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Subject[PATCH 2/2] iommu/amd: Fix crash when accessing AMD-Vi sysfs entries
Date
From: Joerg Roedel <jroedel@suse.de>

The link between the iommu sysfs-device and the struct
amd_iommu is no longer stored as driver-data. Update the
code to the new correct way of getting from device to
amd_iommu.

Reported-by: Dave Jones <davej@codemonkey.org.uk>
Fixes: 39ab9555c241 ('iommu: Add sysfs bindings for struct iommu_device')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/amd_iommu_init.c | 4 ++--
drivers/iommu/amd_iommu_types.h | 5 +++++
2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 04cdac7..6130278 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1507,7 +1507,7 @@ static ssize_t amd_iommu_show_cap(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct amd_iommu *iommu = dev_get_drvdata(dev);
+ struct amd_iommu *iommu = dev_to_amd_iommu(dev);
return sprintf(buf, "%x\n", iommu->cap);
}
static DEVICE_ATTR(cap, S_IRUGO, amd_iommu_show_cap, NULL);
@@ -1516,7 +1516,7 @@ static ssize_t amd_iommu_show_features(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct amd_iommu *iommu = dev_get_drvdata(dev);
+ struct amd_iommu *iommu = dev_to_amd_iommu(dev);
return sprintf(buf, "%llx\n", iommu->features);
}
static DEVICE_ATTR(features, S_IRUGO, amd_iommu_show_features, NULL);
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index af00f38..003f3ce 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -569,6 +569,11 @@ struct amd_iommu {
volatile u64 __aligned(8) cmd_sem;
};

+static inline struct amd_iommu *dev_to_amd_iommu(struct device *dev)
+{
+ return container_of(dev, struct amd_iommu, iommu.dev);
+}
+
#define ACPIHID_UID_LEN 256
#define ACPIHID_HID_LEN 9

--
1.9.1
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