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SubjectRe: [PATCH] PCI: Remove duplicate pci_disable_device for pcie port
Hi Yinghai,
We should not remove this additional pci_disable_device().
Because we enable pcie port device twice before. The first is pci_enable_brides(),
in x86, it was called in pci_assign_unassigned_resources(). The second in pcie_port_device_register().
So we should call pci_disable_device() twice for pci_dev->enable_cnt balance.

But there is still a problem here. If we unbind a pcie port device pcie port driver, we can not
use its child devices again, because this pcie port device was disabled absolutely.

So I think we should move the second pci_disable_device() to remove.c.

I sent this patch to Bjorn and following is Bjorn reply
"And it's not clear to me whether unbinding the
pcie port driver should disable the bridge at all. I think one could
argue that the bridge should remain functional even if the driver is
unloaded, because the PCI core *enables* the bridge even if the driver
is never loaded."

Yinghai, how do you think about this issue?



On 2013/4/26 9:47, Yinghai Lu wrote:
> During chasing one PCI xHCI hotplug problem, David Bulkow found
>
> static void pcie_portdrv_remove(struct pci_dev *dev)
> {
> pcie_port_device_remove(dev);
> pci_disable_device(dev);
> }
> and
> void pcie_port_device_remove(struct pci_dev *dev)
> {
> device_for_each_child(&dev->dev, NULL, remove_iter);
> cleanup_service_irqs(dev);
> pci_disable_device(dev);
> }
>
> that extra pci_disable_device in pcie_port_device_remove() was added by
> | commit dc5351784eb36f1fec4efa88e01581be72c0b711
> | Author: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
> | Date: Wed Nov 25 21:04:00 2009 +0900
> |
> | PCI: portdrv: cleanup service irqs initialization
>
> so pci_dsiable_device is called two times.
>
> We should remove extra one in pcie_portdrv_remove.
>
> Reported-by: David Bulkow <David.Bulkow@stratus.com>
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
>
> ---
> drivers/pci/pcie/portdrv_pci.c | 1 -
> 1 file changed, 1 deletion(-)
>
> Index: linux-2.6/drivers/pci/pcie/portdrv_pci.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/pcie/portdrv_pci.c
> +++ linux-2.6/drivers/pci/pcie/portdrv_pci.c
> @@ -223,7 +223,6 @@ static int pcie_portdrv_probe(struct pci
> static void pcie_portdrv_remove(struct pci_dev *dev)
> {
> pcie_port_device_remove(dev);
> - pci_disable_device(dev);
> }
>
> static int error_detected_iter(struct device *device, void *data)
> --
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> .
>


--
Thanks!
Yijing
From 44914e0e39dbe51e1a932492d6b4909d5967308e Mon Sep 17 00:00:00 2001
From: Yijing Wang <wangyijing@huawei.com>
Date: Tue, 16 Apr 2013 11:41:47 +0800
Subject: [PATCH] PCI: move second pci_disable_device into pci_stop_bus_device() for symmetry

Currently, we enable and disable pcie port device is not symmetrical. If
we unbind the pcie port driver for pcie port device, we will call pci_disable_device()
twice. Then the pcie port device is disabled, if there are some child devices
under it, the child device maybe cannot transmit data anymore. This patch move the
second pci_disable_device() int pci_stop_bus_device() to avoid this bug.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
---
drivers/pci/pcie/portdrv_pci.c | 1 -
drivers/pci/remove.c | 1 +
2 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index ed4d094..2ca1a0b 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -223,7 +223,6 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
static void pcie_portdrv_remove(struct pci_dev *dev)
{
pcie_port_device_remove(dev);
- pci_disable_device(dev);
}

static int error_detected_iter(struct device *device, void *data)
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index cc875e6..e8f7c3c 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -73,6 +73,7 @@ static void pci_stop_bus_device(struct pci_dev *dev)
list_for_each_entry_safe_reverse(child, tmp,
&bus->devices, bus_list)
pci_stop_bus_device(child);
+ pci_disable_device(dev);
}

pci_stop_dev(dev);
--
1.7.1
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