6.6-stable review patch. If anyone has any objections, please let me know.
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From: Hans Zhang 18255117159@163.com
[ 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 --- drivers/pci/controller/cadence/pcie-cadence-host.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-)
diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c index 8af95e9da7cec..741e10a575ec7 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-host.c +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c @@ -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); }