[PATCH v2] PCI: starfive: Fix unchecked pm_runtime_get_sync() in probe

[Ali Tariq <alitariq45892@gmail.com>]

pm_runtime_get_sync() is called in starfive_pcie_probe() without
checking its return value. If runtime resume fails, the driver
proceeds to configure PCIe hardware through regmap_update_bits(),
enable clocks and resets, and power on the PHY, even though the
device may not actually be powered.

pm_runtime_get_sync() also increments the usage counter even when
resume fails, which would leave the counter unbalanced if this
error path were later handled without additional cleanup.

Switch to pm_runtime_resume_and_get(), which balances the usage
counter internally on failure, and bail out of probe before any
hardware is touched if resume does not succeed.

Tested on StarFive VisionFive 2 v1.2A board.

Fixes: 6168efbebace ("PCI: starfive: Enable controller runtime PM before probing host bridge")
Signed-off-by: Ali Tariq <alitariq45892@gmail.com>
---
Changes in v2:
- Added Fixes tag to commit message
---
 drivers/pci/controller/plda/pcie-starfive.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/plda/pcie-starfive.c b/drivers/pci/controller/plda/pcie-starfive.c
index 298036c3e7f9..e9a472985b8a 100644
--- a/drivers/pci/controller/plda/pcie-starfive.c
+++ b/drivers/pci/controller/plda/pcie-starfive.c
@@ -410,7 +410,11 @@ static int starfive_pcie_probe(struct platform_device *pdev)
 		return ret;
 
 	pm_runtime_enable(&pdev->dev);
-	pm_runtime_get_sync(&pdev->dev);
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret < 0) {
+		pm_runtime_disable(&pdev->dev);
+		return dev_err_probe(dev, ret, "failed to resume device\n");
+	}
 
 	plda->host_ops = &sf_host_ops;
 	plda->num_events = PLDA_MAX_EVENT_NUM;
-- 
2.34.1