From: Bjorn Helgaas <bhelgaas@google.com>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Jesse Barnes <jbarnes@virtuousgeek.org>,
Yinghai Lu <yinghai@kernel.org>,
"Ronciak, John" <john.ronciak@intel.com>,
"Penner, Miles J" <miles.j.penner@intel.com>,
Bruce Allan <bruce.w.allan@intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH 1/6] PCI: acpiphp: do not check for SLOT_ENABLED in enable_device()
Date: Wed, 26 Jun 2013 17:28:30 -0600 [thread overview]
Message-ID: <CAErSpo4Ks+8PPvpscWZE7LrRd-daOzV-kJi6Oim42A+nZnp3HQ@mail.gmail.com> (raw)
In-Reply-To: <1372177330-28013-2-git-send-email-mika.westerberg@linux.intel.com>
On Tue, Jun 25, 2013 at 10:22 AM, Mika Westerberg
<mika.westerberg@linux.intel.com> wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> With Thunderbolt you can chain devices: connect a new devices to plugged
> one. In this case the slot is already enabled, but we still want to look
> for new devices behind it.
>
> We're going to reuse enable_device() for rescan for new devices on the
> enabled slot. Let's push the check up by stack.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> ---
> drivers/pci/hotplug/acpiphp_glue.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
> index 59df857..b983e29 100644
> --- a/drivers/pci/hotplug/acpiphp_glue.c
> +++ b/drivers/pci/hotplug/acpiphp_glue.c
> @@ -688,9 +688,6 @@ static int __ref enable_device(struct acpiphp_slot *slot)
> int num, max, pass;
> LIST_HEAD(add_list);
>
> - if (slot->flags & SLOT_ENABLED)
> - goto err_exit;
> -
> list_for_each_entry(func, &slot->funcs, sibling)
> acpiphp_bus_add(func);
>
> @@ -1242,6 +1239,8 @@ int acpiphp_enable_slot(struct acpiphp_slot *slot)
> goto err_exit;
>
> if (get_slot_status(slot) == ACPI_STA_ALL) {
> + if (slot->flags & SLOT_ENABLED)
> + goto err_exit;
Why do we check for SLOT_ENABLED at all? I think we're handling a Bus
Check notification, which means "re-enumerate on the device tree
starting from the notification point." It doesn't say anything about
skipping the re-enumeration if we find a device that's already
enabled.
It seems like we ought to just re-enumerate all the way down in case a
device was added farther down in the tree (which is what it sounds
like Thunderbolt is doing).
> /* configure all functions */
> retval = enable_device(slot);
> if (retval)
> --
> 1.8.3.1
>
next prev parent reply other threads:[~2013-06-26 23:28 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-25 16:22 [PATCH 0/6] Thunderbolt workarounds take 2 Mika Westerberg
2013-06-25 16:22 ` [PATCH 1/6] PCI: acpiphp: do not check for SLOT_ENABLED in enable_device() Mika Westerberg
2013-06-26 23:28 ` Bjorn Helgaas [this message]
2013-06-27 13:25 ` Kirill A. Shutemov
2013-06-28 9:51 ` Kirill A. Shutemov
2013-06-28 17:00 ` Bjorn Helgaas
2013-06-28 18:54 ` Rafael J. Wysocki
2013-07-01 9:32 ` Mika Westerberg
2013-07-01 14:01 ` Rafael J. Wysocki
2013-07-01 18:36 ` Mika Westerberg
2013-07-02 1:29 ` Rafael J. Wysocki
2013-07-02 16:40 ` Bjorn Helgaas
2013-07-02 20:29 ` Rafael J. Wysocki
2013-07-02 20:31 ` Mika Westerberg
2013-07-02 20:49 ` Rafael J. Wysocki
2013-06-25 16:22 ` [PATCH 2/6] PCI: acpiphp: enable_device(): rescan even if no new devices on slot Mika Westerberg
2013-06-26 23:37 ` Bjorn Helgaas
2013-06-27 13:02 ` Mika Westerberg
2013-06-27 16:32 ` Mika Westerberg
2013-06-27 16:50 ` Bjorn Helgaas
2013-06-27 16:54 ` Bjorn Helgaas
2013-06-27 1:20 ` Yinghai Lu
2013-06-27 13:04 ` Mika Westerberg
2013-06-25 16:22 ` [PATCH 3/6] PCI: introduce pci_trim_stale_devices() Mika Westerberg
2013-06-25 17:47 ` Andy Shevchenko
2013-06-25 17:56 ` Kirill A. Shutemov
2013-06-28 19:59 ` Rafael J. Wysocki
2013-06-25 16:22 ` [PATCH 4/6] PCI: acpiphp: check for new devices on enabled host Mika Westerberg
2013-06-25 18:04 ` Andy Shevchenko
2013-06-26 9:39 ` Kirill A. Shutemov
2013-06-27 19:05 ` Yinghai Lu
2013-06-28 9:33 ` Kirill A. Shutemov
2013-06-28 16:22 ` Yinghai Lu
2013-06-28 20:04 ` Rafael J. Wysocki
2013-06-25 16:22 ` [PATCH 5/6] PCI: acpiphp: look _RMV method a bit deeper in the hierarhcy Mika Westerberg
2013-06-25 18:15 ` Andy Shevchenko
2013-06-25 18:31 ` Mika Westerberg
2013-06-25 18:31 ` Andy Shevchenko
2013-06-25 18:51 ` Mika Westerberg
2013-06-25 19:30 ` Andy Shevchenko
2013-07-02 10:44 ` Kirill A. Shutemov
2013-07-02 17:09 ` Bjorn Helgaas
2013-07-02 17:45 ` Kirill A. Shutemov
2013-07-02 20:48 ` Rafael J. Wysocki
2013-07-02 20:40 ` Rafael J. Wysocki
2013-06-25 16:22 ` [PATCH 6/6] x86/PCI: quirk Thunderbolt PCI-to-PCI bridges Mika Westerberg
2013-06-25 21:15 ` Jesse Barnes
2013-06-26 12:17 ` Mika Westerberg
2013-06-26 15:04 ` Greg Kroah-Hartman
2013-06-26 20:59 ` Bjorn Helgaas
2013-06-26 22:15 ` Alex Williamson
2013-06-27 13:09 ` Mika Westerberg
2013-06-26 22:18 ` Bjorn Helgaas
2013-06-26 22:26 ` Yinghai Lu
2013-06-26 22:31 ` Yinghai Lu
2013-06-26 22:44 ` Rafael J. Wysocki
2013-06-26 22:38 ` Yinghai Lu
2013-06-26 22:55 ` Bjorn Helgaas
2013-06-26 23:56 ` Yinghai Lu
2013-06-27 16:00 ` Bjorn Helgaas
2013-06-27 17:27 ` Yinghai Lu
2013-06-27 13:58 ` Mika Westerberg
2013-06-27 13:54 ` Mika Westerberg
2013-06-27 16:27 ` Mika Westerberg
2013-06-27 17:18 ` Yinghai Lu
2013-06-25 23:24 ` [PATCH 0/6] Thunderbolt workarounds take 2 Rafael J. Wysocki
2013-06-26 7:25 ` Mika Westerberg
2013-06-26 12:45 ` Rafael J. Wysocki
2013-06-26 19:48 ` Bjorn Helgaas
2013-06-26 20:01 ` Rafael J. Wysocki
2013-06-26 19:55 ` Bjorn Helgaas
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