[PATCH 6.18 184/227] slimbus: core: fix runtime PM imbalance on report present

Greg Kroah-Hartman
2026-01-28T16:00:22Z

From: Johan Hovold <johan@kernel.org>

commit 0eb4ff6596114aabba1070a66afa2c2f5593739f upstream.

Make sure to balance the runtime PM usage count in case slimbus device
or address allocation fails on report present, which would otherwise
prevent the controller from suspending.

Fixes: 4b14e62ad3c9 ("slimbus: Add support for 'clock-pause' feature")
Cc: stable@vger.kernel.org # 4.16
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20251126145329.5022-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/slimbus/core.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)

--- a/drivers/slimbus/core.c
+++ b/drivers/slimbus/core.c
@@ -489,21 +489,23 @@ int slim_device_report_present(struct sl
if (ctrl->sched.clk_state != SLIM_CLK_ACTIVE) {
dev_err(ctrl->dev, "slim ctrl not active,state:%d, ret:%d\n",
ctrl->sched.clk_state, ret);
- goto slimbus_not_active;
+ goto out_put_rpm;
}

sbdev = slim_get_device(ctrl, e_addr);
- if (IS_ERR(sbdev))
- return -ENODEV;
+ if (IS_ERR(sbdev)) {
+ ret = -ENODEV;
+ goto out_put_rpm;
+ }

if (sbdev->is_laddr_valid) {
*laddr = sbdev->laddr;
- return 0;
+ ret = 0;
+ } else {
+ ret = slim_device_alloc_laddr(sbdev, true);
}

- ret = slim_device_alloc_laddr(sbdev, true);
-
-slimbus_not_active:
+out_put_rpm:
pm_runtime_mark_last_busy(ctrl->dev);
pm_runtime_put_autosuspend(ctrl->dev);
return ret;