[PATCH 2/2] PCI: iproc: add bcma pcie driver
zajec5 at gmail.com
Wed May 13 09:19:41 PDT 2015
On 13 May 2015 at 17:56, Ray Jui <rjui at broadcom.com> wrote:
> On 5/12/2015 11:27 PM, Rafał Miłecki wrote:
>> On 12 May 2015 at 23:23, Hauke Mehrtens <hauke at hauke-m.de> wrote:
>>> This driver adds support for the PCIe 2.0 controller found on the bcma
>>> bus. This controller can be found on (mostly) all Broadcom BCM470X /
>>> BCM5301X ARM SoCs.
>>> The driver found in the Broadcom SDK does some more stuff, like setting
>>> up some DMA memory areas, chaining MPS and MRRS to 512 and also some
>>> PHY changes like "improving" the PCIe jitter and doing some special
>>> initializations for the 3rd PCIe port.
>>> This was tested on a bcm4708 board with 2 PCIe ports and wireless cards
>>> connected to them.
>>> PCI_DOMAINS is needed by this driver, because normally there is more
>>> than one PCIe controller and without PCI_DOMAINS only the first
>>> controller gets registered.
>>> This controller gets 6 IRQs, the last one is trigged by all IRQ events.
>>> Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
>> Acked-by: Rafał Miłecki <zajec5 at gmail.com>
>>> +static int iproc_pcie_bcma_probe(struct bcma_device *bdev)
>>> + struct iproc_pcie *pcie;
>>> + LIST_HEAD(res);
>>> + struct resource res_mem;
>>> + int ret;
>>> + pcie = devm_kzalloc(&bdev->dev, sizeof(*pcie), GFP_KERNEL);
>>> + if (!pcie)
>>> + return -ENOMEM;
>>> + pcie->dev = &bdev->dev;
>>> + bcma_set_drvdata(bdev, pcie);
>>> + pcie->base = bdev->io_addr;
>>> + res_mem.start = bdev->addr_s;
>>> + res_mem.end = bdev->addr_s + SZ_128M - 1;
>>> + res_mem.name = "PCIe MEM space";
>>> + res_mem.flags = IORESOURCE_MEM;
>>> + pci_add_resource(&res, &res_mem);
>>> + pcie->resources = &res;
>>> + pcie->map_irq = iproc_pcie_bcma_map_irq;
>>> + ret = iproc_pcie_setup(pcie);
>> I think I don't like this part of iproc design. It lefts
>> pcie->resources pointing to some random memory after the setup/probe
>> are done. Guess it should be a separated parameter or sth.
>> The patch is still OK, I just refer to generic iproc possible issue.
> Sorry Rafal, but could you please be more specific on this?
iproc_pcie_pltfm_probe (and iproc_pcie_bcma_probe) have local "res"
variable (each its own). They do:
pcie->resources = &res;
and then they call
After iproc_pcie_pltfm_probe / iproc_pcie_bcma_probe returns, the
pointer pcie->resources is not valid anymore, yet pcie struct is still
in use. Of course pcie->resources isn't used anymore, but still, it's
some in-struct pointer (to the random memory since local variable is
not accessible anymore).
I think you should drop
struct list_head *resources;
from the struct iproc_pcie and use
iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *resources)
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