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PCI: cadence: Fix runtime atomic count underflow

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[ Upstream commit 8805f32a96 ]

If the call to pci_host_probe() in cdns_pcie_host_setup() fails, PM
runtime count is decremented in the error path using pm_runtime_put_sync().
But the runtime count is not incremented by this driver, but only by the
callers (cdns_plat_pcie_probe/j721e_pcie_probe). And the callers also
decrement the runtime PM count in their error path. So this leads to the
below warning from the PM core:

	"runtime PM usage count underflow!"

So fix it by getting rid of pm_runtime_put_sync() in the error path and
directly return the errno.

Fixes: 49e427e6bd ("Merge branch 'pci/host-probe-refactor'")
Signed-off-by: Hans Zhang <18255117159@163.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://patch.msgid.link/20250419133058.162048-1-18255117159@163.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hans Zhang
2025-04-19 21:30:58 +08:00
committed by Greg Kroah-Hartman
parent 92d879eff4
commit 004316d2de
1 changed files with 1 additions and 10 deletions
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drivers/pci/controller/cadence/pcie-cadence-host.c
+1 -10
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@@ -570,14 +570,5 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
if (!bridge->ops)
bridge->ops = &cdns_pcie_host_ops;
ret = pci_host_probe(bridge);
if (ret < 0)
goto err_init;
return 0;
err_init:
pm_runtime_put_sync(dev);
return ret;
return pci_host_probe(bridge);
}