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| author | Dmitry Osipenko <digetx@gmail.com> | 2018-12-12 23:39:00 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-01-16 15:54:14 +0300 |
| commit | c3086fad2755f5e446f6a69fda3b2a8c16a1b5ce (patch) | |
| tree | f46ab299e77f013c02c003499d0e7a201ced7274 /drivers/iommu/tegra-gart.c | |
| parent | f2dcded1be0d024870b5a4ef8e4a587857f303b4 (diff) | |
| download | linux-c3086fad2755f5e446f6a69fda3b2a8c16a1b5ce.tar.xz | |
iommu/tegra: gart: Fix spinlock recursion
Fix spinlock recursion bug that happens on IOMMU domain destruction if
any of the allocated domains have devices attached to them.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/tegra-gart.c')
| -rw-r--r-- | drivers/iommu/tegra-gart.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c index b35ffa312a83..a7a9400e0cd8 100644 --- a/drivers/iommu/tegra-gart.c +++ b/drivers/iommu/tegra-gart.c @@ -197,25 +197,33 @@ fail: return err; } -static void gart_iommu_detach_dev(struct iommu_domain *domain, - struct device *dev) +static void __gart_iommu_detach_dev(struct iommu_domain *domain, + struct device *dev) { struct gart_domain *gart_domain = to_gart_domain(domain); struct gart_device *gart = gart_domain->gart; struct gart_client *c; - spin_lock(&gart->client_lock); - list_for_each_entry(c, &gart->client, list) { if (c->dev == dev) { list_del(&c->list); devm_kfree(gart->dev, c); dev_dbg(gart->dev, "Detached %s\n", dev_name(dev)); - goto out; + return; } } - dev_err(gart->dev, "Couldn't find\n"); -out: + + dev_err(gart->dev, "Couldn't find %s to detach\n", dev_name(dev)); +} + +static void gart_iommu_detach_dev(struct iommu_domain *domain, + struct device *dev) +{ + struct gart_domain *gart_domain = to_gart_domain(domain); + struct gart_device *gart = gart_domain->gart; + + spin_lock(&gart->client_lock); + __gart_iommu_detach_dev(domain, dev); spin_unlock(&gart->client_lock); } @@ -255,7 +263,7 @@ static void gart_iommu_domain_free(struct iommu_domain *domain) struct gart_client *c; list_for_each_entry(c, &gart->client, list) - gart_iommu_detach_dev(domain, c->dev); + __gart_iommu_detach_dev(domain, c->dev); } spin_unlock(&gart->client_lock); } |