[PATCH] coresight: trbe: Move check for kernelspace unmapped at EL0 to probe

[Sudeep Holla]

Currently with the check present in the module initialisation, it shouts
on all the systems irrespective of presence of coresight trace buffer
extensions.

Similar to Arm SPE perf driver, move the check for kernelspace unmapping
when running at EL0 to the device probe instead of module initialisation.

Cc: Mathieu Poirier <mathieu.poirier at linaro.org>
Cc: Suzuki K Poulose <suzuki.poulose at arm.com>
Cc: Mike Leach <mike.leach at linaro.org>
Cc: Leo Yan <leo.yan at linaro.org>
Cc: Anshuman Khandual <anshuman.khandual at arm.com>
Cc: coresight at lists.linaro.org
Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
---
 drivers/hwtracing/coresight/coresight-trbe.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index 276862c07e32..3fe2ce1ba5bf 100644
--- a/drivers/hwtracing/coresight/coresight-trbe.c
+++ b/drivers/hwtracing/coresight/coresight-trbe.c
@@ -1423,6 +1423,11 @@ static int arm_trbe_device_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	int ret;
 
+	if (arm64_kernel_unmapped_at_el0()) {
+		pr_err("TRBE wouldn't work if kernel gets unmapped at EL0\n");
+		return -EOPNOTSUPP;
+	}
+
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
@@ -1484,11 +1489,6 @@ static int __init arm_trbe_init(void)
 {
 	int ret;
 
-	if (arm64_kernel_unmapped_at_el0()) {
-		pr_err("TRBE wouldn't work if kernel gets unmapped at EL0\n");
-		return -EOPNOTSUPP;
-	}
-
 	ret = platform_driver_register(&arm_trbe_driver);
 	if (!ret)
 		return 0;
-- 
2.25.1