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Message-Id: <20230417030421.2777-1-D202280639@hust.edu.cn>
Date: Mon, 17 Apr 2023 03:04:21 +0000
From: Chao Wang <D202280639@...t.edu.cn>
To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Heiko Stuebner <heiko@...ech.de>,
Marc Zyngier <maz@...nel.org>, Olof Johansson <olof@...om.net>
Cc: hust-os-kernel-patches@...glegroups.com,
Chao Wang <D202280639@...t.edu.cn>,
Dongliang Mu <dzm91@...t.edu.cn>, iommu@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iommu: Fix unwind goto issue
Smatch complains that
drivers/iommu/rockchip-iommu.c:1306 rk_iommu_probe() warn: missing unwind goto?
The rk_iommu_probe function, after obtaining the irq value through
platform_get_irq, directly returns an error if the returned value
is negative, without releasing any resources.
Fix this by adding a new error handling label "err_pm_disable" and
use a goto statement to redirect to the error handling process. In
order to preserve the original semantics, set err to the value of irq.
Fixes: 1aa55ca9b14a ("iommu/rockchip: Move irq request past pm_runtime_enable")
Signed-off-by: Chao Wang <D202280639@...t.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>
---
This issue is found by static analysis and remains untested.
---
drivers/iommu/rockchip-iommu.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index f30db22ea5d7..31cd1e2929e9 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1302,20 +1302,22 @@ static int rk_iommu_probe(struct platform_device *pdev)
for (i = 0; i < iommu->num_irq; i++) {
int irq = platform_get_irq(pdev, i);
- if (irq < 0)
- return irq;
+ if (irq < 0) {
+ err = irq;
+ goto err_pm_disable;
+ }
err = devm_request_irq(iommu->dev, irq, rk_iommu_irq,
IRQF_SHARED, dev_name(dev), iommu);
- if (err) {
- pm_runtime_disable(dev);
- goto err_remove_sysfs;
- }
+ if (err)
+ goto err_pm_disable;
}
dma_set_mask_and_coherent(dev, rk_ops->dma_bit_mask);
return 0;
+err_pm_disable:
+ pm_runtime_disable(dev);
err_remove_sysfs:
iommu_device_sysfs_remove(&iommu->iommu);
err_put_group:
--
2.34.1
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