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Date: Thu, 25 Sep 2014 13:59:26 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Liviu Dudau <Liviu.Dudau@....com>, Arnd Bergmann <arnd@...db.de>,
Rob Herring <robh+dt@...nel.org>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <Will.Deacon@....com>,
Russell King <linux@....linux.org.uk>,
linux-pci <linux-pci@...r.kernel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Tanmay Inamdar <tinamdar@....com>,
Grant Likely <grant.likely@...retlab.ca>,
Sinan Kaya <okaya@...eaurora.org>,
Jingoo Han <jg1.han@...sung.com>,
Kukjin Kim <kgene.kim@...sung.com>,
Suravee Suthikulanit <suravee.suthikulpanit@....com>,
linux-arch <linux-arch@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Device Tree ML <devicetree@...r.kernel.org>,
LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v12 06/12] PCI: Create pci_host_bridge before its
associated bus in pci_create_root_bus.
On Thu, Sep 25, 2014 at 12:15 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Tue, Sep 23, 2014 at 12:01 PM, Liviu Dudau <Liviu.Dudau@....com> wrote:
>> Before commit 7b5436635800 the pci_host_bridge was created before the root bus.
>> As that commit has added a needless dependency on the bus for pci_alloc_host_bridge()
>> the creation order has been changed for no good reason. Revert the order of
>> creation as we are going to depend on the pci_host_bridge structure to retrieve the
>> domain number of the root bus.
>>
>> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
>> Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
>> Acked-by: Grant Likely <grant.likely@...aro.org>
>> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
>> Tested-by: Tanmay Inamdar <tinamdar@....com>
>> ---
>> drivers/pci/probe.c | 32 +++++++++++++++++---------------
>> 1 file changed, 17 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index e3cf8a2..5ff72ec 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -515,7 +515,7 @@ static void pci_release_host_bridge_dev(struct device *dev)
>> kfree(bridge);
>> }
>>
>> -static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
>> +static struct pci_host_bridge *pci_alloc_host_bridge(void)
>> {
>> struct pci_host_bridge *bridge;
>>
>> @@ -524,7 +524,8 @@ static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
>> return NULL;
>>
>> INIT_LIST_HEAD(&bridge->windows);
>> - bridge->bus = b;
>> + bridge->dev.release = pci_release_host_bridge_dev;
>> +
>> return bridge;
>> }
>>
>> @@ -1761,9 +1762,15 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>> char bus_addr[64];
>> char *fmt;
>>
>> + bridge = pci_alloc_host_bridge();
>> + if (!bridge)
>> + return NULL;
>> +
>> + bridge->dev.parent = parent;
>> +
>> b = pci_alloc_bus();
>> if (!b)
>> - return NULL;
>> + goto err_out;
>>
>> b->sysdata = sysdata;
>> b->ops = ops;
>> @@ -1772,26 +1779,19 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>> if (b2) {
>> /* If we already got to this bus through a different bridge, ignore it */
>> dev_dbg(&b2->dev, "bus already known\n");
>> - goto err_out;
>> + goto err_bus_out;
>> }
>>
>> - bridge = pci_alloc_host_bridge(b);
>> - if (!bridge)
>> - goto err_out;
>> -
>> - bridge->dev.parent = parent;
>> - bridge->dev.release = pci_release_host_bridge_dev;
>> + bridge->bus = b;
>> dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
>> error = pcibios_root_bridge_prepare(bridge);
>> - if (error) {
>> - kfree(bridge);
>> + if (error)
>> goto err_out;
>> - }
>>
>> error = device_register(&bridge->dev);
>> if (error) {
>> put_device(&bridge->dev);
>> - goto err_out;
>> + goto err_bus_out;
>> }
>> b->bridge = get_device(&bridge->dev);
>> device_enable_async_suspend(b->bridge);
>> @@ -1848,8 +1848,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>> class_dev_reg_err:
>> put_device(&bridge->dev);
>> device_unregister(&bridge->dev);
>> -err_out:
>> +err_bus_out:
>> kfree(b);
>> +err_out:
>> + kfree(bridge);
>> return NULL;
>> }
>
> Hi Bjorn,
>
> Noticed that you put this one into pci/next.
>
> This patch has problem for the class_dev_reg_err path.
> as device_unregister(&bridge->dev) will trigger pci_release_host_bridge_dev.
> So will have double free for bridge or else.
>
> Please drop this patch from pci/next.
>
> Also looks strange that the patch have long CC list, but just omit me
> and Jiang Liu that
> touched those code before.
Thanks for noticing that. I was concerned, but couldn't remember the details.
I dropped this patch and the subsequent ones from pci/host and rebased
my "next" branch.
Sorry I didn't notice you weren't on the CC list.
Bjorn
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