ARC: perf: avoid kernel killing where it is possible

No, not gonna die tonight.

Signed-off-by: Eugeniy Paltsev <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>

diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index 248c7b61690a913954aa8fda64f39f58ee7dd74c..861a8aea51f9fe0c086665dd84677f7ee80ea838 100644 (file)
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -580,10 +580,12 @@ static int arc_pmu_device_probe(struct platform_device *pdev)
                return -ENODEV;
        }
        BUILD_BUG_ON(ARC_PERF_MAX_COUNTERS > 32);
-       BUG_ON(pct_bcr.c > ARC_PERF_MAX_COUNTERS);
+       if (WARN_ON(pct_bcr.c > ARC_PERF_MAX_COUNTERS))
+               return -EINVAL;
 
        READ_BCR(ARC_REG_CC_BUILD, cc_bcr);
-       BUG_ON(!cc_bcr.v); /* Counters exist but No countable conditions ? */
+       if (WARN(!cc_bcr.v, "Counters exist but No countable conditions?"))
+               return -EINVAL;
 
        arc_pmu = devm_kzalloc(&pdev->dev, sizeof(struct arc_pmu), GFP_KERNEL);
        if (!arc_pmu)