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SubjectRe: [PATCH v4 04/13] iommu/rockchip: Fix error handling in attach
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On 18/01/18 11:52, Jeffy Chen wrote:
> From: Tomasz Figa <tfiga@chromium.org>
>
> Currently if the driver encounters an error while attaching device, it
> will leave the IOMMU in an inconsistent state. Even though it shouldn't
> really happen in reality, let's just add proper error path to keep
> things consistent.
>
> Signed-off-by: Tomasz Figa <tfiga@chromium.org>
> Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
> ---
>
> Changes in v4: None
> Changes in v3: None
> Changes in v2:
> Move irq request to probe(in patch[0])
>
> drivers/iommu/rockchip-iommu.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index b743d82e6fe1..37065a7127c9 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
> @@ -824,7 +824,7 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
>
> ret = rk_iommu_force_reset(iommu);
> if (ret)
> - return ret;
> + goto err_disable_stall;
>
> iommu->domain = domain;
>
> @@ -837,7 +837,7 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
>
> ret = rk_iommu_enable_paging(iommu);
> if (ret)
> - return ret;
> + goto err_disable_stall;
>
> spin_lock_irqsave(&rk_domain->iommus_lock, flags);
> list_add_tail(&iommu->node, &rk_domain->iommus);
> @@ -848,6 +848,11 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
> rk_iommu_disable_stall(iommu);
>
> return 0;

Nit: if you like, it looks reasonable to name the label
"out_disable_stall" and remove these lines above here, to save the
duplication between the error and success paths (since ret will already
be 0 on the latter).

Either way,

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

> +
> +err_disable_stall:
> + rk_iommu_disable_stall(iommu);
> +
> + return ret;
> }
>
> static void rk_iommu_detach_device(struct iommu_domain *domain,
>

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