From: Bjorn Helgaas <bhelgaas@google.com>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Tony Luck <tony.luck@intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org
Subject: Re: [PATCH 10/13] PCI: Strict checking of valid range for bridge
Date: Mon, 30 Jan 2012 08:04:39 -0800 [thread overview]
Message-ID: <CAErSpo7RsR+2gDJvWic4ta-_SWfUwECaVxRrCVnTFZyFG5RCkw@mail.gmail.com> (raw)
In-Reply-To: <1327718971-9598-11-git-send-email-yinghai@kernel.org>
On Fri, Jan 27, 2012 at 6:49 PM, Yinghai Lu <yinghai@kernel.org> wrote:
> children bridges busn range should be able to be allocated from parent bus range.
>
> to avoid overlapping between sibling bridges on same bus.
>
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
> ---
> drivers/pci/probe.c | 27 +++++++++++++++++++++++++++
> 1 files changed, 27 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 83df3fb..e12f65f0 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -791,6 +791,33 @@ reduce_needed_size:
> return ret;
> }
>
> +static int __devinit pci_bridge_check_busn_res(struct pci_bus *bus,
> + struct pci_dev *dev,
> + int secondary, int subordinate)
This function returns a boolean, but the function name doesn't give
any clue about what a true/false return means. Something like
"busn_valid" would make the callers more readable.
> +{
> + int broken = 0;
> +
> + struct resource busn_res;
> + int ret;
> +
> + memset(&busn_res, 0, sizeof(struct resource));
> + dev_printk(KERN_DEBUG, &dev->dev,
> + "check if busn %02x-%02x is in busn_res: %06llx-%06llx\n",
> + secondary, subordinate,
> + (unsigned long long)bus->busn_res.start,
> + (unsigned long long)bus->busn_res.end);
> + ret = allocate_resource(&bus->busn_res, &busn_res,
> + (subordinate - secondary + 1),
> + (pci_domain_nr(bus)<<8) | secondary,
> + (pci_domain_nr(bus)<<8) | subordinate,
I think this "(pci_domain_nr(bus)<<8) | secondary" stuff needs to be a
macro or something.
> + 1, NULL, NULL);
> + if (ret)
> + broken = 1;
> + else
> + release_resource(&busn_res);
> +
> + return broken;
> +}
> /*
> * If it's a bridge, configure it and scan the bus behind it.
> * For CardBus bridges, we don't scan behind as the devices will
> --
> 1.7.7
>
next prev parent reply other threads:[~2012-01-30 16:05 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-28 2:49 [PATCH -v2 0/13] PCI: allocate pci bus num range for unassigned bridge busn Yinghai Lu
2012-01-28 2:49 ` [PATCH 01/13] PCI: Add iobusn_resource Yinghai Lu
2012-01-28 2:49 ` [PATCH 02/13] PCI: Add busn_res operation functions Yinghai Lu
2012-01-30 15:28 ` Bjorn Helgaas
2012-01-30 18:32 ` Yinghai Lu
2012-01-28 2:49 ` [PATCH 03/13] PCI: Add busn_res tracking in core Yinghai Lu
2012-01-30 15:35 ` Bjorn Helgaas
2012-01-30 18:39 ` Yinghai Lu
2012-01-28 2:49 ` [PATCH 04/13] PCI, x86: Register busn_res for root buses Yinghai Lu
2012-01-28 2:49 ` [PATCH 05/13] PCI, ia64: " Yinghai Lu
2012-01-28 2:49 ` [PATCH 06/13] PCI, powerpc: " Yinghai Lu
2012-01-30 15:44 ` Bjorn Helgaas
2012-01-28 2:49 ` [PATCH 07/13] PCI, parisc: " Yinghai Lu
2012-01-28 2:49 ` [PATCH 08/13] PCI: Add pci_bus_extend/shrink_top() Yinghai Lu
2012-01-30 15:50 ` Bjorn Helgaas
2012-01-30 18:42 ` Yinghai Lu
2012-01-28 2:49 ` [PATCH 09/13] PCI: Probe safe range that we can use for unassigned bridge Yinghai Lu
2012-01-30 15:59 ` Bjorn Helgaas
2012-01-30 18:51 ` Yinghai Lu
2012-01-28 2:49 ` [PATCH 10/13] PCI: Strict checking of valid range for bridge Yinghai Lu
2012-01-30 16:04 ` Bjorn Helgaas [this message]
2012-01-30 18:52 ` Yinghai Lu
2012-01-28 2:49 ` [PATCH 11/13] PCI: Allocate bus range instead of use max blindly Yinghai Lu
2012-01-28 2:49 ` [PATCH 12/13] PCI: kill pci_fixup_parent_subordinate_busnr() Yinghai Lu
2012-01-30 16:09 ` Bjorn Helgaas
2012-01-28 2:49 ` [PATCH 13/13] PCI: Seperate child bus scanning to two passes overall Yinghai Lu
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