PCI: cadence: Fix runtime atomic count underflow

[ Upstream commit 8805f32a96d3b97cef07999fa6f52112678f7e65 ]

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: 49e427e6bdd1 ("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>

diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
index 4d8d15ac51ef4a08ec387443e8a5789396dd9c8a..c29176bdecd19e39db865a120031514e2104dc99 100644 (file)
--- a/drivers/pci/controller/cadence/pcie-cadence-host.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
@@ -548,14 +548,5 @@ 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);
 }