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SubjectRe: [PATCH] PCI: qcom: Fix error handling in pm_runtime support
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Hi Bjorn,

On 05/25/2018 10:09 PM, Bjorn Andersson wrote:
> The driver does not cope with the fact that probe can fail in a number
> of cases after enabling pm_runtime on the device, this results in
> warnings about "Unbalanced pm_runtime_enable". Further more if probe
> fails after invoking host_init the power-domain will be left referenced.
>
> As it's not possible for the error handling in qcom_pcie_host_init() to
> handle errors happening after returning from that function the
> pm_runtime_get_sync() is moved to probe() as well.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Please add:

Fixes: 854b69efbdd2903991506ac5d5624d2cfb5b4e2f PCI: qcom: add runtime
pm support to pcie_port

> ---
>
> I'm sorry for not spotting this last week when we discussed the previous patch.
>
> drivers/pci/dwc/pcie-qcom.c | 65 ++++++++++++++++++++++++++-----------

the path has been changed to drivers/pci/controller/dwc/pcie-qcom.c

> 1 file changed, 46 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c
> index 3f35098b71b1..f2453196278f 100644
> --- a/drivers/pci/dwc/pcie-qcom.c
> +++ b/drivers/pci/dwc/pcie-qcom.c
> @@ -1088,8 +1088,6 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
> struct qcom_pcie *pcie = to_qcom_pcie(pci);
> int ret;
>
> - pm_runtime_get_sync(pci->dev);
> -
> qcom_ep_reset_assert(pcie);
>
> ret = pcie->ops->init(pcie);
> @@ -1126,7 +1124,6 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
> phy_power_off(pcie->phy);
> err_deinit:
> pcie->ops->deinit(pcie);
> - pm_runtime_put_sync(pci->dev);
>
> return ret;
> }
> @@ -1207,7 +1204,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> struct qcom_pcie *pcie;
> int ret;
>
> -
> pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
> if (!pcie)
> return -ENOMEM;
> @@ -1217,6 +1213,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> return -ENOMEM;
>
> pm_runtime_enable(dev);
> + pm_runtime_get_sync(dev);

pm_runtime_get_sync could fail, please check for errors.

With those changes addressed:

Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>

--
regards,
Stan

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