Since user could change default domain type of an iommu group through
sysfs, reading the default domain type now requires taking the lock first.
Cc: Christoph Hellwig <h...@lst.de>
Cc: Joerg Roedel <j...@8bytes.org>
Cc: Ashok Raj <ashok....@intel.com>
Cc: Will Deacon <will.dea...@arm.com>
Cc: Lu Baolu <baolu...@linux.intel.com>
Cc: Sohil Mehta <sohil.me...@intel.com>
Cc: Robin Murphy <robin.mur...@arm.com>
Cc: Jacob Pan <jacob.jun....@linux.intel.com>
Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prak...@intel.com>
---
drivers/iommu/iommu.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 56a29076871f..10e14cb9c32b 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -424,6 +424,7 @@ static ssize_t iommu_group_show_type(struct iommu_group
*group,
{
char *type = "unknown\n";
+ mutex_lock(&group->mutex);
if (group->default_domain) {
switch (group->default_domain->type) {
case IOMMU_DOMAIN_BLOCKED:
@@ -440,6 +441,7 @@ static ssize_t iommu_group_show_type(struct iommu_group
*group,
break;
}
}
+ mutex_unlock(&group->mutex);
strcpy(buf, type);
return strlen(type);
--
2.7.4
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