On Fri, Jan 13, 2017 at 02:58:41AM +0300, Abylay Ospan wrote:
> Resource allocated on stack was saved by 'devm_request_resource' to
> global 'iomem_resource' but become invalid after 'iproc_pcie_bcma_probe' exit.
> So the global 'iomem_resource' was poisoned. This may cause kernel crash
> or second PCIe bridge registration failure.
>
> Tested on Broadcom NorthStar machine ('Edgecore ECW7220-L') with two PCIe wifi
> adapters (b43 BCM4331 and ath10k QCA988X).
>
> Signed-off-by: Abylay Ospan <aospan@xxxxxxxx>
Hi Abylay, there was some follow-up discussion and I couldn't tell
what the ultimate resolution was. Please repost this with any acks
you have if this is still necessary.
> ---
> drivers/pci/host/pcie-iproc-bcma.c | 18 ++++++++----------
> drivers/pci/host/pcie-iproc.h | 2 ++
> 2 files changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/pci/host/pcie-iproc-bcma.c b/drivers/pci/host/pcie-iproc-bcma.c
> index bd4c9ec..28f9b89 100644
> --- a/drivers/pci/host/pcie-iproc-bcma.c
> +++ b/drivers/pci/host/pcie-iproc-bcma.c
> @@ -44,8 +44,6 @@ static int iproc_pcie_bcma_probe(struct bcma_device *bdev)
> {
> struct device *dev = &bdev->dev;
> struct iproc_pcie *pcie;
> - LIST_HEAD(res);
> - struct resource res_mem;
> int ret;
>
> pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
> @@ -62,21 +60,21 @@ static int iproc_pcie_bcma_probe(struct bcma_device *bdev)
> }
>
> pcie->base_addr = bdev->addr;
> + INIT_LIST_HEAD(&pcie->resources);
>
> - res_mem.start = bdev->addr_s[0];
> - res_mem.end = bdev->addr_s[0] + SZ_128M - 1;
> - res_mem.name = "PCIe MEM space";
> - res_mem.flags = IORESOURCE_MEM;
> - pci_add_resource(&res, &res_mem);
> + pcie->res_mem.start = bdev->addr_s[0];
> + pcie->res_mem.end = bdev->addr_s[0] + SZ_128M - 1;
> + pcie->res_mem.name = "PCIe MEM space";
> + pcie->res_mem.flags = IORESOURCE_MEM;
> + pcie->res_mem.child = NULL;
> + pci_add_resource(&pcie->resources, &pcie->res_mem);
>
> pcie->map_irq = iproc_pcie_bcma_map_irq;
>
> - ret = iproc_pcie_setup(pcie, &res);
> + ret = iproc_pcie_setup(pcie, &pcie->resources);
> if (ret)
> dev_err(dev, "PCIe controller setup failed\n");
>
> - pci_free_resource_list(&res);
> -
> bcma_set_drvdata(bdev, pcie);
> return ret;
> }
> diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
> index 04fed8e..866d649 100644
> --- a/drivers/pci/host/pcie-iproc.h
> +++ b/drivers/pci/host/pcie-iproc.h
> @@ -105,6 +105,8 @@ struct iproc_pcie {
>
> bool need_msi_steer;
> struct iproc_msi *msi;
> + struct resource res_mem;
> + struct list_head resources;
> };
>
> int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res);
> --
> 2.7.4
>
>
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