[PATCH] soc: qcom: pmic_glink: Avoid losing early rpmsg probe

[Konrad Dybcio]

From: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>

The PMIC GLINK rpmsg device can appear before the platform device has
finished probing. In that case pmic_glink_rpmsg_probe() sees
__pmic_glink as NULL and returns -ENODEV, which is treated as a fatal
probe failure for the rpmsg endpoint.

If this race is hit, pg->ept is never installed and PMIC GLINK clients
never receive the service-up notification. This may leave the system
with no Type-C functionality and without battery/power supply
management.

Return -EPROBE_DEFER when the rpmsg endpoint arrives before the platform
device is ready.

Fixes: 58ef4ece1e41 ("soc: qcom: pmic_glink: Introduce base PMIC GLINK driver")
Assisted-by: Codex:GPT-5.5
Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
---
 drivers/soc/qcom/pmic_glink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/pmic_glink.c b/drivers/soc/qcom/pmic_glink.c
index 3042261578aa..84fd0c82c0c4 100644
--- a/drivers/soc/qcom/pmic_glink.c
+++ b/drivers/soc/qcom/pmic_glink.c
@@ -250,7 +250,8 @@ static int pmic_glink_rpmsg_probe(struct rpmsg_device *rpdev)
 	guard(mutex)(&__pmic_glink_lock);
 	pg = __pmic_glink;
 	if (!pg)
-		return dev_err_probe(&rpdev->dev, -ENODEV, "no pmic_glink device to attach to\n");
+		return dev_err_probe(&rpdev->dev, -EPROBE_DEFER,
+				     "no pmic_glink device to attach to\n");
 
 	dev_set_drvdata(&rpdev->dev, pg);
 	pg->pdr_available = rpdev->id.driver_data;

---
base-commit: 0718283ab28bc3907e10b61a6b4be6fefa1cbb2f
change-id: 20260720-topic-pmic_glink_defer-34600458ecc7

Best regards,
--  
Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>