From: Jie Gan <jie.gan@oss.qualcomm.com>
Date: Thu, 19 Feb 2026 14:46:57 +0000 (+0800)
Subject: coresight: ctcu: fix the spin_bug
X-Git-Tag: v7.1-rc1~17^2^2~15
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=36ffbbc2b387bc5320e9caa90c0313743b87ba51;p=thirdparty%2Fkernel%2Flinux.git

coresight: ctcu: fix the spin_bug

Acquiring an uninitialized raw_spin_lock is invalid and may trigger
unexpected behavior or spin_bug.

Fixes: f78d206f3d73 ("Coresight: Add Coresight TMC Control Unit driver")
Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260219-fix-spin-lock-issue-v1-1-557f7d513d7e@oss.qualcomm.com
---

diff --git a/drivers/hwtracing/coresight/coresight-ctcu-core.c b/drivers/hwtracing/coresight/coresight-ctcu-core.c
index 6813ae6e929b..9043cad42f01 100644
--- a/drivers/hwtracing/coresight/coresight-ctcu-core.c
+++ b/drivers/hwtracing/coresight/coresight-ctcu-core.c
@@ -226,6 +226,7 @@ static int ctcu_probe(struct platform_device *pdev)
 	desc.dev = dev;
 	desc.ops = &ctcu_ops;
 	desc.access = CSDEV_ACCESS_IOMEM(base);
+	raw_spin_lock_init(&drvdata->spin_lock);
 
 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev))