[PATCH] iommu: Fix unwind goto issue

[Heiko Stübner]

Am Montag, 17. April 2023, 05:04:21 CEST schrieb Chao Wang:
> 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 at hust.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91 at hust.edu.cn>

Looking at the code, that makes a lot of sense.

Reviewed-by: Heiko Stuebner <heiko at sntech.de>