| Message ID | 20210408072700.15791-1-dinghao.liu@zju.edu.cn |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: tegra: Fix runtime PM imbalance in pex_ep_event_pex_rst_deassert | expand |
On 08/04/2021 08:26, Dinghao Liu wrote: > pm_runtime_get_sync() will increase the runtime PM counter > even it returns an error. Thus a pairing decrement is needed > to prevent refcount leak. Fix this by replacing this API with > pm_runtime_resume_and_get(), which will not change the runtime > PM counter on error. > > Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> > --- > drivers/pci/controller/dwc/pcie-tegra194.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c > index 6fa216e52d14..0e94190ca4e8 100644 > --- a/drivers/pci/controller/dwc/pcie-tegra194.c > +++ b/drivers/pci/controller/dwc/pcie-tegra194.c > @@ -1645,7 +1645,7 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie) > if (pcie->ep_state == EP_STATE_ENABLED) > return; > > - ret = pm_runtime_get_sync(dev); > + ret = pm_runtime_resume_and_get(dev); > if (ret < 0) { > dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n", > ret); > There are two places in the driver where pm_runtime_get_sync() is called. Thanks Jon
On Thu, Apr 08, 2021 at 01:34:37PM +0100, Jon Hunter wrote: > > On 08/04/2021 08:26, Dinghao Liu wrote: > > pm_runtime_get_sync() will increase the runtime PM counter > > even it returns an error. Thus a pairing decrement is needed > > to prevent refcount leak. Fix this by replacing this API with > > pm_runtime_resume_and_get(), which will not change the runtime > > PM counter on error. > > > > Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> > > --- > > drivers/pci/controller/dwc/pcie-tegra194.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c > > index 6fa216e52d14..0e94190ca4e8 100644 > > --- a/drivers/pci/controller/dwc/pcie-tegra194.c > > +++ b/drivers/pci/controller/dwc/pcie-tegra194.c > > @@ -1645,7 +1645,7 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie) > > if (pcie->ep_state == EP_STATE_ENABLED) > > return; > > > > - ret = pm_runtime_get_sync(dev); > > + ret = pm_runtime_resume_and_get(dev); > > if (ret < 0) { > > dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n", > > ret); > > > > There are two places in the driver where pm_runtime_get_sync() is called. It looks like the second callsite has the proper cleanup code. Although it might be nice to use pm_runtime_resume_and_get() there as well, and adjust the cleanup path, to make this consistent. In any case, this looks good to me: Acked-by: Thierry Reding <treding@nvidia.com>
On Thu, 8 Apr 2021 15:26:58 +0800, Dinghao Liu wrote: > pm_runtime_get_sync() will increase the runtime PM counter > even it returns an error. Thus a pairing decrement is needed > to prevent refcount leak. Fix this by replacing this API with > pm_runtime_resume_and_get(), which will not change the runtime > PM counter on error. Applied to pci/tegra, thanks! [1/1] PCI: tegra: Fix runtime PM imbalance in pex_ep_event_pex_rst_deassert https://git.kernel.org/lpieralisi/pci/c/571cdd5294 Thanks, Lorenzo
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 6fa216e52d14..0e94190ca4e8 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1645,7 +1645,7 @@ static void pex_ep_event_pex_rst_deassert(struct tegra_pcie_dw *pcie) if (pcie->ep_state == EP_STATE_ENABLED) return; - ret = pm_runtime_get_sync(dev); + ret = pm_runtime_resume_and_get(dev); if (ret < 0) { dev_err(dev, "Failed to get runtime sync for PCIe dev: %d\n", ret);
pm_runtime_get_sync() will increase the runtime PM counter even it returns an error. Thus a pairing decrement is needed to prevent refcount leak. Fix this by replacing this API with pm_runtime_resume_and_get(), which will not change the runtime PM counter on error. Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> --- drivers/pci/controller/dwc/pcie-tegra194.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)