evie/android_kernel_oneplus_msm8998
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drm/msm: implement smmu detach and guard freeing of client dev

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Provide a basic implementation of msm_smmu_detach. Check
that smmu client_dev exists before doing
platform_device_unregister.

Change-Id: Ied1481003d878af452d3b00b950b234c6b7dd698
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>
This commit is contained in:
Lloyd Atkinson 2016-10-04 09:51:22 -04:00 • committed by Gerrit - the friendly Code Review server
parent f547c0a044
commit b1b6408bcf
1 changed files with 16 additions and 2 deletions
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18
drivers/gpu/drm/msm/msm_smmu.c
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@ -82,7 +82,20 @@ static int msm_smmu_attach(struct msm_mmu *mmu, const char **names, int cnt)
static void msm_smmu_detach(struct msm_mmu *mmu, const char **names, int cnt)
{
DBG("detaching");
struct msm_smmu *smmu = to_msm_smmu(mmu);
struct msm_smmu_client *client = msm_smmu_to_client(smmu);
if (!client) {
pr_err("undefined smmu client\n");
return;
}
if (!client->domain_attached)
return;
arm_iommu_detach_device(client->dev);
client->domain_attached = false;
dev_dbg(client->dev, "iommu domain detached\n");
}
static int msm_smmu_map(struct msm_mmu *mmu, uint32_t iova,
@ -193,7 +206,8 @@ static void msm_smmu_destroy(struct msm_mmu *mmu)
struct msm_smmu *smmu = to_msm_smmu(mmu);
struct platform_device *pdev = to_platform_device(smmu->client_dev);
platform_device_unregister(pdev);
if (smmu->client_dev)
platform_device_unregister(pdev);
kfree(smmu);
}