[PATCH 3/4] perf: nvidia_t410_c2c: fix cpuhp state leak on init failure

[Saurav Sachidanand]

If platform_driver_register() fails, the cpuhp multi-state registered
by cpuhp_setup_state_multi() is never cleaned up. Add
cpuhp_remove_multi_state() on the error path, mirroring the cleanup
in nv_c2c_pmu_exit().

Fixes: 2f89b7f78c50 ("perf: add NVIDIA Tegra410 C2C PMU")
Signed-off-by: Saurav Sachidanand <sauravsc at amazon.com>
---
 drivers/perf/nvidia_t410_c2c_pmu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/perf/nvidia_t410_c2c_pmu.c b/drivers/perf/nvidia_t410_c2c_pmu.c
index 411987153ff3f..662fa1bc833a5 100644
--- a/drivers/perf/nvidia_t410_c2c_pmu.c
+++ b/drivers/perf/nvidia_t410_c2c_pmu.c
@@ -1034,7 +1034,12 @@ static int __init nv_c2c_pmu_init(void)
 		return ret;
 
 	nv_c2c_pmu_cpuhp_state = ret;
-	return platform_driver_register(&nv_c2c_pmu_driver);
+
+	ret = platform_driver_register(&nv_c2c_pmu_driver);
+	if (ret)
+		cpuhp_remove_multi_state(nv_c2c_pmu_cpuhp_state);
+
+	return ret;
 }
 
 static void __exit nv_c2c_pmu_exit(void)
-- 
2.47.3