[PATCH] iommu/exynos: Initialize lock before requesting IRQ

[Runyu Xiao]

The SysMMU interrupt handler can run as soon as devm_request_irq() is
called. Initialize the driver lock before registering the handler so an
early interrupt cannot use an uninitialized lock.

Fixes: 2a96536e77b4 ("iommu/exynos: Add iommu driver for EXYNOS Platforms")
Cc: stable at vger.kernel.org
Signed-off-by: Runyu Xiao <runyu.xiao at seu.edu.cn>
Assisted-by: Codex:GPT-5
---
 drivers/iommu/exynos-iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 874d05f4b..e9feb83b3 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -735,6 +735,8 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
+	spin_lock_init(&data->lock);
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	data->sfrbase = devm_ioremap_resource(dev, res);
 	if (IS_ERR(data->sfrbase))
@@ -773,7 +775,6 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
 		return PTR_ERR(data->clk_master);
 
 	data->sysmmu = dev;
-	spin_lock_init(&data->lock);
 
 	__sysmmu_get_version(data);
 
-- 
2.34.1