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authorDonald Dutile <ddutile@redhat.com>2009-08-20 16:51:34 -0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-08-24 08:56:26 +0100
commit94a91b5051a77d8a71d4f11a3240f0d9c51b6cf2 (patch)
tree04d81ea79520cbd662024ee23cd3f834dd950ed0 /drivers/pci
parent071e13746f9ebb259987c71ea77f11e7656769a2 (diff)
downloadop-kernel-dev-94a91b5051a77d8a71d4f11a3240f0d9c51b6cf2.zip
op-kernel-dev-94a91b5051a77d8a71d4f11a3240f0d9c51b6cf2.tar.gz
intel-iommu: iommu init error path bug fixes
The kcalloc() failure path in iommu_init_domains() calls free_dmar_iommu(), which assumes that ->domains, ->domain_ids, and ->lock have been properly initialized. Add checks in free_[dmar]_iommu to not use ->domains,->domain_ids if not alloced. Move the lock init to prior to the kcalloc()'s, so it is valid in free_context_table() when free_dmar_iommu() invokes it at the end. Patch based on iommu-2.6, commit 132032274a594ee9ffb6b9c9e2e9698149a09ea9 Signed-off-by: Donald Dutile <ddutile@redhat.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/intel-iommu.c35
1 files changed, 18 insertions, 17 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index e67335b..beb5ccf 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1158,6 +1158,8 @@ static int iommu_init_domains(struct intel_iommu *iommu)
pr_debug("Number of Domains supportd <%ld>\n", ndomains);
nlongs = BITS_TO_LONGS(ndomains);
+ spin_lock_init(&iommu->lock);
+
/* TBD: there might be 64K domains,
* consider other allocation for future chip
*/
@@ -1170,12 +1172,9 @@ static int iommu_init_domains(struct intel_iommu *iommu)
GFP_KERNEL);
if (!iommu->domains) {
printk(KERN_ERR "Allocating domain array failed\n");
- kfree(iommu->domain_ids);
return -ENOMEM;
}
- spin_lock_init(&iommu->lock);
-
/*
* if Caching mode is set, then invalid translations are tagged
* with domainid 0. Hence we need to pre-allocate it.
@@ -1195,22 +1194,24 @@ void free_dmar_iommu(struct intel_iommu *iommu)
int i;
unsigned long flags;
- i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap));
- for (; i < cap_ndoms(iommu->cap); ) {
- domain = iommu->domains[i];
- clear_bit(i, iommu->domain_ids);
+ if ((iommu->domains) && (iommu->domain_ids)) {
+ i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap));
+ for (; i < cap_ndoms(iommu->cap); ) {
+ domain = iommu->domains[i];
+ clear_bit(i, iommu->domain_ids);
+
+ spin_lock_irqsave(&domain->iommu_lock, flags);
+ if (--domain->iommu_count == 0) {
+ if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
+ vm_domain_exit(domain);
+ else
+ domain_exit(domain);
+ }
+ spin_unlock_irqrestore(&domain->iommu_lock, flags);
- spin_lock_irqsave(&domain->iommu_lock, flags);
- if (--domain->iommu_count == 0) {
- if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
- vm_domain_exit(domain);
- else
- domain_exit(domain);
+ i = find_next_bit(iommu->domain_ids,
+ cap_ndoms(iommu->cap), i+1);
}
- spin_unlock_irqrestore(&domain->iommu_lock, flags);
-
- i = find_next_bit(iommu->domain_ids,
- cap_ndoms(iommu->cap), i+1);
}
if (iommu->gcmd & DMA_GCMD_TE)
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