrenschmidt
2018-08-21 22:04 ` Keith Busch
2018-08-21 22:33 ` Keith Busch
2018-08-21 23:06 ` Benjamin Herrenschmidt
2018-08-21 23:13 ` Keith Busch
2018-08-22 0:36 ` Benjamin Herrenschmidt
2018-08-30 0:01 ` Keith Busch
2018-08-30 0:10 ` Sinan Kaya
2018-08-30 0:46 ` Keith Busch
2018-08-30 4:26 ` Benjamin Herrenschmidt
2018-08-20 15:53 ` Keith Busch
2018-08-20 16:13 ` poza
2018-08-20 16:32 ` Keith Busch
2018-08-20 21:05 ` Benjamin Herrenschmidt
2018-08-20 21:21 ` Sinan Kaya
2018-08-20 21:35 ` Keith Busch
2018-08-20 21:53 ` Benjamin Herrenschmidt
2018-08-20 22:02 ` Sinan Kaya
2018-08-20 22:04 ` Benjamin Herrenschmidt
2018-08-20 22:13 ` Sinan Kaya
2018-08-20 22:19 ` Benjamin Herrenschmidt
2018-08-22 9:13 ` Lukas Wunner
2018-08-22 14:38 ` Keith Busch
2018-08-22 14:51 ` Sinan Kaya
2018-08-20 22:13 ` Keith Busch
2018-08-20 22:19 ` Benjamin Herrenschmidt [this message]
2018-08-21 1:30 ` Keith Busch
2018-08-20 4:37 ` Benjamin Herrenschmidt
2018-08-20 4:39 ` PATCH] Partial revert of "PCI/AER: Handle ERR_FATAL with removal and re-enumeration of devices" Benjamin Herrenschmidt
2018-08-21 19:50 ` Bjorn Helgaas
2018-08-22 4:35 ` poza
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