From: Hans Zhang <18255117159@163.com> Date: Sat, 19 Apr 2025 13:30:58 +0000 (+0800) Subject: PCI: cadence: Fix runtime atomic count underflow X-Git-Tag: v5.10.239~268 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a5ce63432148f0beba282664ba08b96cf6e8b7d9;p=thirdparty%2Fkernel%2Fstable.git 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 Link: https://patch.msgid.link/20250419133058.162048-1-18255117159@163.com Signed-off-by: Sasha Levin --- diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c index 4d8d15ac51ef4..c29176bdecd19 100644 --- 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); }